CN-121781604-B - Adjustable miniature pile-steel mesh cooperative support system

CN121781604BCN 121781604 BCN121781604 BCN 121781604BCN-121781604-B

Abstract

The invention relates to the technical field of geotechnical engineering support and discloses an adjustable micro pile-steel mesh cooperative support system. The system collects a contact stress spectrum by arranging a stress induction unit array on a miniature pile-soil interface, and monitors three-dimensional displacement by arranging a displacement tracking unit on a steel mesh node. And constructing a pile-net-soil interaction topological graph based on the spatial correlation of the stress spectrum and the displacement data. And carrying out real-time deduction on the topological graph by utilizing an interaction evolution algorithm, dynamically identifying a load transmission chain in the miniature pile group and an internal force distribution network of the steel mesh, and further fusing to generate an integral stressed framework of the cooperative supporting structure. And automatically generating miniature pile axial force adjustment and steel mesh prestress compensation instructions according to morphological characteristics of the stressed framework. The system realizes the dynamic sensing and intelligent cooperative adjustment of the evolution state of the internal force chain of the supporting structure, and improves the safety and self-adaptive capacity of the supporting system.

Inventors

ZHAO BIN
SHU JUN
YANG PENGBO
HE DAZHAO
LI JINGJING
ZHANG GUANGNING
YANG MING
LI PANHONG
RAN JINHUA
REN HONGWEI
LI GUN
WANG QINGFENG

Assignees

中国水利水电第九工程局有限公司

Dates

Publication Date: 20260508
Application Date: 20260304

Claims (10)

1. An adjustable micro pile-steel mesh cooperative support system, characterized in that the system comprises: The data acquisition module is used for arranging a plurality of stress induction units at the soil body interface between the pile body of the miniature pile of the supporting structure and the pile, wherein the stress induction units acquire clump of pile-soil contact stress spectrum in real time, a displacement tracking unit is arranged at the joint of the steel mesh and the miniature pile, and the displacement tracking unit is used for continuously monitoring the three-dimensional displacement of the joint; The interaction modeling module is used for constructing a pile-net-soil interaction topological graph based on the spatial correlation between the pile-soil contact stress spectrum and the node three-dimensional displacement; the stress network identification module is used for carrying out real-time deduction on the pile-net-soil interaction topological graph through an interaction evolution algorithm, and identifying a miniature pile load transmission chain and a steel mesh internal force distribution network; the cooperative framework generation module is used for fusing the miniature pile load transmission chain with a steel mesh internal force distribution network to form an integral stressed framework of the cooperative supporting structure; And the adjusting instruction generating module is used for automatically generating a miniature pile axial force adjusting instruction and a steel mesh prestress compensating instruction according to the morphological characteristics of the integral stressed framework.
2. The adjustable micro pile-steel mesh co-supporting system according to claim 1, wherein constructing a pile-mesh-soil interaction topology based on spatial correlation between the pile-soil contact stress spectrum and the node three-dimensional displacement amount comprises: extracting stress peaks and valleys of a plurality of time periods from a continuous pile-soil contact stress spectrum to form a stress time sequence feature vector; carrying out coordinate transformation on the three-dimensional displacement of the node, mapping the displacement track into a local coordinate system taking a support surface as a reference, and generating a node displacement track sequence; calculating correlation coefficients between stress time sequence feature vectors corresponding to each stress sensing unit and node displacement track sequences generated by three displacement tracking units with the nearest space distance; The stress sensing unit and the displacement tracking unit are used as topological nodes, the correlation coefficient is used as the weight of a topological edge, and an initial weighted topological network comprising the nodes, the edges and the weight is established; Introducing continuity constraint of soil medium into the initial weighted topological network, wherein the continuity constraint requires that weight change of topological edges spatially satisfy continuous distribution; and performing skeleton extraction on the initial weighted topological network meeting the continuity constraint to obtain a simplified topological structure reflecting the main force transmission path among the pile body, the steel mesh and the soil body, wherein the simplified topological structure is the pile-mesh-soil interaction topological graph.
3. The adjustable micro pile-steel mesh collaborative support system according to claim 2, wherein the pile-mesh-soil interaction topological graph is deduced in real time by an interaction evolution algorithm, and a micro pile load transfer chain and steel mesh internal force distribution network are identified, comprising: Assigning an initial state value to each topological node in the pile-net-soil interaction topological graph, wherein the initial state value is obtained after normalization based on the real-time physical quantity acquired by the corresponding sensing unit; defining a state evolution rule of the topological nodes, wherein the state evolution rule prescribes that the state value of any topological node at the next moment is jointly determined by the current state value of the topological node, the weights of all topological edges connected with the topological node and the current state values of adjacent topological nodes; Inputting the pile-net-soil interaction topological graph and the state evolution rule into a preset parallel computing unit, and executing state iterative computation for multiple rounds until the state value change rate of all topological nodes is smaller than a preset threshold value, so as to obtain a stable node state distribution field; extracting a communication node sequence with a state value increasing along a specific direction from a stable node state distribution field, wherein the communication node sequence forms the miniature pile load transmission chain; In the pile-net-soil interaction topological graph, all topological nodes representing steel net connection nodes are screened out, the state gradient of the topological nodes after the state is stable is calculated, and the network is formed by connection according to the strong-weak relation of the state gradient, namely the steel net internal force distribution network.
4. The adjustable micro pile-steel mesh cooperative support system according to claim 3, wherein the micro pile load transmission chain and the steel mesh internal force distribution network are fused to form an integral stressed framework of the cooperative support structure, comprising: Establishing a unified spatial index, and mapping a node sequence in the miniature pile load transmission chain and a node in the steel mesh internal force distribution network into the same three-dimensional support structure model; identifying nodes, which are overlapped with each other or have a spatial distance smaller than a tolerance threshold, in the miniature pile load transmission chain and the steel mesh internal force distribution network, and marking the nodes as fusion nodes; For each fusion node, carrying out weighted synthesis on the state value borne by the fusion node in the load transmission chain and the state value borne by the fusion node in the internal force distribution network to generate a comprehensive state value of the fusion node, wherein the weighting coefficient is determined by the topological importance of the fusion node in the two force transmission paths; the fusion node is used as a hinge, the rest part of the miniature pile load transmission chain and the rest part of the force distribution network in the steel mesh are spliced again, and the continuity of a force transmission path is ensured; and (3) redundant path pruning is carried out on the network structure after the re-splicing, edges and nodes which have lower contribution to the whole force transmission than the preset proportion are removed, and the finally formed simplified three-dimensional network structure is the whole stressed framework.
5. The adjustable micro pile-steel mesh collaborative support system according to claim 4, wherein establishing a unified spatial index maps a sequence of nodes in the micro pile load transfer chain and nodes in the steel mesh internal force distribution network into a same three-dimensional support structure model, comprising: Acquiring a pre-constructed three-dimensional support structure digital model, wherein the three-dimensional support structure digital model comprises space coordinates of all miniature pile bodies, the geometric shape of a steel mesh panel and the accurate position of a connecting node; distributing three-dimensional coordinate identifiers to each node in the miniature pile load transmission chain, wherein the three-dimensional coordinate identifiers are determined through the installation positions of the corresponding stress induction units in the supporting structure; Distributing three-dimensional coordinate identifiers to each node in the force distribution network in the steel mesh, wherein the three-dimensional coordinate identifiers are determined through the installation positions of the corresponding displacement tracking units in the supporting structure; Establishing a three-dimensional space grid index taking the bottom surface of the supporting structure as a reference plane, and dividing the whole supporting structure space into a plurality of regular cube units; Respectively calculating the number of a regular cube unit to which each node in the miniature pile load transmission chain belongs from the three-dimensional coordinate identifier of each node in the force distribution network in the steel mesh; and associating the nodes from different networks belonging to the same regular cube unit number, recording the original network attribution information of the nodes, and finishing the mapping of the nodes to the same three-dimensional support structure model.
6. The adjustable micro pile-steel mesh cooperative support system according to claim 1, wherein the automatic generation of the micro pile axial force adjustment command and the steel mesh prestress compensation command according to the morphological characteristics of the overall stressed framework comprises: Analyzing the state values of all sides in the whole stressed skeleton, and marking the sides passing by which the state values exceed the corresponding threshold value of the allowable stress of the material as overload sides; Backtracking an upstream node and a downstream node connected with the overload edge, and positioning a key force transmission path containing the overload edge in the whole stress skeleton; calculating the state value unbalance of each node on the key force transmission path, and identifying weak nodes with state values obviously lower than those of adjacent nodes; Aiming at a key force transmission path comprising an overload edge, generating an adjustment instruction, wherein the adjustment instruction comprises the steps of reducing the output force value of a miniature pile driving device at the upstream of the key force transmission path or inserting a new miniature pile into the key force transmission path to share the load; And generating a compensation instruction aiming at the identified weak node, wherein the compensation instruction comprises the step of applying additional prestress to the steel mesh node corresponding to the weak node or enhancing the connection rigidity of the steel mesh and the micro pile at the weak node.
7. The adjustable micro pile-steel mesh co-supporting system according to claim 6, wherein backtracking the upstream and downstream nodes connected by the overload edge locates a critical force transmission path including the overload edge in the overall stressed framework, comprising: Taking two end nodes of each overload edge as starting points, and performing depth-first traversal on the upstream and downstream along the topological structure of the whole stressed framework respectively; Tracking the decreasing direction of the state value until encountering a node or boundary node with the state value being a local minimum value, and recording the path as an upstream influence path; downstream traversal, tracking the increasing or transmitting direction of the state value until encountering a node or boundary node with the state value being a local maximum value, and recording the path as a downstream influence path; splicing the overload edge, the upstream influence path and the downstream influence path thereof to form a complete candidate force transmission path; and performing aggregation analysis on the plurality of candidate force transmission paths, and if the plurality of candidate force transmission paths share the same nodes exceeding a certain proportion, merging the candidate force transmission paths to define a key force transmission path.
8. The adjustable micro pile-steel mesh cooperative support system according to claim 6, wherein calculating the state value imbalance of each node on the critical force transmission path, identifying weak nodes with state values significantly lower than those of adjacent nodes, comprises: Traversing each node on the key force transmission path to obtain a normalized state value stored in the integral force-bearing framework of the node; for each non-endpoint node on the path, searching a direct precursor node and a direct subsequent node of the non-endpoint node on the key force transmission path, and acquiring normalized state values of the two adjacent nodes; calculating the absolute value of the difference value between the current node state value and the state value of the direct precursor node, and marking the absolute value as a forward difference value; calculating the absolute value of the difference value between the current node state value and the state value of the direct subsequent node, and recording the absolute value as a backward difference value; averaging the forward difference value and the backward difference value to obtain the local state unbalance of the node; comparing the local state unbalance of all nodes on the key force transmission path with a preset unbalance threshold; And marking the nodes of which the local state unbalance degree exceeds a threshold value and the state values of the nodes are simultaneously lower than the state values of the direct predecessor and the direct successor nodes, and identifying the nodes as weak nodes of which the state values are obviously lower than those of the adjacent nodes.
9. The adjustable micro pile-steel mesh co-operating support system according to claim 6, wherein applying additional pre-stress to the steel mesh nodes corresponding to the weak nodes comprises: inquiring the accurate position of the weak node in the steel mesh geometric model and the connection relation of the weak node; According to the state gradient of the integral stress skeleton at the weak node, calculating a prestress theoretical value required by balancing unbalance degree; According to the prestress theoretical value, matching the closest tension gear and the duration of the load from a prestored steel mesh tensioning equipment control parameter library; And generating a specific tensioning control signal, wherein the specific tensioning control signal designates coordinates of a target steel mesh node, a tensioning equipment number to be started, a target tensioning force value and a tensioning action time sequence.
10. The adjustable micro pile-steel mesh cooperative support system according to claim 9, wherein the calculating the theoretical prestress value required for balancing unbalance according to the state gradient of the overall stressed skeleton at the weak node comprises: in the whole stressed framework, taking the identified weak node as a center, and extracting all directly connected topological edges; calculating the difference of state values between the weak node and each adjacent node, and dividing the difference by the theoretical length of the corresponding topological edge to obtain the state gradient of the weak node pointing to each adjacent node; selecting the direction with the largest absolute value of the direction state gradient as the main gradient direction, and marking the gradient value as the main gradient value; obtaining an elastic modulus value of the steel mesh material under design specifications and an equivalent area of a steel mesh section at a weak node; Multiplying the main gradient value, the elastic modulus of the steel mesh material and the equivalent area of the steel mesh section to obtain a preliminary force compensation value; and correcting the preliminary force compensation value according to the topological importance of the weak node in the force distribution network in the steel network, wherein the correction coefficient is larger as the importance is higher, and the finally calculated force value is the prestress theoretical value required by the balance unbalance degree.

Description

Adjustable miniature pile-steel mesh cooperative support system Technical Field The invention relates to the technical field of geotechnical engineering support, in particular to an adjustable micro pile-steel mesh cooperative support system. Background In geotechnical engineering, a cooperative support system formed by micro piles and steel nets is widely used for reinforcing foundation pits and slopes. The prior art generally relies on the placement of discrete sensors at structural keypoints to monitor the stress of the micropile or the displacement of the structure. These monitoring means acquire isolated, local physical quantity data. For the whole support system, the space transmission path and dynamic distribution mechanism of the forces among piles, nets and soil cannot be directly observed and analyzed. A gap exists between the monitoring data and the real mechanical state in the structure, and the overall security assessment of the system is based on numerical simulation and experience judgment, and lacks direct and global feedback from the physical structure. The prior art has the defect that the internal space mechanical topological structure of the support system cannot be constructed and visualized in real time. Discrete data points are difficult to restore the actual transmission chain formed by the load in the miniature pile group, and a true distribution network of the forces in the steel mesh cannot be depicted. The recognition of the weak links of the system has hysteresis, and early warning cannot be carried out in the early stage of unfavorable evolution of the mechanical network. Corresponding adjusting measures are often based on macroscopic deformation or experience, lack of accurate guiding for internal force flow states, belong to passive response, and are insufficient in adjusting efficiency and reliability. The invention aims to solve the problems, and is required to be capable of sensing and constructing a topological graph of pile-net-soil interaction in real time, dynamically identifying a core load transmission chain and an internal force distribution network in the topological graph, generating an accurate cooperative adjustment instruction based on morphological characteristics of a mechanical framework, and realizing the transition from passive bearing to active sensing and dynamic optimization of a support system. Disclosure of Invention The invention aims to provide an adjustable micro pile-steel mesh cooperative support system so as to solve the problems in the background technology. To achieve the above object, the present invention provides an adjustable micro pile-steel mesh cooperative support system, the system comprising: The data acquisition module is used for arranging a plurality of stress induction units at the soil body interface between the pile body of the miniature pile of the supporting structure and the pile, wherein the stress induction units acquire clump of pile-soil contact stress spectrum in real time, a displacement tracking unit is arranged at the joint of the steel mesh and the miniature pile, and the displacement tracking unit is used for continuously monitoring the three-dimensional displacement of the joint; The interaction modeling module is used for constructing a pile-net-soil interaction topological graph based on the spatial correlation between the pile-soil contact stress spectrum and the node three-dimensional displacement; the stress network identification module is used for carrying out real-time deduction on the pile-net-soil interaction topological graph through an interaction evolution algorithm, and identifying a miniature pile load transmission chain and a steel mesh internal force distribution network; the cooperative framework generation module is used for fusing the miniature pile load transmission chain with a steel mesh internal force distribution network to form an integral stressed framework of the cooperative supporting structure; And the adjusting instruction generating module is used for automatically generating a miniature pile axial force adjusting instruction and a steel mesh prestress compensating instruction according to the morphological characteristics of the integral stressed framework. Preferably, constructing a pile-net-soil interaction topology map based on the spatial correlation between the pile-soil contact stress spectrum and the node three-dimensional displacement amount, includes: extracting stress peaks and valleys of a plurality of time periods from a continuous pile-soil contact stress spectrum to form a stress time sequence feature vector; carrying out coordinate transformation on the three-dimensional displacement of the node, mapping the displacement track into a local coordinate system taking a support surface as a reference, and generating a node displacement track sequence; calculating correlation coefficients between stress time sequence feature vectors corresponding to each stress sensing uni