CN-121997656-A - Soft soil treatment combined type road surface structural design system

CN121997656ACN 121997656 ACN121997656 ACN 121997656ACN-121997656-A

Abstract

The invention relates to the technical field of civil engineering, soft soil mechanics and intelligent design, in particular to a soft soil processing composite pavement structure design system which comprises a data acquisition and reference reconstruction module, a rheological characteristic calculation module, a double-track differential verification module and an adaptive iteration correction module, wherein the data acquisition and reference reconstruction module is used for generating an ideal stress tensor field and an ideal elastic strain field which are used as reference data, the rheological characteristic calculation module is used for mapping the ideal stress tensor field into a theoretical rheological deviation tensor containing time correlation, the double-track differential verification module is used for calculating a spatial topological coherence coefficient and generating a rheological risk prompt signal or a risk elimination signal, and the adaptive iteration correction module is used for generating a corrected structural layer design modulus and feeding back to the data acquisition and reference reconstruction module to trigger a new round of calculation.

Inventors

ZHANG CHENGYI
SHU BIN
XIAO ZHIQIANG
LI DAN
CHEN QILIN
HUANG LIN

Assignees

成都交投交通建设管理集团有限公司

Dates

Publication Date: 20260508
Application Date: 20260122

Claims (8)

1. A soft soil treatment composite pavement structure design system, comprising: The data acquisition and reference reconstruction module is used for acquiring geological survey data of pavement engineering and a planned pavement structure scheme, establishing a finite element grid model based on the planned pavement structure scheme, and executing elastic field calculation for the finite element grid model, wherein the elastic field calculation ignores the influence of time dimension, so as to generate an ideal stress tensor field and an ideal elastic strain field which are used as reference data; the rheological characteristic calculation module is used for mapping an ideal stress tensor field into a theoretical rheological deviation tensor containing time correlation based on a viscoelastic relation defined by a Burger rheological model, wherein the theoretical rheological deviation tensor characterizes hypothetical deformation distribution only caused by a soft soil rheological mechanism; The double-track differential verification module is used for acquiring a full strain field considering the influence of all elements of the environment, obtaining a real deviation tensor by calculating the difference between the full strain field and an ideal elastic strain field, performing space geometric similarity analysis on the real deviation tensor and a theoretical rheological deviation tensor, calculating a space topology coherent coefficient, and generating a rheological risk prompt signal or a risk elimination signal according to the space topology coherent coefficient; The self-adaptive iteration correction module responds to the rheological risk prompt signal, calculates the correction amplitude of the structural layer modulus based on the spatial topological coherence coefficient, generates the corrected structural layer design modulus, and feeds back to the data acquisition and reference reconstruction module to trigger a new calculation.
2. The soft soil treatment composite pavement structure design system of claim 1, wherein the performing of the elastic field calculation ignoring the time dimension effect on the finite element mesh model comprises: constructing a virtual transient balance computing environment, wherein the permeability coefficient parameter of a soft soil layer is forcedly set to zero in the computing environment to eliminate consolidation effect, and locking the constitutive model of the pavement material into an isotropic line elastic model; The method comprises the steps of inputting the rebound modulus and poisson ratio in geological survey data as constants by using generalized Hooke's law, solving a cauchy stress tensor without time variable as an ideal stress tensor field and solving a transient elastic strain tensor directly caused by external load as an ideal elastic strain field aiming at each node of a finite element grid model.
3. The soft soil treatment composite pavement structure design system of claim 1, wherein the rheological characteristic calculation module performs the following processing steps: Triaxial creep test data of the soft soil layer are extracted from geological survey data, curve fitting is carried out on the triaxial creep test data, and Maxwell body viscosity coefficient, kelvin body elastic modulus and Kelvin body viscosity coefficient required by a Burger model are extracted; Constructing a creep compliance function under unit stress, wherein the value of the creep compliance function consists of a first part, a second part and a third part, wherein the first part is a permanent settlement term which is determined based on a Maxwell body viscosity coefficient and grows linearly along with time, and the second part is a delayed rebound term which is determined based on a Kelvin body parameter and decays exponentially along with time; based on the viscoelastic correspondence principle, the product operation is carried out on the partial stress component in the ideal stress tensor field and the calculated value of the creep compliance function, so that the theoretical rheological deviation tensor is generated.
4. A soft soil treatment composite pavement structure design system as claimed in claim 3, wherein the specific generation logic of the theoretical rheological deviation tensor is: For each node in the ideal stress tensor field, calculating a hydrostatic pressure value and subtracting the hydrostatic pressure value from the original stress tensor to obtain an ideal bias stress tensor only driving the shape change; obtaining a time value of a current design reference period, substituting a creep compliance function, and calculating to obtain a current compliance scalar value; And multiplying each component of the ideal deflection stress tensor by a compliance scalar value and a preset coefficient respectively to obtain a result which is the theoretical rheological deviation tensor at the node.
5. The soft soil treatment composite pavement structure design system of claim 1, wherein the process of calculating the spatial topological coherence coefficient by the double-track differential verification module comprises: The first differential operation is carried out, namely the strain value of each node in the full strain field is subtracted from the strain value of the corresponding node in the ideal elastic strain field, and the actual deviation tensor representing the nonlinear environment interference and rheological mixing characteristics is obtained; traversing all grid nodes, calculating tensor double dot products of the actual deviation tensor and the theoretical rheological deviation tensor at each node, and accumulating calculation results of all the nodes to obtain a form coincidence degree value; The normalization operation is carried out, namely the square sum of deformation energy intensity of all nodes in the global space of the real deviation tensor and the theoretical rheological deviation tensor is calculated respectively, the open square root operation is carried out on the two square sum results respectively, and finally, the numerical values obtained by the two open square roots are multiplied to be used as normalization base numbers; Dividing the morphological coincidence ratio value by the normalization base number to obtain a quotient value which is a spatial topological coherent coefficient, wherein the coefficient is used for quantifying the similarity degree of a deformation mode in reality and a theoretical soft soil rheological mode in spatial distribution.
6. The soft soil treatment composite pavement structure design system of claim 5, wherein the deformation energy intensity calculation method is as follows: Acquiring all component elements of the corresponding tensor at a specific node; summing each component element after square operation; and performing open square root operation on the summation result to obtain the Frobenius norm at the node, and taking the Frobenius norm as the deformation energy intensity at the node.
7. The soft soil treatment composite pavement structure design system of claim 5, wherein the logic for generating the rheological risk cue signal or the risk exclusion signal according to the spatial topological coherence coefficient comprises: presetting a coherent threshold for judging rheological dominance; comparing the calculated spatial topological coherence coefficient with a coherence threshold value in value; If the spatial topological coherence coefficient is larger than the coherence threshold, judging that sedimentation in the current design scheme is mainly caused by soft soil rheology, and outputting a rheology risk prompting signal; If the spatial topological coherence coefficient is smaller than or equal to the coherence threshold, the mismatching of the deformation mode is judged, and a risk elimination signal is output.
8. The soft soil treatment composite pavement structural design system of claim 1, wherein the process of calculating the corrected structural layer design modulus by the adaptive iterative correction module comprises: acquiring a preset feedback gain coefficient and acquiring a limit tensile strain module value specified in a pavement design specification; calculating deformation magnitude ratio, namely calculating integral strength norm of the real deviation tensor in the whole domain, and dividing the integral strength norm by the ultimate tensile strain modulus; Calculating a rigidity compensation factor, namely multiplying the deformation magnitude ratio, the space topological coherent coefficient and the feedback gain coefficient, and adding the product result with a value I; And calculating a new modulus, namely multiplying the original elastic modulus in the planned pavement structure scheme by a rigidity compensation factor to obtain a corrected structural layer design modulus.

Description

Soft soil treatment combined type road surface structural design system Technical Field The invention relates to the technical fields of civil engineering, soft soil mechanics and intelligent design, in particular to a soft soil treatment composite pavement structure design system. Background In the current soft soil roadbed pavement engineering design and analysis environment, a pavement structure is under the complex coupling effect of all environmental factors such as vehicle axle load, temperature field, pore water pressure and the like for a long time, and a soft soil layer lying down has obvious rheological property developed along with time; Aiming at pavement structure design and settlement control, the prior proposal generally adopts a design evaluation mode of paying attention to total settlement quantity, namely, the stress deformation of pavement materials and the consolidation settlement of foundations are calculated directly through commercial finite element software or an empirical formula, and although the proposal has a certain macroscopic quantization capability in conventional evaluation, the proposal can not quantitatively strip elastic compression determined by the rigidity of pavement materials and harmful settlement caused by soft soil rheological mechanism due to lack of a decoupling mechanism aiming at physical sources of deformation, so that the pathological attribute of settlement is difficult to accurately identify in the design process, the resource waste caused by excessive design is extremely easy to be caused by confusing instantaneous settlement and rheological characteristics, or the hidden danger leakage judgment is caused by failure to identify hidden rheological risks, namely, a physical model is required to be established, the total settlement of pavement structures is accurately decoupled into non-time-dependent instantaneous settlement and time-dependent rheological settlement, therefore, how to construct an absolute rigid reference system under complex environmental load, the accurate stripping and quantitative diagnosis of the harmful settlement caused by soft soil rheological mechanism is realized, and the structural layer modulus is automatically corrected. Disclosure of Invention In order to solve the technical problems, the invention provides a soft soil treatment composite pavement structure design system, which specifically comprises the following steps: The data acquisition and reference reconstruction module is used for acquiring geological survey data of pavement engineering and a planned pavement structure scheme, establishing a finite element grid model based on the planned pavement structure scheme, and executing elastic field calculation for the finite element grid model, wherein the elastic field calculation ignores the influence of time dimension, so as to generate an ideal stress tensor field and an ideal elastic strain field which are used as reference data; the rheological characteristic calculation module is used for mapping an ideal stress tensor field into a theoretical rheological deviation tensor containing time correlation based on a viscoelastic relation defined by a Burger rheological model, wherein the theoretical rheological deviation tensor characterizes hypothetical deformation distribution only caused by a soft soil rheological mechanism; The double-track differential verification module is used for acquiring a full strain field considering the influence of all elements of the environment, obtaining a real deviation tensor by calculating the difference between the full strain field and an ideal elastic strain field, performing space geometric similarity analysis on the real deviation tensor and a theoretical rheological deviation tensor, calculating a space topology coherent coefficient, and generating a rheological risk prompt signal or a risk elimination signal according to the space topology coherent coefficient; The self-adaptive iteration correction module responds to the rheological risk prompt signal, calculates the correction amplitude of the structural layer modulus based on the spatial topological coherence coefficient, generates the corrected structural layer design modulus, and feeds back to the data acquisition and reference reconstruction module to trigger a new calculation. Preferably, the specific process of performing elastic field computation on the finite element mesh model that ignores the influence of the time dimension includes: constructing a virtual transient balance computing environment, wherein the permeability coefficient parameter of a soft soil layer is forcedly set to zero in the computing environment to eliminate consolidation effect, and locking the constitutive model of the pavement material into an isotropic line elastic model; The method comprises the steps of inputting the rebound modulus and poisson ratio in geological survey data as constants by using generalized Hooke's law, solving a cauchy stre