CN-122020100-A - Servo support type deep foundation pit enclosure wall lateral deformation measuring method and device

CN122020100ACN 122020100 ACN122020100 ACN 122020100ACN-122020100-A

Abstract

The application discloses a method and a device for measuring lateral deformation of a servo support type deep foundation pit enclosure wall body, and relates to the technical field of wall body deformation detection, wherein the method comprises the steps of obtaining mechanical pressure compensating data of a servo support device in an automatic compensation process, determining a design rigidity interval based on device parameters of the servo support device, taking the design rigidity interval as a constraint condition, extracting linear characteristics of the mechanical pressure compensating data, and determining an elastic datum line; and constructing and solving a stress balance equation of the enclosure wall based on the soil body continuous stiffness function and the mechanical pressure compensation data to obtain lateral deformation curves of the enclosure wall at different depths. The application achieves the technical effect of accurately monitoring the deformation result of the wall body.

Inventors

CHEN GUANGZI
CHEN JINJIAN
WANG JIANFENG
LI MINGGUANG
ZHEN LIANG
WANG XIONG
LIU NIANWU

Assignees

上海交通大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The method for measuring the lateral deformation of the servo support type deep foundation pit enclosure wall body is characterized by comprising the following steps of: Acquiring mechanical pressure compensating data of a servo supporting device in an automatic compensation process, and determining a designed stiffness interval based on device parameters of the servo supporting device, wherein the mechanical pressure compensating data comprise axial force increment data and mechanical extension data; taking the designed stiffness interval as a constraint condition, carrying out linear feature extraction on the mechanical pressure compensation data, and determining an elastic datum line; screening inelastic deviation data sets meeting preset conditions in the mechanical pressure compensating data based on the elastic reference line, wherein the inelastic deviation data sets are data after noise caused by assembly gaps is removed; Updating the soil body counter force coefficient reference value based on the inelastic deviation data set and the elastic reference line to generate a soil body continuous stiffness function; and constructing and solving a stress balance equation of the enclosure wall based on the soil mass continuous stiffness function and the mechanical pressure compensation data to obtain lateral deformation curves of the enclosure wall at different depths.
2. The method for measuring lateral deformation of a servo-supported deep foundation pit enclosure wall according to claim 1, wherein the determining a design stiffness interval based on device parameters of the servo-supported device comprises: based on the device parameters of the servo supporting device, calculating to obtain the elastic compression quantity caused by the increment of the unit axial force; And expanding the range of the elastic compression amount according to a first preset multiple to obtain a designed rigidity interval.
3. The method for measuring lateral deformation of a servo support type deep foundation pit enclosure wall according to claim 1, wherein the linear feature extraction is performed on the mechanical pressure compensation data by taking the designed stiffness interval as a constraint condition, and the determining of an elasticity datum line comprises: Extracting any two groups of axial force increment data and mechanical extension data from the mechanical pressure supplementing data through a random sampling consistency algorithm, and constructing a linear equation; taking the designed stiffness interval as a constraint condition of a linear equation, and calculating a plurality of internal points in the mechanical pressure compensation data if the slope of a straight line corresponding to the linear equation is in the designed stiffness interval; and (3) taking the linear equation with the largest number of inner points as an elastic datum line in the automatic compensation process as a straight line.
4. The method for measuring lateral deformation of a servo-supported deep foundation pit enclosure wall according to claim 3, wherein calculating the plurality of internal points in the mechanical compensation data if the slope of the straight line corresponding to the linear equation is within the designed stiffness interval comprises: If the slope of the straight line corresponding to the linear equation is in the designed stiffness interval, traversing all data points in the mechanical pressure compensation data, and calculating Euclidean distance between each data point and the straight line corresponding to the linear equation; And taking each data point with the Euclidean distance smaller than a preset tolerance threshold as a plurality of inner points in the mechanical pressure compensation data.
5. The method for measuring lateral deformation of a servo support type deep foundation pit enclosure wall according to claim 1, wherein the step of screening inelastic deviation data sets meeting preset conditions in the mechanical compensation data based on the elastic reference line comprises the steps of: calculating a first sum value between an elasticity predicted value corresponding to the elasticity datum line and a preset tolerance threshold value; For mechanical pressure compensation data at any moment, if the mechanical protrusion data are larger than the first sum value and the axial force increment data are larger than the maximum value of the axial force increment data of a second preset multiple, determining that the mechanical pressure compensation data at the current moment meet preset conditions; And constructing an inelastic deviation data set based on the mechanical pressure-compensating data at a plurality of moments meeting preset conditions.
6. The method for measuring lateral deformation of a servo support type deep foundation pit enclosure wall according to claim 1, wherein updating the soil body reaction force coefficient reference value based on the inelastic deviation data set and the elastic reference line to generate a soil body continuous stiffness function comprises: Calculating rigidity response deviation degrees at different depths based on the inelastic deviation data set and an elastic datum line; And mapping the rigidity response deviation degree into a soil body reaction force reduction coefficient, and updating a soil body reaction force coefficient reference value through the soil body reaction force reduction coefficient to generate a soil body continuous rigidity function.
7. The method for measuring lateral deformation of a servo-supported deep foundation pit enclosure wall according to claim 6, wherein updating the soil reaction coefficient reference value by the soil reaction reduction coefficient to generate a soil continuous stiffness function comprises: updating the soil body reaction force coefficient reference value through the soil body reaction force reduction coefficient to obtain soil body reaction force coefficients at a plurality of depths; processing the soil body counter-force reduction coefficients at different depths through an interpolation algorithm to obtain a continuous reduction coefficient curve; And carrying out smoothing treatment on the soil counter-force coefficient based on the continuous reduction coefficient curve to generate a soil continuous stiffness function.
8. The method for measuring lateral deformation of a servo support type deep foundation pit enclosure wall according to claim 1, wherein the constructing and solving the stress balance equation of the enclosure wall based on the soil mass continuous stiffness function and the mechanical pressure compensation data to obtain lateral deformation curves of the enclosure wall at different depths comprises: Determining bending resistance data of the enclosure wall and soil pressure corresponding to different depths; Constructing and obtaining a stress balance equation based on the bending resistance data, the soil mass continuous stiffness function, the mechanical pressure compensation data and the soil mass pressure, wherein the stress balance equation is a fourth-order ordinary differential equation; And converting the stress balance equation into a linear equation set through a finite difference method to carry out numerical solution, so as to obtain lateral deformation curves of the enclosure wall at different depths.
9. The method for measuring lateral deformation of a servo support type deep foundation pit enclosure wall according to claim 8, wherein the step of converting the stress balance equation into a linear equation set by a finite difference method to perform numerical solution to obtain lateral deformation curves of the enclosure wall at different depths comprises the steps of: Dividing the enclosure wall into a plurality of wall nodes along the depth direction; For any wall node, converting the fourth-order ordinary differential equation into a linear algebraic equation through a differential formula; integrating linear algebraic equations of all the wall nodes to obtain a matrix equation comprising a stiffness matrix, a displacement vector to be solved and a load vector; solving the matrix equation by a Gaussian elimination method to obtain lateral displacement values of all wall nodes; And carrying out smoothing treatment on each lateral displacement value to obtain lateral deformation curves of the enclosure wall at different depths.
10. A servo-supported deep foundation pit enclosure wall lateral deformation measurement device, characterized in that the device comprises a memory, a processor and a servo-supported deep foundation pit enclosure wall lateral deformation measurement program stored on the memory and operable on the processor, the servo-supported deep foundation pit enclosure wall lateral deformation measurement program being configured to implement the steps of the servo-supported deep foundation pit enclosure wall lateral deformation measurement method according to any one of claims 1 to 9.

Description

Servo support type deep foundation pit enclosure wall lateral deformation measuring method and device Technical Field The application relates to the technical field of wall deformation detection, in particular to a servo support type method and a device for measuring lateral deformation of a deep foundation pit enclosure wall. Background The existing deep foundation pit engineering usually adopts a servo steel supporting system to maintain stable axial force. Although the servo system can generate high-frequency axial force and extension data in the automatic compensation process, great difficulty exists in inverting the deformation of the enclosure wall by directly utilizing the data. The method is mainly characterized in that an assembly gap exists at a mechanical connection part (such as a movable head) of a servo system, the characteristic of low rigidity which is shown in a closing process of the servo system is similar to wall yielding caused by wall soil rheology in mathematical morphology, serious signal aliasing is formed, a characteristic separation means based on physical priori is lacking in the prior art, real soil property change information cannot be extracted from mixed noise, and accurate monitoring of wall deformation cannot be realized by using servo data. Disclosure of Invention In order to solve the technical problems that in the related art, a feature separation means based on physical priori is lacking, and real soil body character change information cannot be extracted from mixed noise, so that accurate monitoring of wall deformation cannot be realized by using servo data, the application provides a servo support type method and a device for measuring lateral deformation of a deep foundation pit enclosure wall. The adopted technical scheme is as follows: Acquiring mechanical pressure compensating data of the servo supporting device in an automatic compensation process, and determining a designed stiffness interval based on device parameters of the servo supporting device, wherein the mechanical pressure compensating data comprise axial force increment data and mechanical extension data; Taking the designed stiffness interval as a constraint condition, carrying out linear feature extraction on mechanical pressure compensation data, and determining an elastic datum line; Based on an elastic reference line, screening inelastic deviation data sets meeting preset conditions in mechanical pressure compensating data, wherein the inelastic deviation data sets are data after noise caused by assembly gaps is removed; Updating the soil body counter force coefficient reference value based on the inelastic deviation data set and the elastic reference line to generate a soil body continuous stiffness function; and constructing and solving a stress balance equation of the enclosure wall based on the soil mass continuous stiffness function and the mechanical pressure supplementing data to obtain lateral deformation curves of the enclosure wall at different depths. In one possible embodiment of the present application, determining the design stiffness interval based on the device parameters of the servo support device includes: based on device parameters of the servo supporting device, calculating to obtain elastic compression quantity caused by unit axial force increment; And expanding the range of the elastic compression amount according to a first preset multiple to obtain a designed stiffness interval. In one possible embodiment of the present application, using the designed stiffness interval as a constraint condition, performing linear feature extraction on mechanical pressure compensation data to determine an elastic reference line, including: Extracting any two groups of axial force increment data and mechanical extension data from mechanical pressure supplementing data through a random sampling consistency algorithm, and constructing a linear equation; taking the designed stiffness interval as a constraint condition of a linear equation, and calculating a plurality of internal points in mechanical pressure compensation data if the slope of a straight line corresponding to the linear equation is in the designed stiffness interval; and (3) taking the linear equation with the largest number of inner points as an elastic datum line in the automatic compensation process as a straight line. In one possible embodiment of the present application, if the slope of the straight line corresponding to the linear equation is within the designed stiffness interval, calculating a plurality of internal points in the mechanical pressure compensation data includes: if the slope of the straight line corresponding to the linear equation is in the designed stiffness interval, traversing all data points in the mechanical pressure compensation data, and calculating Euclidean distance between each data point and the straight line corresponding to the linear equation; And taking each data point with the Euclidean dis