Back analysis method of foundation pit based on lateral displacement monitoring data of retaining wall

A technology for monitoring data and inverse analysis, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of complex calculation and weak engineering operability, and achieve the effect of improving prediction accuracy and small error.

Active Publication Date: 2018-12-28
CHONGQING UNIV IND TECH RES INST
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  • Claims
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Problems solved by technology

In the existing technology, the method of back analysis of soil parameters related to foundation pit monitoring data is mostly concentrated on numerical analysis method, the engineering operability is weak, and the calculation is complicated

Method used

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  • Back analysis method of foundation pit based on lateral displacement monitoring data of retaining wall
  • Back analysis method of foundation pit based on lateral displacement monitoring data of retaining wall
  • Back analysis method of foundation pit based on lateral displacement monitoring data of retaining wall

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Embodiment 1

[0033] Natural soil is formed by various complex geological processes in a long geological age, resulting in great differences in the properties of soil. Even in the same area and the same soil body, there will be strong variability of geological properties, which determines the variability of the soil parameters themselves.

[0034] The existing foundation pit analysis methods usually consider the soil as an isotropic homogeneous body, which makes it difficult to make an objective evaluation of the actual situation of the project. This embodiment introduces a reliability analysis method based on probability, combined with actual engineering, the normalized soil shear strength ratio of soil and the standardized soil stiffness ratio As a variable, the back analysis of the monitoring data is considered, so as to effectively predict the deformation of the foundation pit and dynamically adjust the design of the support structure.

[0035] see figure 2 , the depth of penetrat...

Embodiment 2

[0052] In this embodiment, the retaining wall penetrates into the hard soil layer to a depth of 3-5m. This embodiment discloses a foundation pit back analysis method based on retaining wall lateral movement monitoring data, including the following steps:

[0053] 1) Conduct investigation and sampling at multiple parts of the soil outside the retaining wall of the foundation pit. The soil parameters of the samples were statistically analyzed. See Table 4, the soil parameters include normalized soil shear strength and the standardized soil stiffness ratio Statistical indicators include normalized soil shear strength and the standardized soil stiffness ratio Statistical items include sample size, distribution interval, mean and coefficient of variation. Get the average value of the normalized soil shear strength ratio of the sample Normalized soil shear strength ratio coefficient of variation COV 1 , the average value of the normalized soil stiffness ratio of the samp...

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Abstract

A method for back analysis of foundation pit base on monitoring data of lateral displacement of retain wall is provided. By comparing the monitoring value of retaining wall lateral displacement with the theoretical value of retaining wall lateral displacement in the initial stage of excavation, the new soil parameters obtained in the last excavation stage are used to predict the lateral displacement of the retaining wall in the next excavation. The prediction accuracy is improved gradually and the error between the predicted value and the monitored value of the lateral displacement of the retaining wall is small. At the same time, the method incorporates the concept of reliability design into the prediction of retaining wall lateral displacement, taking into account the variability of soilmass, which is more in line with the engineering practice. The invention has the advantages of simple calculation, strong engineering operability, and can be used by relevant design and constructionpersonnel of the foundation pit, effectively predicts the deformation of the foundation pit, and dynamically adjusts the design of the supporting structure. The invention can be programmed into simpleprogram software, and is suitable for popularizing and using.

Description

technical field [0001] The invention relates to the field of civil engineering construction, in particular to a foundation pit back analysis method. Background technique [0002] With the development of urban construction, the urban population density is high, and the available land resources are becoming more and more limited, so the development and utilization of underground space has very broad prospects. Therefore, there are more and more deep foundation pit projects in urban construction. Deep foundation pit projects such as deep underground garages for medium and high-rise buildings in cities, subway stations, and underground shopping malls are showing high-density and high-difficulty trends. The surrounding construction environment is becoming more and more complex, and the requirements for survey, design, displacement monitoring, and information processing are higher and more stringent. . [0003] In the construction process of the foundation pit project, whether t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 仉文岗陈福勇张艳梅章润红
Owner CHONGQING UNIV IND TECH RES INST
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