Risk assessment method and device for water-rich sandy stratum foundation pit and medium

Abstract

The invention relates to a risk assessment method and device for a water-rich sandy stratum foundation pit and a medium. The method comprises the steps that multiple types of foundation pit monitoring data are collected; setting a plurality of levels of risk evaluation indexes and membership weights according to the membership, wherein the plurality of types of foundation pit monitoring data are used as the risk evaluation index of the lowest level; dividing a plurality of risk levels and membership functions corresponding to the risk levels; calculating the risk membership degree of each type of foundation pit monitoring data for each risk level according to the membership degree function; and according to the risk membership degree and the membership weight, through weighted calculation, obtaining risk membership degree distribution of other risk evaluation indexes for each risk level, and according to the risk membership degree, evaluating the risk level of the risk evaluation indexes. Compared with the prior art, the method has the advantages of high real-time performance, high accuracy, high efficiency, automation and the like.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a risk assessment method, device and medium for foundation pits in water-rich sandy strata. Background technique [0002] With the rapid development of my country's urban construction and economy, more and more cities have begun to carry out large-scale subway construction. The foundation pit engineering of urban subway stations is not only facing deeper and deeper problems, but the surrounding environment is also becoming more and more complicated. Often buildings (structures) are densely packed and underground pipelines are complex. Once a foundation pit accident occurs, it will not only affect the progress of the project, cause huge economic losses and casualties, but also cause social panic and bad public opinion, resulting in very negative social impact. [0003] At present, there are various foundation pit risk assessment methods, but most of them are based on the overall as...

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Problems solved by technology

[0002] With the rapid development of my country's urban construction and economy, more and more cities have begun to carry out large-scale subway construction. The foundation pit engineering of urban subway stations is not only facing deeper and deeper problems, but the surrounding environment is also becoming more and more complicated. Often the buildings (structures) are dense and the underground pipelines are complicated. Once a foundation pit accident occurs, it will not only affect the progress of the project, cause huge economic losses and casualties, but also cause social panic and bad public opinion, resulting in very negative social impact

[0003] At present, there are various foundation pit risk assessment methods, but most of them are based on the overall assessment of foundation pit risk based on various foundation pit risk factors. Quantitative Risk Assessment

[0004] The monitoring data of the foundation pit can better reflect the state of the foundation pit body and the surrounding environment in real time, especially the cumulative value and daily change rate of the monitoring data have very good warning significance for the risk assessment of the foundation pit. However, these data do not directly reflect the risk level of the foundation pit, and the risk level of the project cannot be directly reflected;

[0005] In addition, the current studies on the risk assessment of foundation pits mostly focus on soft soil foundation pits, and there are very few risk assessments for foundation pits in water-rich sandy strata. The distribution area of ​​water-rich sandy strata is relatively small, and its formation With the characteristics of high water level and strong water permeability, the influence of groundwater is greater, and the risk of foundation pit is more likely to occur

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