Monitoring and early warning method of the stability of a foundation pit supporting structure

Abstract

The invention belongs to engineering design field and relates a monitoring and early warning method of the stability of a foundation pit supporting structure. The method comprises initial designing of deep foundation pit supporting structure firstly, monitoring of transformation and soil pressure of deep foundation pit supporting structure secondly, determining the risk of instability caused by the displacement of foundation pit excavation parameters thirdly, determining the foundation pit excavation supporting structure coupling monitoring and early warning value fourthly, analyzing and evaluating the stability of the foundation pit supporting structure in the process of excavation according to the foundation pit coupling monitoring and early warning value. The method changes the traditional displacement time-series forecasting method only selecting landslide displacement or displacement rate as the thinking of monitoring and evaluation parameters, the discharging of the excavation of foundation pit and the changing of the dynamic loading values and the foundation pit displacement or displacement rate are synchronization monitored and calculated, and the specific coupling monitoring and early warning value is provided.

Description

technical field [0001] The invention belongs to the field of engineering design and relates to a stability monitoring and early warning method for foundation pit engineering support structures. Background technique [0002] With the rapid development of national economic construction and the relative shortage of land resources, underground space for various purposes has been widely developed and utilized all over the world, and a large number of deep foundation pit projects have also been produced, and the foundation pits are excavated toward Large area, deep excavation depth, and more complex surrounding environment tend to develop. Therefore, the stability requirements for foundation pit support engineering are getting higher and higher. At present, in the analysis and evaluation of the stability of the deep foundation pit support structure, the method often used is the fixed value design method, that is, the ratio of the resistance effect to the load effect is used as th...

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Problems solved by technology

However, due to the incompleteness of the design theory and the differences and complexity of the geology and environment of the foundation pit engineering, people's cognitive ability and experience are still very insufficient. At present, the monitoring and alarm value of the foundation pit still uses a single monitoring factor (displacement, internal force, etc.) The alarm estimation range value cannot be used for organic coupling analysis of multi-monitoring influencing factors. There is no definite discriminant value for different types of deep foundation pit projects, which is often inconvenient to operate in actual projects and often leads to stability or failure of deep foundation pit projects. Misjudgment and misjudgment of stability early warning, increasing the risk of its stability or instability early warning

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