Deep foundation pit excavation slope vertical displacement vector angle parameter monitoring and pre-warning method

Abstract

The invention aims to provide a slope stability detection and pre-warning method on the basis of simultaneous monitoring of horizontal displacement and vertical displacement of a slope crest of a foundation pit. The method includes the steps: selection of foundation pit excavation slope displacement monitoring points and datum points; arrangement and installation of displacement monitoring equipment; real-time monitoring of foundation pit excavation slope surface displacement and real-time processing of monitoring data; determination of foundation pit excavation slope vertical displacement vector angle parameters and sequence thereof; determination of pre-warning criterions for stability of the foundation pit excavation slope vertical displacement vector angle parameters; evaluation on dynamic stability of foundation pit excavation slopes and monitoring and pre-warning of instability. By coupling of horizontal displacement and vertical displacement of the foundation pit excavation slopes, an included angle formed by a foundation pit excavation slope surface displacement vector and the horizontal plane is defined as a vertical displacement vector angle, and evaluation and real-time monitoring and predication of dynamic stability of the foundation pit excavation slopes and pre-warning of instability are realized.

Description

technical field [0001] The invention relates to the technical field of fixed buildings, in particular to parameter detection and early warning of deep foundation pits, and in particular to a method for monitoring parameters and early warning of vertical displacement vector angles of excavation slopes of deep foundation pits. Background technique [0002] With the rapid development of my country's social economy and the limitation of non-renewable land resources, the development and utilization of underground space has become an inevitable trend, accompanied by a large number of deep foundation pit projects, which have large deformation, strong suddenness, and harmfulness. The characteristics of severe accidents, many instability factors, and the trend of developing to ultra-deep, ultra-large area, and ultra-complicated surrounding environments account for a considerable proportion of engineering construction accidents in my country. Therefore, the requirements for the safety ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned foundation pit monitoring and early warning method, and propose a slope stability detection and safety early warning method based on simultaneous monitoring of foundation pit slope top horizontal displacement and vertical displacement, the foundation pit slope stability evaluation method It can not only overcome the limitation that the static limit mechanics evaluation method cannot detect and analyze the change law of slope stability over time and the finite element analysis method cannot solve the problem of large deformation and the numerical simulation of discrete media, but also overcome the traditional foundation pit monitoring and early warning method Monitoring parameters and early warning methods for vertical displacement vector angle of deep foundation pit excavation slope without clear quantitative stability and instability criteria and unable to detect and determine its deformation properties

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