Monitoring and early warning method for stability of foundation pit based on underground water dynamic loading

Abstract

The invention provides a monitoring and early warning method for stability of a foundation pit based on underground water dynamic loading, and belongs to the field of monitoring for the stability of foundation pits, which aims at solving the problem of poor accuracy in predicting of the traditional foundation pit slope safety predicting method which is based on a predicting evaluation model established by a single displacement information parameter. The monitoring and early warning method comprises the following steps of step 1, selecting monitoring points and reference points of a deep foundation pit project; step 2, arranging and installing foundation pit underground water level and displacement monitoring equipment; step 3, monitoring the underground water level and slope displacement of the foundation pit, and processing data; step 4, determining the loading and unloading dynamic parameters of the foundation pit slope caused by the change of underground water; step 5, determining the underground water dynamics and displacement coupling evaluation parameters of the foundation pit slope; step 6, determining the early warning judging basis for the slope stability caused by the change of the underground water level of the foundation pit. The monitoring and early warning method has the advantages that various effective displacement and underground water dynamic information are organically combined, the multi-source information coupling predicting is performed on the stability of the slope of the foundation pit, and the accuracy in safety predicting of the slope of the foundation pit is improved.

Description

technical field [0001] The invention belongs to the field of water-induced foundation pit slope dynamic stability evaluation and prevention, and in particular relates to a foundation pit stability monitoring and early warning method based on groundwater dynamic loading. Background technique [0002] Deep foundation pit engineering has the characteristics of large deformation, strong suddenness, serious hazards, and many instability factors, which account for a considerable proportion of engineering construction accidents. At present, in the construction process of deep foundation pit engineering, due to the complex construction environment, accidents of foundation pit slope instability under the action of groundwater often occur even for permanent foundation pits that have been excavated. Therefore, after the excavation of the deep foundation pit is completed, it is also necessary to monitor the groundwater and the stability of the slope of the foundation pit in real time, s...

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Problems solved by technology

[0003] Aiming at the above-mentioned problem that the traditional foundation pit slope safety prediction method is based on a prediction evaluation model established by a single displacement information parameter, resulting in poor prediction accuracy, the present invention provides a foundation pit stability monitoring and early warning method based on groundwater dynamic loading, This method monitors and integrates the underground water level and displacement or displacement rate of the foundation pit at the same time, so as to determine and establish the coupled integrated dynamic prediction parameters of the groundwater level and displacement or displacement rate of the foundation pit, and uses the basic principles of elastic mechanics and damage mechanics, Establish the functional relationship between the water level change and the loading and unloading response ratio parameter, and use the loading and unloading response ratio parameter turning point method to determine the water level when the foundation pit slope changes from slow deformation to rapid deformation as the critical instability water level, so as to stabilize the foundation pit slope Sex monitoring and early warning

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