Out-of-pit ground surface settlement prediction method considering whole foundation pit excavation process in soft soil area

Abstract

The invention relates to an out-of-pit ground surface settlement prediction method considering the whole foundation pit excavation process in a soft soil area, which comprises the following steps: carrying out ground surface settlement monitoring on the whole foundation pit excavation process; based on the monitoring data, obtaining a first relation function between the transverse maximum settlement value of the out-pit surface and the excavation depth and a second relation function between the transverse maximum settlement position of the out-pit surface and the excavation depth, and based on the first relation function and the second relation function, obtaining an out-pit surface transverse settlement prediction function considering the whole foundation pit excavation process; based on the complementary error function and the transverse maximum settlement value of the ground surface outside the pit, obtaining a longitudinal settlement prediction function of the ground surface outside the pit considering the whole foundation pit excavation process; and obtaining a settlement value of any point outside the pit at any excavation stage based on a curve of the transverse settlement prediction function of the ground surface outside the pit and the longitudinal settlement prediction function of the ground surface outside the pit. On the basis of foundation pit deformation monitoring data and in combination with theoretical analysis, ground surface settlement outside a pit in the whole foundation pit excavation process can be dynamically predicted, and the reliability of foundation pit monitoring can also be evaluated.

Description

technical field [0001] The invention relates to the field of surface subsidence prediction, in particular to a method for predicting surface subsidence outside a pit considering the whole process of foundation pit excavation in soft soil areas. Background technique [0002] With the vigorous development of urban engineering construction activities, the city's demand for land resources is increasing, and more and more foundation pit projects are close to buildings, subway stations, underground pipelines, etc. It is inevitable to carry out foundation pit construction along the subway tunnel, and excavation of foundation pits in soft soil areas with dense buildings and pipelines will inevitably bring disturbances to the adjacent environment, such as causing uneven settlement of the road surface, deformation of underground pipelines, Severe cases may even cause cracking and damage to the structure. It can be seen that it is very important to accurately, quickly and easily predi...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems in the prior art, the present invention provides a method for predicting surface settlement outside the pit considering the whole process of foundation pit excavation in soft soil areas, and solves the problem of poor prediction effect in the prior art

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