Method for preventing settlement of underground structure

Abstract

The invention discloses a method for preventing settlement of an underground structure. The method comprises the following steps of: 1) analyzing the shear creep characteristic of a soil body, and testing the shear creep characteristic of a pile-soil interface; 2) analyzing the influence of the soil body unloading rebound on the single-pile bearing characteristic by a finite element numerical simulation method; 3) analyzing the distribution rule of the side friction resistance of the pile body under the pile top up-pulling load and the influence of the excavation unloading on the bearing characteristic of an anti-floating pile; 4) verifying whether the bearing characteristic of an uplift pile considering the foundation pit excavation influence is reasonable through a normal physical model test and a centrifuge test; and 5) calculating the pile group effect coefficient of the anti-floating pile by use of a finite element analysis method; and in combination with a pile-soil-raft combined action analysis method, obtaining the working performance of the anti-floating pile of the underground structure and the long-term vertical deformation data of the structure, and performing anti-settlement treatment. Compared with the prior art, the method disclosed by the invention effectively eliminates the phenomenon of settlement of the underground structure by detecting the working performance of the anti-floating pile of the underground structure and the long-term vertical deformation rule of the structure.

Description

technical field [0001] The invention relates to a method for preventing structure settlement, in particular to a method for preventing underground structure settlement. Background technique [0002] Large-scale deep-buried underground structures require ultra-deep foundation pit excavation construction, and large-scale pile groups are also required to bear the structural load and the buoyancy of groundwater. The unloading and rebound of the soil in the foundation pit excavation will cause changes in the stress field and displacement field of the soil around the pile, which will affect the bearing characteristics of the pile foundation and the settlement deformation of the structure under normal working conditions. At present, there are few studies on the influence of foundation pit excavation on the working characteristics of pile foundations in the pit. Only a few scholars have used numerical simulation to analyze the ultimate bearing capacity of single piles. The accuracy ...

AI Technical Summary

Problems solved by technology

At present, there are few studies on the influence of foundation pit excavation on the working characteristics of pile foundations in the pit. Only a few scholars have used numerical simulation to analyze the ultimate bearing capacity of single piles. The accuracy of numerical analysis depends on factors such as pile-soil interaction and soil properties. The accuracy and rationality of the simulation, at the same time, the numerical simulation cannot reflect the influence of soil over-consolidation, and does not fundamentally solve the phenomenon of structural settlement