Numerical simulation analysis method for deformation of soft soil deep foundation pit

Abstract

The invention discloses a numerical simulation analysis method for the deformation of a soft soil deep foundation pit. The numerical simulation analysis method comprises the following steps: firstly taking soft soil to carry out a triaxial compression creep experiment in a laboratory before the excavation of the foundation pit, obtaining time hardening model creep parameters of the soft soil through STATISTIC software fitting, in the design stage of the foundation pit, applying large finite element software ABAQUS to build a finite element model, building the influence at the simulation infinity of an infinite element on the excavation of the foundation pit around the model, and obtaining the earth excavation manner and the excavation time of the foundation pit as well as the influence rule of a construction gap for stress and deformation of the foundation pit through analog computation. In the design stage, the construction parameters of the foundation pit, particularly the three important parameters such as earth excavation manner, earth excavation time and construction gap, can be optimally designed. Through the optimization of the three parameters, the deformation and support shaft force of the foundation pit can be effectively reduced, and then the safety coefficient of the foundation pit is increased.

Description

technical field [0001] The invention relates to a numerical simulation analysis method, in particular to a numerical simulation analysis method for soft soil deep foundation pit deformation considering the influence of adjacent buildings, and belongs to the analysis field of numerical simulation of the influence of adjacent buildings on soft soil deep foundation pit deformation. Background technique [0002] With the continuous development of my country's economy and the acceleration of urbanization, the number of deep foundation pit projects is increasing day by day. The construction of deep foundation pit projects will inevitably cause large displacement and deformation of the surrounding strata, accompanied by strong environmental effects, resulting in the surrounding Buildings produce uneven settlement and even cracks, especially in soft soil. Therefore, the design and construction of deep foundation pit engineering are becoming more and more difficult, the risks are ...

AI Technical Summary

Problems solved by technology

[0003] 1) The design method of soft soil deep foundation pit engineering based on deformation control lacks reliable theoretical guidance, and it is difficult to achieve scientific design. The design of deep foundation pit engineering is too conservative under certain conditions, resulting in great waste, while in others Under the circumstances, there is a greater potential safety hazard, which brings greater risks to the construction and safe use of deep foundation pit engineering;

[0004] 2) The understanding of the foundation pit enclosure structure and formation deformation laws and mechanisms caused by the excavation of deep foundation pits in soft soil is not clear enough, and it is difficult to achieve refined design and construction

The deformation control index is single and the standard is absolute, which makes it difficult to meet the complex and sensitive environmental requirements around deep foundation pits;

[0005] 3) There are fragmentation phenomena in the design and construction of deep foundation pits in soft soil. In the design of deep foundation pits, different construction parameters cannot be used to simulate the excavation process of deep foundation pits to obtain optimized construction parameters.

Images