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

Abstract

The invention discloses a numerical simulation analysis method for the deformation of deep foundation pits in soft soil. Before the foundation pit is excavated, the soft soil is taken to carry out triaxial compression creep experiments in the laboratory, and the time hardening model creep of the soft soil body is obtained by fitting with STATISTIC software. Variable parameters, in the foundation pit design stage, use the large-scale finite element software ABAQUS to establish a finite element model, build infinite elements around the model to simulate the influence of infinity on the excavation of the foundation pit, and obtain the excavation method and excavation method of the foundation pit through simulation calculations. Influence law of time and construction gap on stress and deformation of foundation pit. The invention can optimize the design of the construction parameters of the foundation pit at the design stage, especially the three important parameters of earthwork excavation mode, earthwork excavation time and construction gap. By optimizing these three parameters, the deformation of the foundation pit and the supporting axial force can be effectively reduced, thereby increasing the safety factor of the foundation pit.

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 gett...

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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.

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