Deep foundation pit enclosure wall stress deformation quick calculating method in consideration of wall soil coupling

Abstract

The invention provides a deep foundation pit enclosure wall stress deformation quick calculating method in consideration of wall soil coupling; and the method fully considers a coupling relation of wall soil deformation in the foundation pit excavation unloading process, and has the advantages of high calculating efficiency, more accordance with actual conditions and the like. The method comprisesthe following steps: (1) an elastic foundation beam model is built (an elastic beam is adopted to simulate a ground continuous wall, a spring unit is adopted to simulate a support, a soil spring unitis adopted to simulate in-pit soil, and the soil pressure adopts a non-limit soil pressure model), and related calculating parameters are determined; (2) the after-wall soil pressure distribution iscalculated (the supposed wall deformation is firstly calculated as zero); (3) a stress balance equation of the ground continuous wall is calculated to obtain corresponding wall deformation; (4) wall deformation errors calculated by two times are judged to restrain to a set value; and if requirements are not met, the steps (2) to (4) are repeated until the errors are restrained to the set value toobtain a final wall deformation value; and (5) the wall bending moment and shearing force and the after-wall soil pressure distribution are calculated based on the wall deformation value.

Description

technical field [0001] The invention relates to the field of geotechnical engineering calculations, and mainly relates to a fast calculation method for force deformation of a retaining wall of a deep foundation pit considering wall-soil coupling. Background technique [0002] Foundation pit engineering has always played a vital role in the rapid development of urban underground space. The determination of the earth pressure load on the enclosure structure is the key link in the engineering design of the foundation pit. The value of earth pressure load not only affects the safety of the entire foundation pit project, but also plays a key role in controlling the construction cost. [0003] At present, important progress has been made in the research on unlimited earth pressure, such as "Unlimited soil pressure of rigid retaining wall considering the influence of deformation" published by Chen Yibo et al. in "Journal of Rock Mechanics and Engineering" (2015 Vol. Pressure rese...

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Problems solved by technology

However, the correction method of this patent is still based on the assumption of earth pressure. Although the model has been improved, it still ignores the process of the development of the earth pressure model from static earth pressure to active earth pressure caused by wall deformation in actual engineering.

At present, finite element software can solve the problem of foundation pit excavation more accurately, but because it requires more parameters, the model establishment is complicated, and the calculation efficiency is low, it is more inclined to use some simple-answer design software in the initial stage of design

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