Theory and design method of permanent support for deep foundation pit using structural method of geotechnique
Based on the in-depth analysis of the current design status of the underground system of the project,the disadvantages such as wasting of temporary support resources,environmental pollution and carbon emission increase caused by the separation of geotechnical and structural specialties in the foundation pit was pointed out,and the theory and design method of the geotechnical structural permanent support system of deep foundation pit was put forward.The composition and construction process of the permanent support system were explained,and the design principle of the limit state of the permanent support system's bearing capacity and normal use limit state was given.The load combination and calculation contents of three stages of excavation,construction and normal use of foundation pit were clearly defined,and the finite element method and elastic fulcrum method applicable to the division limits of deep and deep foundation pits and their permanent supporting structures were suggested respectively.It is emphasized that durability analysis of support components should be carried out,and it is proved that the basement exterior wall of permanent support structure of geotechnical structural deep foundation pit is basically free from earth pressure,which changes the current situation that the support structure in the excavation stage and the basement exterior wall in the use stage bear soil pressure respectively,that is,twice the building materials resist soil pressure,and shows the engineering value of the permanent support structure in deep foundation pit and its popularization significance.
deep foundation pitstructural method of geotechniquepermanent support structuredurability
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