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Pit Supporting internal force calculation for the calculation of the single-stage type of support , with the development of China 's industry, the construction of railways, highways , especially in the construction of large industrial plants , mechanical equipment base at different depths during the foundation plant pit excavation , sometimes need a multi - level support , step-by-step excavation , thus reducing the amount of excavation and backfilling earthwork engineering , but the design of multi - level support for pit Supporting simply a reference to the design of single-stage support , without taking into account the superior support multi - level support to support at lower levels , which method about multi-level support earth pressure , force, displacement , etc. home and abroad do not mature , the calculation method of the system . This article from the classical Coulomb earth pressure theory proceed deduced multistage deep foundation supporting earth pressure formula calculation model , combined with my research internship in Guangzhou, a large steel plant foundation pit engineering examples , engineering instance data into the derivation of the multi-level supporting earth pressure formula , and the results to be analyzed , the superior support certain lower level support can be seen from the results obtained , but with all levels of support the care between excavation depth (H) and the platform width (W) are closely related . Against the the root piles of engineering instance in gravity retaining wall Taoda to enhance the retaining wall shear , bending strength , proposed Taoda root piles gravity retaining wall design theory and design steps . At the same time , the relevant project examples related to the multi-level support structure system Pit Excavation construction technology , and for similar projects in the future to provide a to calculate theoretical basis and construction experience .
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