Calculation Method of Safe Thickness of Bearing Layer of Pile Foundation in Karst Area
A technology of safety thickness and calculation method, applied in calculation, special data processing application, instrument, etc., can solve problems such as not considering the influence of self-weight structure
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[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0054] 1. Theoretical basis:
[0055] Assumption: In order to facilitate the analysis of the mechanism of action between the pile foundation and the karst roof, the two can be considered as a system. Considering that the failure of the karst roof is a typical brittle failure, which is safer, the model can be simplified to a rectangular plate subject to a mid-span concentrated load model (see figure 1), the roof strata generally may have three modes of punching failure, shear failure and bending-tension failure. And make the following basic assumptions:
[0056] (1) The rock mass around the cave is a continuous linear elastic body and the time effect is not considered, and the cave is stable in the natural state; (2) The rock mass around the cave is a uniform isotropic material; (3) The analysis does not include the The beneficial effects of fillings ...
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