Method and system for calculating vertical ultimate bearing capacity of karst cave crossing type socketed pile

Abstract

The invention discloses a method and system for calculating the vertical ultimate bearing capacity of a karst cave crossing type socketed pile. The calculation method comprises the following steps that physical and mechanical parameters of a foundation pile and a rock-soil body are determined; according to the physical and mechanical parameters, calculating the pile body limit side friction resistance in the overlying rock-soil layer, and calculating the total limit resistance of the rock-socketed section of the foundation pile; and calculating the minimum value of the sum of the pile body limit side friction resistance and the total limit resistance of the rock-socketed section and the axial compression failure limit load of the pile body to serve as the vertical limit bearing capacity PuR of the foundation pile. According to the method, the influence of the tension failure area of the karst cave roof on the bearing capacity is fully considered, meanwhile, the influence of the pile body failure mode on the bearing capacity is also considered, and the accuracy of calculating the vertical ultimate bearing capacity of the karst cave penetrating type socketed pile is improved.

Description

technical field [0001] The invention relates to the technical field of calculation of foundation pile bearing capacity, in particular to a method and system for calculating the vertical ultimate bearing capacity of rock-socketed piles passing through karst caves. Background technique [0002] Foundation piles have been widely used in engineering construction in karst areas. The existence of karst caves has brought a significant impact on the vertical ultimate bearing capacity of foundation piles. How to reasonably calculate the vertical bearing capacity of foundation piles in karst areas has become a key issue in the design of foundation piles. key scientific questions. [0003] The stress state of foundation piles passing through karst caves is relatively complex under the action of axial load, and karst caves have a significant impact on the force deformation law and potential instability mode of foundation piles passing through them. This effect is mainly reflected in the...

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Problems solved by technology

(2) Due to the existence of karst caves, the supporting function of the overlying rock and soil is reduced, which leads to significant changes in the self-weight stress field of the rock and soil layer, and the stress field around the pile body is also affected. There is a difference when compared with the cave

(3) There is no rock-soil mass lateral restraint around the pile passing through the karst cave or the lateral restraint is weak. Therefore, the lateral friction resistance of the pile body in the crossing section can be ignored. At the same time, due to the reduced lateral restraint of the pile body, Under the action of vertical load, the stability of the foundation pile itself is also reduced, thus affecting the vertical ultimate bearing capacity

Obviously, the results obtained by this calculation method are conservative

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