Method for calculating minimum thickness of karst cave top plate of karst pile foundation

Abstract

The invention discloses a method for calculating the minimum thickness of a karst cave top plate of a karst pile foundation. The method comprises the following steps: step 1, drawing up basic parameters for calculating the minimum thickness of the karst cave top plate of the karst pile foundation; step 2, carrying out stress analysis on the karst pile foundation; 3, establishing a nonlinear mathematical programming model for solving the minimum thickness of the karst pile foundation karst cave roof; and 4, solving the nonlinear mathematical programming model of the minimum thickness of the karst pile foundation karst cave top plate to obtain the minimum thickness of the karst pile foundation top plate. According to the method, a nonlinear mathematical programming model for solving the minimum thickness of the karst pile foundation karst cave top plate is established, shear failure and tensile failure of a karst cave top plate failure surface are considered at the same time, and the minimum thickness of the karst pile foundation karst cave top plate is sought in combination with a nonlinear mathematical programming algorithm; compared with a traditional method, the method is rigorous in theory, the solved result is more accurate, and programming is simple.

Description

technical field [0001] The invention relates to a method for calculating the minimum thickness of a karst cave roof of a karst pile foundation, and belongs to the technical field of foundation bearing capacity analysis. Background technique [0002] Southwest China is a karst development area, and karst phenomena such as karst caves, dissolution fissures, and soil caves exist in the karst development area, which adversely affects the stability of karst foundations. With the increasing scale of infrastructure construction in my country, the sites of many structure foundations are located in karst development areas; when there is a thick overburden in the karst site, and the strength of the overburden is low, it cannot be directly used as a bearing layer. , the pile foundation is often used as the foundation type for construction. However, due to the development of karst in the site, there are caves of a certain scale in the karst layer below the overburden. When the foundatio...

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Problems solved by technology

[0003] At present, there is no calculation method for the minimum thickness of the karst cave roof of the karst pile foundation foundation. It is urgent to establish a theoretical method and a mathematical model to solve the minimum safe thickness of the karst cave roof under the action of the pile foundation, so as to be able to quantitatively and accurately evaluate the safety of the karst pile foundation foundation. provide theoretical guidance for the design of karst pile foundation foundation

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