Method for calculating ultimate load of independent foundation in karst foundation

Abstract

The invention discloses a method for calculating the ultimate load of an independent foundation in a karst foundation. The method comprises the following steps of taking a covering layer and caving rock mass at the top of a karst cave as a study object; carrying out stress analysis on the caved rock mass at the top of the karst cave; establishing an additional stress condition on a rock-soil interface of a collapsed rock mass at the top of the karst cave; establishing a linear mathematical programming model for solving the limit load of the independent foundation in the karst foundation; and solving the linear mathematical programming model of the independent foundation limit load in the karst foundation to obtain the limit load of the independent foundation, so that the result of the independent foundation limit load obtained by the method is more accurate than that obtained by the traditional method.

Description

technical field [0001] The invention relates to a calculation method for the ultimate load of an independent foundation in a karst foundation, and belongs to the technical field of foundation bearing capacity analysis. Background technique [0002] In limestone areas, caves of a certain scale often appear in karst foundations, and the upper part of the caves is covered with a certain thickness of Quaternary loose soil layer. The independent foundation is often used as the foundation type of the superstructure on the surface of the covering layer. Under the load on the independent foundation, the karst caves in the lower part of the covering layer often collapse, which brings safety hazards to the construction and operation of the project. The independent foundation, the overburden and the collapsed rock mass at the top of the cave constitute a complex karst foundation system. If the ultimate load of the independent foundation can be accurately determined, it will provide a t...

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Problems solved by technology

[0003]Many scholars and engineers have carried out research on the collapse mechanism of karst caves, stability evaluation methods, critical thickness of karst cave roofs, etc., but there are the following deficiencies in the ultimate bearing capacity of karst foundations : (1) The load on the independent foundation is transmitted to the rock-soil interface through the covering layer, which leads to the collapse of the cave. This is a very complicated mechanical problem. (2) Insufficient research on the stress limit state of the collapsed rock mass at the top of the karst cave under the ultimate load on the independent foundation; (3) Solving the ultimate load of the independent foundation is a maximization However, the current research results all make some artificial assumptions on the foundation system, transform the hyperstatically indeterminate problem into a statically indeterminate problem and use the mathematical iteration method to solve it, which leads to a large error in the obtained ultimate load

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