A Prediction Method for Vertical Bearing Capacity of Vertical Reinforcement in Karst Cavern

Abstract

The invention relates to a method for predicting the vertical bearing capacity of a vertical reinforcement of a karst soil cavity. The method comprises the following steps that the geometric dimensions such as length L, width W and height H and the soil covering depth of the karst soil cavity are determined; the number n, depth L<0> and diameter d of grouting holes of the karst soil cavity are determined; the compressive strength sigma<s>, the ultimate side friction q<s> and the ultimate end resistance q of the vertical reinforcement are determined; a characteristic value f<ak> of the foundation bearing capacity of a soil body at the bottom of the soil cavity is determined; a net area A<c> of the bottom surface of an enlarged body is determined; the ultimate bearing capacity Q<u1> jointly determined by a cylinder and the enlarged body is determined; the ultimate bearing capacity Q<u2> determined by the compressive strength of the cylinder is determined; the ultimate bearing capacityQ<u3> determined only by the cylinder is determined; the vertical ultimate bearing capacity Q of the vertical reinforcement is determined; and the vertical design bearing capacity R of the vertical reinforcement is determined. The method for predicting the vertical bearing capacity of the vertical reinforcement of the karst soil cavity has the advantages of simple structure, high process performance and reliable result, and can predict the vertical bearing capacity of the vertical reinforcement of the karst soil cavity more reliably.

Description

Technical field: [0001] The invention belongs to the field of geological disaster control, and in particular relates to a method for predicting the vertical bearing capacity of a vertical reinforcement body of a karst soil cave. Background technique: [0002] Karst subsidence in my country is a common sudden geological disaster, once it occurs, it will be extremely destructive. Karst soil caves are generally covered inside the soil and have strong concealment, which is extremely unfavorable to engineering construction. Before the construction of the project, the karst soil cave needs to be treated to meet the requirements of bearing capacity, deformation and stability. There are many ways to deal with soil holes, among which setting vertical reinforcement inside is a more common method, such as pouring ordinary concrete, foam concrete and other materials into the soil hole through underground drilling, and forming vertical reinforcement in the soil hole and its upper and lo...

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Problems solved by technology

However, there is no reliable prediction method for the vertical bearing capacity after treatment.

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