A method for predicting settlement after vertical reinforcement of karst soil cave under subgrade

Abstract

The invention relates to a method for predicting the settlement amount of a karst soil cave treated by a vertical reinforcement under a roadbed. The method comprises the following steps that the geometric dimensions (length L, width W and height H) and the soil covering depth h of the karst soil cave are determined; the soil covering thickness Y above the bed rock is determined; the diameter d ofcylinders, the arrangement form and the separation distance l of the vertical reinforcement are determined; the compression modulus E of the cylinders and the compression modulus E<s> of a soil body around the soil cave are determined; the substitution rate M of the cylinders on the horizontal plane is determined; the composite compression modulus of the cylinders and the soil body is determined, and the soil filling height z<0> and the soil filling weight gamma of the roadbed are determined; the borne upper load magnitude p and the distribution width b of the roadbed are determined; the additional stress sigma <z> caused by the roadbed upper load in a foundation is determined; and the settlement amount S of the soil cave treated by the vertical reinforcement under the roadbed is determined. The method for predicting the settlement amount of the karst soil cave treated by the vertical reinforcement under the roadbed has the advantages of simple structure, high process performance and convenient implementation, and can predict the settlement amount of the karst soil cave treated by the vertical reinforcement reliably.

Description

Technical field: [0001] The invention belongs to the field of geological disaster regulation, and in particular relates to a method for predicting settlement after regulation of a vertical reinforcement body of a karst soil cave under a subgrade. 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 caves, among which setting vertical reinforcements inside is a more common method, such as pouring foam concrete and other materials into the soil caves through underground drilling, and vertical reinforcements are formed in the soil caves and above and ...

AI Technical Summary

Problems solved by technology

However, there is still no reliable prediction method for how large the subsidence will be after remediation.

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