A Numerical Model Construction Method for Cave Karst Rock Mass

Abstract

The invention discloses a construction method of a finite-element numerical model of a cave-type karst rock mass. The method includes: determining a mass karst rate, a range of a karst cave location, a distribution law of a karst cave size and a probability density function thereof according to engineering investigation and geophysical prospecting; on the basis of a Monte Carlo method, determining the karst cave location and determining the karst cave size to generate a karst cave, and testing, through the mass karst rate, whether a model meets requirements; and finally giving physical and mechanical parameters of rocks to a medium region, and giving physical and mechanical parameters of known inclusions in the karst cave to a karst cave region to obtain the finite-element numerical model of the to-be-analyzed cave-type karst rock mass. The cave-type karst rock mass model provided by the invention can flexibly describe distribution characteristics of a karst cave in practical engineering, and fully and accurately describe a karst rock mass with a karst cave distribution, has a stronger adaptability, and has a very important significance for evaluation of karst-area foundation, study of karst-area leakage laws, research of karst-area tunnel construction and the like.

Description

technical field [0001] The invention relates to the technical fields of underground engineering and geotechnical engineering, in particular to a method for constructing a finite element numerical model of a cave-type karst rock mass. Background technique [0002] In addition to weak structural planes, soluble rocks also have karst structures that affect the stability of rock mass, thus forming karst rock mass. The karst structure has irregular characteristics, so it can be considered that the karst rock mass is a very heterogeneous rock mass. The distribution of these karst structures has become the main factor affecting the mechanical properties and stability of rock mass engineering. [0003] Karst is divided into three forms: cave type, fissure type and pipe type. Cave type refers to developed dry caves or filled caves, fissure type refers to karst fissures formed by dissolution of various structural fissures, and pipe type refers to karst After further dissolution, the...

AI Technical Summary

Problems solved by technology

In the prior art, many studies only focus on a single karst cave, which can only be used to analyze the impact of the karst cave on the surrounding rock mass

However, the shape and size of karst are different, and the distribution is complex. The current model cannot accurately describe the rock mass in the karst-developed area.

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