Method for Determining Strength Parameters of Long and Weak Structural Plane

Abstract

The invention relates to a method of determining the strength parameters of a long and large weak structural plane. The invention aims to provide a method of determining the strength parameters of a long and large weak structural plane in order to effectively consider the contribution of fluctuation of a structural plane to the strength parameters. According to the technical scheme of the invention, particle flow parameters are inverted through field shear test, the space fluctuation characteristics of a structural plane in an excavation area are acquired through a 3D digital photographing technology to generate a space curved surface, models of different sizes are built, and thus, the strength parameters of the structural plane taking the size effect into consideration are acquired. By using the method, the contribution of fluctuation of a structural plane to the strength parameters can be considered effectively.

Description

technical field [0001] The invention relates to a method for determining the strength parameters of a grown and weak structural plane. Background technique [0002] For a structural plane with a trace length of more than 100m and a undulation height of more than 10cm, the strength parameters are often closely related to the degree of undulation of the structural plane. The test results cannot reflect the contribution of the undulation characteristics of the structural plane to the strength parameters. [0003] At present, there are mainly two methods for determining the strength parameters of structural planes: (1) on-site shear test; (2) empirical methods, these two methods are suitable for strength estimation of grade III or grade IV structural planes, and for thicker fillings on structural planes , For the second-level structural planes with a large degree of undulation, the above two methods tend to underestimate the strength parameters of the weak structural planes bec...

AI Technical Summary

Problems solved by technology

[0002] For structural surfaces with trace length exceeding 100m and undulation height exceeding 10cm, the strength parameters are often closely related to the degree of structural surface undulation. However, for conventional shear tests to determine the structural surface strength parameters, since the test size is generally 0.5m×0.5m The test results cannot reflect the contribution of structural surface undulations to the strength parameters

[0003] At present, the determination of structural surface strength parameters mainly relies on two methods: (1) on-site shear test; (2) empirical method, these two methods are suitable for the strength estimation of grade III or IV structural surface, for the structural surface filling is thicker 1. Class II structural surfaces with large structural surface fluctuations. The above two methods tend to underestimate the strength parameters of weak structural surfaces because they cannot effectively consider the structural surface fluctuation characteristics

Images