Underground cavity analysis method considering nonlinear softening and dilation characteristics of surrounding rock

A technology of underground caverns and analysis methods, applied in the direction of analyzing materials, strength characteristics, measuring devices, etc., can solve problems such as nonlinear softening of surrounding rock, nonlinear shear deformation strength, etc.

Inactive Publication Date: 2015-05-06
张斌伟 +1
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Problems solved by technology

[0007] The purpose of the embodiment of the present invention is to provide an underground cavern analysis method that considers the nonlinear softening and dilatancy characteristics of the surroundi

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  • Underground cavity analysis method considering nonlinear softening and dilation characteristics of surrounding rock
  • Underground cavity analysis method considering nonlinear softening and dilation characteristics of surrounding rock
  • Underground cavity analysis method considering nonlinear softening and dilation characteristics of surrounding rock

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[0065] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0066] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0067] The specific embodiment of the present invention is: a certain underground project is located in marl rock with good quality, and excavates a channel whose end face is approximate to the original shape and whose radius is 4 meters. The uniaxial compressive strength of the rock block is 40MPa, E=4000Mpa, μ = 0.3, the empirical parameters of the original rock m = 3.43, s = 0.082; the empirical parameters of the damaged zone mr = 0.183, sr = 0.00009, the orig...

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Abstract

The invention discloses an underground cavity analysis method considering nonlinear softening and dilation characteristics of surrounding rock. According to the method, a hyperbolic softening model based on the characteristics of the Hoek-Brown criterion is established according to the characteristic that the strength parameter of the surrounding rock of a tunnel is weakened with the increasing of the strain of a plastic zone, the model is based on the characteristics of a resultant stress-strain curve of the surrounding rock, and reflects the nonlinear characteristics of the surrounding rock through example verification, the model is applied to analysis for the surrounding rock subjected to strain softening in underground construction, and a new method for an underground cavity analysis is established by considering the nonlinear softening and non-associated flow characteristics as well as a nonlinear failure criterion of a rock mass; the solutions of the stress of the underground cavity, the deformation of the cavity and the radius of the plastic zone are obtained; according to the method disclosed by the invention, the dilation characteristics of the surrounding rock are considered according to a non-associated flow criterion, and with regard to the deformations of the surrounding rock under different plastic models, application example results indicate that the strain dilation of a rock-soil material with dilation and strain softening is considered to be safe.

Description

technical field [0001] The invention belongs to the technical field of underground engineering analysis, and in particular relates to an analysis method for an underground cavern considering the nonlinear softening and dilation characteristics of surrounding rocks. Background technique [0002] At present, in the analysis of underground engineering, there are usually problems in the following aspects: [0003] (1) The analysis of underground structures such as tunnels can be regarded as a plane strain problem, but in fact, the surrounding rock is in a triaxial stress state. Since the simple shear strength criterion can only consider the maximum principal stress and the minimum principal stress, and completely ignores the intermediate principal stress Therefore, the effect of axial stress is not considered in mechanical analysis. However, a large number of rock triaxial tests have proved that the strength and failure of rock are not only related to the maximum principal stres...

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Application Information

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IPC IPC(8): G01N3/00
Inventor 张斌伟严松宏
Owner 张斌伟
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