Method for testing permeability characteristic and bearing capacity of deep-buried high-pressure grouting tunnel surrounding rock

Abstract

The invention discloses a method for testing permeability characteristic and bearing capacity of deep-buried high-pressure grouting tunnel surrounding rock . According to the method, a deep-buried high-pressure tunnel crack surrounding rock real damage crack network is simulated based on Monte-Carlo; a rock mass structural plane virtual model is reconstructed reversely by adopting a fracture network, and 3D printing is carried out to obtain a rock mass structural plane test sample; a printed rock mass sample is grouted by adopting high-pressure water gushing, grouting and water plugging; and permeability and bearing capacity of the grouting fractured rock mass sample are tested in a full-automatic triaxial mechanical servo experiment system; and comparative analysis is carried out on dataand images obtained by performing CT (computed tomography) electron microscope scanning on the rock mass test piece subjected to the triaxial mechanical experiment to obtain the change rule of the internal structure of the rock mass test piece. The permeability characteristic and the bearing capacity of the grouting crack surrounding rock are obtained through analysis, the method is applied to deep-buried high-pressure tunnel grouting crack surrounding rock engineering, the stability of the internal structure of the tunnel excavation grouting crack surrounding rock is detected, and the safetyof tunnel excavation construction is improved.

Description

technical field [0001] The invention relates to a grouting method for a deep-buried high-pressure tunnel, in particular to a method for testing the permeability characteristics and bearing capacity of the surrounding rock of the grouting fissure in the deep-buried high-pressure tunnel. Background technique [0002] In the practice of geotechnical engineering, due to the complex geological conditions and the deep burial of high-pressure tunnels, hole wall collapse and water gushing are prone to occur during construction. Grouting technology is mostly used to increase the bearing capacity of rock mass and structural stability. However, as far as the current construction technology and technology are concerned, the conventional drilling and grouting plugging method is more difficult to construct in the tunnel, the safety of the construction personnel cannot be guaranteed, the construction progress cannot be guaranteed, and the construction effect is difficult to accurately grasp...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The present invention provides a method for testing the permeability characteristics and bearing capacity of the surrounding rock of a deep-buried high-pressure grouting tunnel, so as to overcome the technical problems in the prior art that the construction in the tunnel is difficult and the construction effect is difficult to accurately grasp

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