Construction method of rock mass power function type microscopic season cracking three-dimensional model

Abstract

The invention relates to a construction method of a rock mass power function type microscopic season cracking three-dimensional model. The method comprises a construction process of a rock mass microscopic particle bond stress three-dimensional mode considering a crankle contribution factor, a three-dimensional power function type mode considering the microscopic particle bond season degradation attenuation of the crankle contribution factor, a Mohr-Coulomb microscopic particle bond season cracking criteria considering a crankle contribution effect and with stretch cutoff limit, and a microscopic particle linear contact three-dimensional model considering a damping effect. The method provided by the invention is applicable to the rock masses in which the relation between stress and crack speed in a three-dimensional stress space condition conforms to a power function type, and provides technical support to the long-term stability prediction, evaluation and optimization design of surrounding rock of the deep rock mass engineering in a three-dimensional stress condition.

Description

technical field [0001] The invention relates to the technical field of three-dimensional mesoscopic aging fracture analysis of engineering rock mass, in particular to a method for constructing a three-dimensional model of rock mass power function type mesoscopic aging fracture. Background technique [0002] Instability and destruction of deep rock mass engineering after excavation often do not occur immediately after excavation. Generally, there are obvious timeliness of deformation and rupture and hysteresis of catastrophe (such as rockburst, large deformation, etc.), which seriously endangers engineering. construction safety and long-term operation. At present, there are relatively few research results on time-efficiency mechanics in the mesoscopic aspect. In the article "Particle Flow Simulation of Time Effect of Fracture Expansion of Deep Buried Marble Rock", the experiment and two-dimensional numerical analysis of the time effect of Jinping marble fracture were carried...

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Problems solved by technology

In addition, this type of model also has the following shortcomings: (1) The shear fracture criterion between particles is a horizontal line parallel to the normal stress of the parallel bond, that is, the shear rupture criterion is consistent with the normal stress state of the parallel bond Irrelevant, as long as the parallel bond shear stress is greater than or equal to the fixed parallel bond shear rupture strength, shear fracture can occur between particles, which cannot reflect that different parallel bond normal stresses in the rock mass have different parallel bond shear rupture strengths (2) The influence of the difference in bonding torque on contact failure is not considered, and the contribution of bonding torque to different lithologies is considered to be consistent; (3) For the relationship between stress and crack growth rate This type of model lacks adaptability to rock mass that does not conform to the exponential expression method; (4) For deep rock mass engineering problems that must be considered under the condition of three-dimensional stress, this type of two-dimensional model cannot describe the effect of three-dimensional stress on rock mass deformation and damage over time. impact, but also the lack of adaptability

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