Three-dimensional model of rock mass power function mesoscopic time-dependent fracture

Abstract

The invention relates to a rock mass power function type microscopic season cracking three-dimensional model. The three-dimensional model comprises a rock mass microscopic particle bonding stress three-dimensional mode giving a consideration to a twisted contribution factor, a microscopic particle bonding season deterioration attenuation three-dimensional power function mode giving the consideration to the twisted contribution factor, a Mohr-Coulomb microscopic particle bonding season cracking criterion giving the consideration to twisted contribution effect and provided with tension cut-off limit, and a microscopic particle linear contact three-dimensional model giving the consideration to damping effect. The rock mass power function type microscopic season cracking three-dimensional model is suitable for the rock mass, and the relation between the stress and the crack expansion speed of the rock mass is in accordance with the power function under a three-dimensional stress space condition, and is used to provide technical support for surrounding rock long-term stability prediction, evaluation, and design optimization of deep rock mass engineering under the 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 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 the Time Effect of Fracture Expansion of Deep Buried Marble", the experiment and two-dimensional numerical analysis were carried out on the time effect of Jinping marble rupture (Journal of Rock Mechan...

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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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