Rate correlation and deformation of damage evolutionof non-penetrating fractured rock masses

被引：0

作者：

Deng Z. ^{[1
,2
]}

Xiang S. ^{[3
]}

Zhou J. ^{[1
]}

Wang G. ^{[1
,2
]}

Wang Y. ^{[4
]}

机构：

[1] School of Architecture and Surveying Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi

[2] Jiangxi Key Laboratory of Environmental Geotechnical and Engineering Disaster Control, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi

[3] Shenzhen Survey and Mapping Research Institute Co., Ltd., Shenzhen, 518000, Guangdong

[4] College of Applied Science, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi

来源：

Baozha Yu Chongji/Explosion and Shock Waves | 2019年 / 39卷 / 08期

关键词：

Constitutive model; Damage evolution; Fractured rock mass; Non-through; Strain rate;

D O I：

10.11883/bzycj-2018-0391

中图分类号：

学科分类号：

摘要：

The non-penetrating fractured rock mass is the main form of rock mass in nature, and the geometric features of its fractures play a remarkable role in its strength and deformation. Its strain rate also has a significant rate dependence on its damage evolution and viscous effects. Firstly, using the model element method, we treated the dynamic failure process of non-penetrating fractured rock mass as a heterogeneous point with composite damage, static elastic properties and dynamic viscous properties, and improved the Maxwell body that responds to viscoelasticity. Then we combined the meso-damaged body and the macroscopic damage body of fracture damage evolutions into a macro-microscopic composite damage body following the equivalent strain hypothesis and constructed a dynamic damage model considering the macroscopic and microscopic defects of the rock mass. Furthermore, based on the fracture mechanics and strain energy theory, we analyzed the energy mechanism of the macroscopic fracture dynamic expansion of rock mass and obtained the calculation formula of the macroscopic dynamic damage variable of the fractured rock mass, with the initial fracture strain energy, the strain energy of the crack dynamic damage evolution process and the fracture closed strain energy, taken into consideration. Finally, we compared the results from the model calculation with those from experiment and found them in good agreement, thereby proving the rationality of the model. At the same time, we also discussed the influence of fracture inclination, strain rate and rock properties on rock mass deformation characteristics using the model. © 2019, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.

引用

共 24 条

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