A simulation study on strength and crack propagation characteristics of layered composite rock with single fissure

被引：0
作者：
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou [1 ]
221008, China
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao | / 3卷 / 608-621期
关键词：
Crack propagation; Layered composite rock; RFPA[!sup]2D[!/sup; Single fissure;
D O I：
10.16058/j.issn.1005-0930.2015.03.019
中图分类号：
学科分类号：
摘要：
Similar to the monotonous rock, there are also exist fissures in the layered composite rock, which composed with materials varied with different mechanical properties, its mechanical properties and crack extension and failure mode are not the same as monotonous rock. This paper firstly establishes a layered composite rock model by way of a simulation test which produced two rock materials with different mechanical properties, high strength rock(hard rock) and low strength rock(soft rock) respectively. By changing the angle (β) between the intercalation of layered composite rock strata and the direction of loading force, this paper investigated the change rule of macroscopic mechanical properties such as strength, elastic modulus, for the three groups which layered composite rock strata with no-fissure, fissure angle α=45° and fissure angle α=135°, with β varied from 0°-90°. This study also obtains the extension process of single fissure in the layered composite rock strata with β varied from 0°-90°, as well as the fracture penetration and failure mode. Finally, through the acoustic emission(AE) analysis in the process of simulation test, this paper investigates the internal changes of layered composite rock strata in the process of single fracture extension, and, analyzed the failure mechanisms of hard and soft layered composite rock strata with single fissure under the axial compression test, and has made the preliminary test for the subsequent study. ©, 2015, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：608 / 621
页数：13
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