期刊论文

Experimental Study on Crack Evolution and Fracture Characteristics of Rocks with Prefabricated Cracks

中文

黄金科学技术

1005-2518

2020

28

03

421-429

10.11872/j.issn.1005-2518.2020.03.164

国家自然科学基金项目“微生物胶结砂岩型地浸铀矿山隔水层的抗渗性能试验及机理研究”（编号：51974163）； 湖南省教育厅重点科研基金项目“微波照射花岗岩型铀矿石热—力耦合作用机理及热裂断裂机制研究”（编号：18A248）联合资助；

本校为第一机构

裂隙岩体是自然界中普遍存在的工程岩体,在外力作用下易引起岩体结构破坏失稳而诱发工程故事。为此,基于相似理论制作了含十字交叉裂隙的类岩石试样,利用RMT-150B岩石力学试验机,对含有不同裂隙长度和裂隙倾角的类岩石试样进行单轴压缩试验,分析其裂隙演化规律和破裂特征。研究结果表明:含预制裂隙试样的抗压强度明显低于完整试块;当主裂隙长度一定时,裂隙岩样的峰值应力随次裂隙长度的增大而降低;当裂隙倾角为0°和60°时,裂隙岩样表现为拉伸型翼形裂纹的破坏形式;当裂隙倾角为30°和45°时,裂隙岩样表现为拉剪混合型裂纹的破坏形式,既有翼形裂纹,又有次生共面裂纹。

Fracture rock mass is a kind of engineering rock mass widely existing in nature,which is easy to cause structural failure and instability of rock mass and induce engineering accidents under the action of external force.Therefore,it is necessary to study the crack evolution law and the fracture instability mechanism of rock mass with prefabricated fractures.In this paper,a lot of rock-like samples with prefabricated crisscross cracks were made based on the similarity theory.The uniaxial compression test on the rock-like samples with different fr...