不同裂隙形式类岩体单轴压缩破坏特征研究  

Failure Characteristics of Rock-like Mass with Different Fracture Types under Uniaxial Compression

作　　者：孙冰 邹春海 曾晟[2] 方耀楚 王富林[2] SUN Bing;ZOU Chunhai;ZENG Sheng;FANG Yaochu;WANG Fu Lin(School of Civil Engineering,University of South China,Hengyang 421001,China;School of Nuclear Resources Engineering,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学土木工程学院,湖南衡阳421001 [2]南华大学核资源工程学院,湖南衡阳421001

出　　处：《防灾减灾工程学报》2018年第6期959-966,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金青年项目(51204098);湖南省科技厅重点研发计划项目(2015SK200584);湖南省教育厅科研项目(17C1355)资助

摘　　要：采用水泥砂浆制作具有不同倾角、不同裂隙形式和不同岩桥间距的预制裂隙类岩体试样,开展单轴压缩试验。基于滑动裂纹理论,分析在单轴压缩作用下类岩体破坏受力特征和破坏形式。结果表明:裂隙形式、裂隙倾角和岩桥长度等参数变化对试样强度和破坏形式有较大影响,且在不同破坏模式中起主要作用的控制性参数不一样;对于不同倾角的单裂隙和平行双裂隙试样在单轴压缩破坏形式基本类似,当倾角在0°~90°变化时,它们的峰值强度随倾角的变化趋势呈下凹型,当岩桥倾角为45°时试样的峰值强度最低;对于不同岩桥长度不共面断续裂隙试样,试样的抗压强度会随着岩桥长度的增大而逐渐增大,而对于共面断续裂隙试样裂隙岩桥长度为20mm左右时最容易被破坏。Prefabricated fractured rock-like samples with cracks of different dip angles,different assemblies and different spacings were prepared using cement mortar.Uniaxial compression tests were carried out.The failure characteristics and failure modes of rock mass under uniaxial compression were analyzed based on the sliding crack theory.The result shows that the crack form,dip angle and rock-bridge length have a great effect on the compressive strength and failure mode.But the control parameter which plays a major role in different failure modes is not the same.The uniaxial failure modes of specimens with single crack and parallel double cracks of different dip angles are similar.The curve of peak strength is concave when the dip angles range from 0°to90°.The peak strength reaches its minimum value when the dip angle of the rock bridge is 45°.The compressive strength of the samples with non-coplanar intermittent cracks increases with the rock-bridge length.The samples with coplanar intermittent cracks are prone to be destroyed at a rock-bridge length of 20 mm.

关 键 词：岩体 类岩材料 节理裂隙 单轴压缩 破坏模式 

分 类 号：TU452[建筑科学—岩土工程]