含两组叠置X型裂隙类岩石材料单轴拉伸破坏特征  

Uniaxial tensile failure properties of rock-like specimens with two overlapped X-type flaws

作　　者：张波[1,2] 杨学英[3] 李术才[1,2] 郭帅[1] 唐鹏越 李海燕 杨磊[2] 孙怀凤[2] 王书刚[2] ZHANG Bo YANG Xueying LI Shucai GUO Shuai TANG Pengyue LI Haiyan YANG Lei SUN Huaifeng WANG Shugang(School of Civil Engineering, Shandong University, Jinan 250061, China Research Center of Geotechnical and Structural Engineering, Shandong Univer- sity, Jinan 250061, China Department of Engineering Management, Shandong Urban Construction Vocational College, Jinan 250014, China)

机构地区：[1]山东大学土建与水利学院,山东济南250061 [2]山东大学岩土与结构工程研究中心,山东济南250061 [3]山东城市建设职业学院工程管理系,山东济南250014

出　　处：《煤炭学报》2017年第8期1987-1993,共7页Journal of China Coal Society

基　　金：国家自然科学基金面上资助项目(51379114;41672281);国家自然科学基金青年基金资助项目(51509146)

摘　　要：含裂隙岩石/类岩石试件在单轴压缩下的破坏特征已有较多研究,但对含X型裂隙试件单轴拉伸下的破坏特征尚无研究结论。对含两组叠置X型裂隙类岩石材料试件进行了单轴拉伸试验,并与对应试件单轴压缩情况的已有实验结果进行了对比,研究了含两组叠置X型裂隙类岩石试件单轴拉伸下的岩桥贯通行为及强度特征。研究结果表明:含两组叠置X型裂隙类岩石材料试件在单轴拉、压作用下的破坏模式及岩桥贯通模式表现不同,在单轴拉伸作用下含两组叠置X型裂隙类岩石试件岩桥处不会出现贯通现象;含两组叠置X型裂隙类岩石材料试件的次裂隙位置影响试件单轴拉伸强度,在主裂隙位置固定情况下,次裂隙角度与最大拉应力方向垂直时试件强度最低,次裂隙角度与最大拉应力方向相同时试件强度最高。Although the failure properties of rock/rock-like specimens with flaws under uniaxial compression have been studied in many cases, those properties of specimens with X-type flaws under uniaxial tension have not been researched yet. In this research the crack coalescence and strength properties were studied with rock-like material specimens con- taining two overlapped X-type flaws under uniaxial tension tests. The testing results were compared with uniaxial com- pression results of specimens containing corresponding flaws. The study results show that the failure and coalescence modes of specimens with two overlapped X-type flaws under uniaxial tension tests are different from those with speci- mens under uniaxial compression tests. There is no crack coalescence at the rock bridge areas of specimens containing two overlapped X-type flaws under uniaxial tension tests. The position of the secondary flaw influences the strength of specimens containing two overlapped X-type flaws under uniaxial tension tests. The specimen with a second flaw verti- cal to the maximum tension stress has the lowest tension strength among specimens with two overlapped X-type flaws under uniaxial tension tests. The tension strength of the specimen with a second flaw parallel to the maximum tensionstress is the highest one among the specimens with two overlapped X-type flaws under uniaxial tension tests.

关 键 词：类岩石材料 X型裂隙 单轴拉伸 破坏特征 

分 类 号：TD313[矿业工程—矿井建设]