THE UNIAXIAL COMPRESSION MECHANICAL PROPERTY OF ROCK-LIKE MATERIAL WITH INTERSECTING MULTI-FLAWS
ZHANG Bo1，2，3，LI Shucai1，3，YANG Xueying4，ZHANG DunfuP1，WANG Qi3，CAI Wei1，
YANG Chunxiao1，DENG Zhenquan1
(1. School of Civil and Hydraulic Engineering，Shandong University，Jinan 250061，China；2. State Key Laboratory Breeding Base for Mining Disaster Prevention and Control，Shandong University of Science and Technology，Qingdao Shandong 266590，China； 3. Research Center of Geotechnical and Structural Engineering，Shandong University，Jinan 250061，China；4. Engineering Management Department，Shandong Urban Construction Vocational College，Jinan 250014，China；
5. Longkou Coal-electric CO. Ltd，Longkou 265700，China)
Abstract：In this work the uniaxial compression mechanical property of rock mass with intersecting multi-flaws are studied with rock-like material specimens. There are two kinds of intersecting multi-flaws taken into consideration--one comprises the main flaw and the secondary flaws，the other one is composed of multi-flaws with the same length of main flaw. The specimens are tested under the uniaxial compression situation. The test results show that：(1) When there are 2 intersecting flaws，the strength of specimen with intersecting multi-flaws is higher than that of specimen with a single flaw. When there are more than 2 intersecting flaws，the strength values of specimen with intersecting multi-flaws composed of a main flaw and secondary flaws are almost same with that of specimen with a single flaw. When there are more than 2 intersecting flaws and the flaws have the same length with the main flaw，the strength and the work to make the specimen failure are less than those of specimen with a single flaw. (2) The increasing number of secondary flaws has little influence on the strength of specimen with intersecting multi-flaws composed of a main flaw and secondary flaws，the increasing number of flaws have great influence on the strength of specimen with intersecting multi-flaws composed of flaws with the same length to main flaw. (3) Most of the strain values correspondent to the strength peak of specimens with intersecting multi-flaws are lower than that of specimen with a single flaw. (4) The fracture initial stress values of specimen with intersecting multi-flaws composed of a main flaw and secondary flaws are higher than that of specimen with a single flaw. Most of the fracture initial stress values of specimens with intersecting multi-flaws composed of flaws with the same length of main flaw are lower than that of specimen with a single flaw. (5) The failure surface of specimen with a single flaw is shear crack，and most of failure surfaces of specimens with intersecting multi-flaws are tense cracks.
2015, Vol. 34 
