含交叉多裂隙类岩石材料单轴压缩力学性能研究

doi:10.13722/j.cnki.jrme.2014.0876

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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.

Key words： rock mass intersecting multi-flaws uniaxial compression mechanical property rock-like material

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.0876 OR http://www.rockmech.org/EN/Y2015/V34/I09/19

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