岩土工程学报2016，Vol.38Issue(7)：1212-1220,9.DOI:10.11779/CJGE201607007
断续裂隙类岩石材料三轴压缩力学特性试验研究
Experimental study on mechanical behavior of rock-like materials containing pre-existing intermittent fissures under triaxial compression
摘要
Abstract
It is of important practical significance for ensuring the stability of fractured rock engineering to investigate the influence of pre-existing fissures on the mechanical behavior of rock under three-dimensional stress.The rock-like material specimens containing two unparallel open penetrating fissuresare fabricated in the laboratory. And then a series of conventional triaxial compressive testson rock-like material specimensare carried out byusing theMTS815.02 rock mechanics servo-controlled testing system. On the basis of experimental results, the stress-strain curves, strength and deformation parameters and failure modesare analyzed. The main conclusionsare drawn as follows:(1)The stress-strain curves of pre-fissured specimens show multi-step softening, and some curveshave two peak strengths;(2)The peak strength, crack damage threshold and peak axial strain of intact and pre-fissured specimens all increase linearly with the increase of confining pressure. The sensitivity to the confining pressure of intactspecimen is the highest, and the sensitivity of pre-fissured specimens decreases from fissure angle 45° to 30° and then to 60°;(3) The failure modes of pre-fissured specimens are determined bythefissure angle and confining pressure. When the confining pressure is smaller, it is mainly affected bythefissure angle. Whereas the confining pressure is higher, which is mainly influenced bytheconfining pressure, and the rock specimens exhibit ashear mode.关键词
岩石力学/不平行双裂隙/强度特征/破裂模式/围压Key words
rock mechanics/two unparallel fissures/strength property/failure mode/confining pressure分类
土木建筑引用本文复制引用
黄彦华,杨圣奇,鞠杨,周小平,高峰..断续裂隙类岩石材料三轴压缩力学特性试验研究[J].岩土工程学报,2016,38(7):1212-1220,9.基金项目
江苏省杰出青年基金项目（BK20150005）；国家自然科学基金面上项目（41272344）；2014江苏省双创团队项目 （）
