CAJ | 학술논문

水压会刺激岩石裂纹的产生和加速岩石破裂，对岩石的变形破坏特征和破坏机制有重要影响。利用MTS815 Flex Test GT 岩石力学试验系统和 PCI-Ⅱ声发射仪开展了砂岩在不同围压下的水-力耦合试验。结果表明：在整个岩石破裂过程中，声发射活动随加载时间、应力变化表现出不同的特征；声发射活动在岩石的峰后阶段随着水压的增大更为集中，强度也更高，而随着围压的增大其集中程度和强度都有所降低；在相同围压下，声发射累计振铃计数和累计能量随着水压的增大而增大，在相同水压下，声发射累计振铃计数和累计能量则随着围压增大而有所减少；随着水压的增大，岩石最终失稳破坏时刻的声发射三维定位图中裂纹数量增多，裂纹的集中程度也更高，在宏观破坏形态上表现出破坏角减小。这些成果揭示了水-力耦合作用下岩石的破坏机制由压制剪切向压制张裂变化，岩石破裂的脆性破坏特征增强。
수압회자격암석렬문적산생화가속암석파렬，대암석적변형파배특정화파배궤제유중요영향。이용MTS815 Flex Test GT 암석역학시험계통화 PCI-Ⅱ성발사의개전료사암재불동위압하적수-력우합시험。결과표명：재정개암석파렬과정중，성발사활동수가재시간、응력변화표현출불동적특정；성발사활동재암석적봉후계단수착수압적증대경위집중，강도야경고，이수착위압적증대기집중정도화강도도유소강저；재상동위압하，성발사루계진령계수화루계능량수착수압적증대이증대，재상동수압하，성발사루계진령계수화루계능량칙수착위압증대이유소감소；수착수압적증대，암석최종실은파배시각적성발사삼유정위도중렬문수량증다，렬문적집중정도야경고，재굉관파배형태상표현출파배각감소。저사성과게시료수-력우합작용하암석적파배궤제유압제전절향압제장렬변화，암석파렬적취성파배특정증강。
Water pressure could stimulate rock crack and accelerate the process of rock failure, this has an important influence on the deformation characteristics and failure mechanism of rock. A hydro-mechanical coupling test of sandy rock is conducted at different confining pressures by MTS815 Flex Test GT rock mechanics test system and PCI-Ⅱ acoustic emission (AE) system. The experimental results are displayed as follows: AE activity represents different characteristics with the loading time and stress changing during the total loading process. With the increase of water pressure, the AE activity is more concentrated and strength is higher after the stress reaches the peak strength of rock. But concentration and strength reduce with the increase of confining pressure. At the same confining pressure, the AE counts and energy increase as the water pressure increases. As the water pressure increases, the number of cracks enhances and the degree of concentration of crack is higher in the 3-D location of AE figures when the rock is unstable failure. At the same time, the failure angle decreases on the macroscopic failure morphology. These results reveal that the mechanism of rock failure changes from suppression of shear to suppression of tension rift;its plasticity is weakened and brittleness is enhanced under hydro-mechanical coupling process.