CAJ | 학술논문

在MTS815 Flex Test GT岩石力学试验系统上进行不同围压下砂板岩三轴压缩全过程试验,并测试破裂岩体试样峰后的天然含水状态强度.对试样破裂面施加4级动水压力和静水压力,分别获得天然含水状态和每级水压下破裂岩体试样的强度.试验结果及分析表明,水对破裂岩体强度影响的作用机制主要表现在饱和软化与水压弱化两方面,即饱和软化作用不随水压的增减而变化和水压力对强度的弱化作用随水压升高而线性增大;主要影响强度参数中的黏聚力,对内摩擦系数的影响较小;裂隙岩体中静水压力的弱化作用强于动水压力.试验与分析还获得水对裂隙岩体的饱和软化以及静水压力综合作用的定量表达,并对这些成果的工程应用进行讨论.
재MTS815 Flex Test GT암석역학시험계통상진행불동위압하사판암삼축압축전과정시험,병측시파렬암체시양봉후적천연함수상태강도.대시양파렬면시가4급동수압력화정수압력,분별획득천연함수상태화매급수압하파렬암체시양적강도.시험결과급분석표명,수대파렬암체강도영향적작용궤제주요표현재포화연화여수압약화량방면,즉포화연화작용불수수압적증감이변화화수압력대강도적약화작용수수압승고이선성증대;주요영향강도삼수중적점취력,대내마찰계수적영향교소;렬극암체중정수압력적약화작용강우동수압력.시험여분석환획득수대렬극암체적포화연화이급정수압력종합작용적정량표체,병대저사성과적공정응용진행토론.
The triaxial compression experiments under different confining pressures for sandy slate samples have been conducted by MTS815 Flex Test GT rock mechanics test system. The anhydrous post-peak strength of the cracked rock mass is tested during the experiment. Then the residual strength of the cracked rock mass under different pore pressures is obtained by applying 4-levels dynamic and static pore pressures on the crack surface of the samples. The experiment results show that the mechanism of the influence on the strength of cracked rock mass caused by water mainly includes following aspects: saturated softening and pore pressure weakening. The saturated softening affection does not change with the changes of pore pressure; and the pore pressure weakening affection increases with the increasing of pore pressure linearly;which mainly influences the cohesive force while almost no effect on the internal friction coefficient. The weakening affection of static pore pressure is stronger than dynamic pore pressure’s. Through testing and analysis, the quantitative expression of the comprehensive effect of saturated softening affection and pore pressure weaken affection on cracked rock mass is obtained;and the engineering application of such results is discussed.