破裂面水压对砂板岩峰后强度影响的试验研究  

Experimental research on influence of pore pressure at fracture surface on post-peak strength of sandy slate

作　　者：任浩楠[1,2] 徐进[1,2] 刘建锋[1,2] 聂明[1,2] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点试验室,成都610065 [2]四川大学水利水电学院,成都610065

出　　处：《岩土力学》2013年第4期1053-1057,共5页Rock and Soil Mechanics

摘　　要：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。The triaxial compression experiments under different confining pressures/or santay slate samptes nave oeen conuuctcu oy 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.

关 键 词：砂板岩 破裂岩体 峰后强度 饱和软化 水压弱化 

分 类 号：TU452[建筑科学—岩土工程]