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为了解砂岩在库水压力作用下的破坏形态特征,选取三峡库区秭归某滑坡区域砂岩为研究对象进行浸泡试验。试验采用自主设计的YRK-1型岩石溶解试验仪,设定0、0.4、0.8 MPa三种不同浸泡水压,并进行对比。对不同水压力下浸泡的砂岩在不同浸泡周期进行单轴和三轴压缩试验,得出了砂岩试样在不同情况下的宏观破坏形态特征。研究表明,随着浸泡时间增长,砂岩试样试验破坏时呈现如下规律:(1)砂岩试样在不同围压时都表现出破坏角逐渐减小并趋近于某一稳定值的规律,而且浸泡压力越大,减小的趋势越明显;(2)单轴压缩破坏时砂岩试样表面剪切裂纹逐渐变短,张拉裂纹逐渐变长,而且浸泡压力越大,变化趋势越明显。
In order to understand the destructive morphological characteristics of sandstone under the pressure of reservoir water, the sandstone in Zenggu landslide area in the Three Gorges Reservoir Area was chosen as the research object for the soaking experiment. Experiments using independent design YRK-1 Rock Dissolution Tester, set 0,0.4,0.8 MPa three different soaking water pressure, and compared. Uniaxial and triaxial compression tests were carried out on soaked sandstone under different water pressures in different immersion cycles, and macroscopic failure morphological characteristics of sandstone specimens were obtained under different conditions. The results show that with the increase of immersion time, the sandstone samples show the following rules when they are destroyed: (1) The sandstone samples show the regularity that the failure angle gradually decreases and approaches a certain stable value under different confining pressures, and (2) When the uniaxial compression failure, the shear cracks on the surface of sandstone specimens become shorter and the tension cracks become longer gradually, and the more the pressure of immersion, the more obvious the change trend.