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将不同规格的长方体花岗岩标本 ,按事先设计的图案布设多个电极 ,并用抽真空的方法将标本进行水饱和 .然后将标本电极面和相邻面的一小部分 (包括棱 )用防水绝缘胶密封 .用多电极组合法 ,将己布电极组合成不同方向、不同极距的电阻率各向异性测线和电测剖面、电测深测线 .使标本在装有水的承压水箱中 ,沿标本长轴方向受压 ,观测标本电阻率随压力的变化 .在实验中 ,一些标本被压坏 ,出现宏观裂隙 ;一些标本没有被压坏 ,没有被压坏的标本通常压到电阻率出现明显破裂前兆为止 .然后 ,将未压坏的标本测量面显微照相 ,从照片上寻找裂隙的优势方向 ,和被压坏标本的宏观裂隙一起 ,与电阻率各向异性计算结果进行对比 ,实验结果表明 :1裂隙和破碎带通过区域的测点 ,视电阻率变化各向异性结果好 ,4种组合求得的 4个各向异性主轴方向趋于一致 ,且与破碎带方向基本吻合 ;裂隙和破碎带不经过区域的测点 ,或者 4个视电阻率变化各向异性主轴方向不一致 ,或者根本求不出各向异性解 .这后一种情况 ,在裂隙面平行测量面时 ,表现最为明显 ;2显微照相显示的微观裂隙或破碎带的优势方向与电阻率变化最大的各向异性主轴方向基本一致 ;3电测剖面的结果 ,能较好地反映裂隙的位置和区域
The different specifications of the rectangular granite specimens, according to the design of the pattern layout of multiple electrodes, and the method of vacuum pumping the specimen water saturation.Then the specimen electrode surface and the adjacent surface of a small part (including the edge) with waterproof insulation Sealed with a combination of multi-electrode method, the cloth electrode is assembled into different directions, different polar distance resistivity anisotropy line and electrical cross-section, electrical sounding measurement line so that the specimen in the water tank with pressure , Along the long axis of the specimen under pressure to observe the specimen resistivity with pressure changes in the experiment, some specimens crushed, macroscopic fissures appear; some specimens are not crushed, not crushed specimen is usually pressed to the resistivity Then the obvious rupture precursors were observed.After that, the non-crushed specimens were photographed on the measuring surface to find the dominant direction of the cracks from the photographs, together with the macro-cracks of the crushed specimens, and compared with the resistivity anisotropy calculation results, The experimental results show that the anisotropy of apparent resistivity changes well with the measured points passing through the fissures and broken zones, and the directions of the four anisotropic principal axes obtained by the four kinds of assemblages tend to be consistent with each other With the direction of the basic agreement; fracture and fracture zone does not pass the measuring point of the area, or the four apparent anisotropy of apparent resistivity changes in the direction of the main axis is inconsistent, or no anisotropy solution. In the latter case, parallel to the fracture surface The most obvious anisotropy is the direction of anisotropy when the microscopic fracture or fracture zone shows the most resistivity change. The results of the electrical sectioning can better reflect the fracture Location and area