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本文探讨了确定岩石动、静力剪切强度的六种试验方法,并用这些方法,系统地研究了花岗岩、大理岩和砂岩的剪切强度。同时得出:①岩石的剪切强度随着加载速率的提高而明显增加(即动力剪切强度高于静力剪切强度)和随剪切面上正应力的增加而增加;②砂岩受400kg/cm~2围压作用时剪切强度会出现一个由增加变为减少的转变点,即砂岩由脆性变为柔性的转变点,当围压低于此值时,砂岩的剪切强度随围压的增加而提高;当围压高于此值时,其剪切强度随围压的增加而降低等结果。笔者还建议使用简易的冲剪法去确定岩石的动、静力剪切强度。
This paper discusses six test methods to determine the dynamic and static shear strengths of rock, and use these methods to systematically study the shear strength of granite, marble, and sandstone. At the same time, it is concluded that: 1 The shear strength of rock increases with the increase of the loading rate (ie, the dynamic shear strength is higher than the static shear strength) and increases with the increase of the normal stress on the shear surface; 2 The sandstone is subject to 400kg When the confining pressure is under confining pressure, the shear strength will change from an increasing point to a decreasing point, that is, the transition point from the brittle to the flexible. When the confining pressure is lower than this value, the shear strength of the sandstone will vary with the confining pressure. When the confining pressure is higher than this value, the shear strength decreases as the confining pressure increases. The author also suggests using a simple punching method to determine the rock’s dynamic and static shear strength.