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中文摘要：
为了掌握高压条件下颗粒破碎对粒状材料抗剪强度特性的影响，应用DRS-1型超高压直残剪试验系统，研究了法向应力0～14MPa条件下颗粒破碎对福建标准砂直接剪切强度的影响，分析了颗粒破碎的机理、过程及其力学效应．结果表明，14MPa条件下砂的相对破碎与法向应力之间呈二次函数关系，其内摩擦角随相对破碎的增加呈负指数函数减小，达到临界相对破碎值（约7％～9％）后，不再减小，稳定值为28．9^o．高压条件下砂的颗粒破碎与塑性功成线性关系，颗粒破碎是砂在高压条件下剪切特性非线性的根本原因．
英文摘要：
The influence of particle crushing on the shear strength of granular materials was studied using DRS-1 super-high-pressure direct/residual shear testing system. Fujian Standard Sand was tested under normal stress from 0 to 14 MPa and the mechanism, process and effects of particle crushing were evaluated. The results show that under a 14 MPa stress the relationship between the extent of crushing and the normal stress on the sand is a quadratic function. As the extent of crushing is increased the internal friction angle of the sand decreases until a critical crushing value （about 7 to 9 percent） is reached; After this the angle remains stable at about 28. 9 degrees. The data show a linear function between particle crushing and plastic work at high pressure and suggest that particle crushing is the prime cause of the nonlinear response of sand to high pressure.
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