围压卸载对岩石力学性能影响的试验研究

Test Study on Influence of Confining Pressure Relief upon Mechanical Properties of Rock

对花岗岩在不同围压条件下的卸载及围压卸载引起的岩石损伤进行试验研究,着重研究了围压卸载速率对岩石强度及损伤的影响。研究表明:围压卸载速率直接影响岩石的破坏形态,围压卸载速率越大,试件破坏时对应的围压值越低,相同条件下对岩石造成的损伤越小。

Test study was made on the granite damage caused by unloading and confining pressure relief under the condition of different confining pressures, emphatically on the influence of confining pressure relief rate on the rock strength and damage. Study indicated that the confining pressure relief rate has direct influence on the damage form of rock, the larger the confining pressure relief rate, the lower the corresponding confining pressure value while the specimen damaging, and the smaller the rock damage caused by the confining pressure relief under the same condition.