三轴压缩下大理岩剪切断裂能的测定

THE DETERMINATION OF SHEAR FRACTURE ENERGY OF MARBLE UNDER TRIAXIAL COMPRESSION

本文采用山东掖县大理岩岩样,在800t高温高压伺服三轴流变仪上,对大理岩在室温和不同国压条件下进行连续加载和循环加载实验,并用Rice提出的滑动弱化模型,分别对大理岩在上述围压和加载条件下的剪切断裂能进行测定和计算,得到了在不同围压下大理岩剪切断裂能的变化情况,以及加载方式对大理岩剪切断裂能造成的影响,并对所得结果进行了初步分析和讨论.

A series of monotonic and cyclic loading experiments of Shandong Yiexian Marble are performed on the 800t. High Temperature and High Pressure Servocontrolled Triaxial Reholo-gy Appratus with the confining pressure from 10 to 200 MPa and room temperature. Applying the slip-weakening model, we calculated the shear fracture energy(G) by integrating the curve transformed from the post-failure stress strain record. The results show that the influence of pressure and loading condition can change the shear fracture energy greatly. Finally, we discussed this problem and give our preliminary explanation.