基于能量原理盐岩的强度与破坏准则

讨论了盐岩变形过程中可释放弹性应变能与耗散能内在关系，并给出了基于弹性应变能的破坏准则。为了验证该准则的可行性，一方面利用Mohr准则、D-P准则、基于能量原理强度准则对围压分别为1、5、10、15 MPa一组三轴压缩试验进行了研究；另一方面，应用该准则对来源于其他文献的三轴试验数据就行了研究。研究结果表明，由于该准则仅需确定常规岩石力学参数，物理力学意义明确，试验值与理论值的相对误差较小，因此，该准则可作为盐岩破坏的判据。

Investigation on mechanical properties and failure criterion of salt rock based on energy principles

The relations between energy release and energy dissipation are discussed; on the basis of the relations, a criterion for structural failure of salt rock is proposed. In order to verify the viability of the criterion, on the one hand, mechanical properties of salt rock based on Mohr criterion, D-P criterion and energy principles under different confining pressures of 1 MPa, 5 MPa, 10 MPa and 15 MPa are investigated; on the other hand, the failure criterion based on energy principle is carried out to study the data of conventional triaxial compression from other documents; the rusults reveal that the criterion based on energy principle only needs conventional parameters of rock mechanics, has clear physico-mechanical properties, and small relative errors between tested and theoretical values; so that this criterion can be used as judgment of salt rock failure.