School of Civil Engineering, Liaoning Technical University Mining Design and Research Institute Limited, Anshan
Iron and Steel Group

为了分析不同孔隙水压条件对砂岩应力-应变关系的影响,采用MTS812.03岩石试验机对饱和砂岩进行不同围压、孔隙水压常规三轴压缩试验,结合能量原理推导出适用于水岩耦合下砂岩破坏准则,并运用于数值模拟中进行分析验证。结果表明:由于岩石加载过程自身就是一个能量积聚与释放的过程,通过能量原理推导破坏准则,能更好地反映岩石破坏的真实情况,并通过引入孔隙水压影响系数,来弥补软件不能模拟由于水压造成的裂隙扩展过程的缺陷,最终通过对比分析得出,能量破坏准则的计算值与实际值相差小于5%,而Drucker-Prager与Hoek-Brown准则误差值最大达到了35.34%和37.11%。因此,利用FLAC3D软件通过基于能量原理推导出在水岩耦合作用下岩石的破坏准则是正确和合理的。

In order to analyze the different pore water pressure affected to the stress and strain relationship of the sandstone, an MTS812.03 rock test device was applied to the conventional triaxial compression test on the saturated sandstone under different confined pressure and pore water pressure. In combination with the ene rgy principle, the sandstone failure criterion suitable to the water and rock coupling was deduced and was applied to the numerical simulation for the analysis and verifi cation. The results showed that due to the rock loading process was an energy accumulation and releasing process, the failure criterion deduced with the energy princip le could well reflect the real condition of the rock failure. The introduction of the pore water pressure influence coefficient could make up the defect due to the software could not simulate the cracking expansion caused by the water pressure. Finally, the comparison analysis showed that the calculation value of the energy failure criterio n would be 5% smaller than the actual value and the error value of the Drucker-Prager and Hoek-Brown Criterions would be 35.34% and 37.11% in the max. Therefore, based on the energy principle criterion, the FLAC3 Dsoftware could be applied to deduce the rock failure criterion being correct and rational under the water and rock C oupling role.