基于能量原理的砂岩破坏准则研究
发布时间：2018-08-20 14:56
【摘要】：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。
[Abstract]:In order to analyze the influence of different pore water pressure conditions on the stress-strain relationship of sandstone, a conventional triaxial compression test of saturated sandstone with different confining pressure and pore water pressure was carried out by MTS812.03 rock testing machine. Based on the energy principle, the failure criterion of sandstone is derived and applied to numerical simulation. The results show that because the loading process of rock itself is a process of energy accumulation and release, the failure criterion derived from the principle of energy can better reflect the true situation of rock failure, and the influence coefficient of pore water pressure is introduced. In order to make up for the defects of the software which can not simulate the process of crack expansion caused by water pressure, it is concluded by comparison and analysis that the difference between the calculated value of energy failure criterion and the actual value is less than 5, while the maximum error between Drucker-Prager and Hoek-Brown criterion reaches 35.34% and 37.11% respectively. Therefore, it is correct and reasonable to deduce the rock failure criterion under the coupling of water and rock by using FLAC3D software based on the energy principle.
【作者单位】： 辽宁工程技术大学土木工程学院;鞍钢集团矿业设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51274109)
【分类号】：TD315
本文编号：2194047
[Abstract]:In order to analyze the influence of different pore water pressure conditions on the stress-strain relationship of sandstone, a conventional triaxial compression test of saturated sandstone with different confining pressure and pore water pressure was carried out by MTS812.03 rock testing machine. Based on the energy principle, the failure criterion of sandstone is derived and applied to numerical simulation. The results show that because the loading process of rock itself is a process of energy accumulation and release, the failure criterion derived from the principle of energy can better reflect the true situation of rock failure, and the influence coefficient of pore water pressure is introduced. In order to make up for the defects of the software which can not simulate the process of crack expansion caused by water pressure, it is concluded by comparison and analysis that the difference between the calculated value of energy failure criterion and the actual value is less than 5, while the maximum error between Drucker-Prager and Hoek-Brown criterion reaches 35.34% and 37.11% respectively. Therefore, it is correct and reasonable to deduce the rock failure criterion under the coupling of water and rock by using FLAC3D software based on the energy principle.
【作者单位】： 辽宁工程技术大学土木工程学院;鞍钢集团矿业设计研究院有限公司;
【基金】：国家自然科学基金资助项目(51274109)
【分类号】：TD315
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