岩石三轴压缩任意围压下应力–应变曲线的预测方法研究

岩石三轴压缩试验中通常只做有限种围压情况下的压缩试验,得到的应力–应变曲线只是岩石在具体围压下本构关系的表现,限制了通过拟合应力–应变曲线得到岩石本构的实用性。认为不同围压下的应力–应变曲线虽然形状差别较大,但都是同种岩石所表现出来的特性,曲线间蕴含着一定联系。对此进行了研究,并提出一套基于有限种围压情况下的应力–应变曲线预测任意围压下应力–应变曲线的方法。通过实例,说明所提方法的可行性。

Forecast of stress-strain curves of rock under arbitrary confining pressures in triaxial compression

Generally,rock triaxial compression tests were done under limited different confining pressures.The stress-strain curves obtained under certain confining pressure reflected certain constitutive relation of the rock,and the practicability of studies on the constitutive relation of rock was limited to fitting stress-strain curves.It was considered that the stress-strain curves under different confining pressures were different greatly in shapes,but there should have be some relationship because these curves were the responses of the same rock.A method was proposed to forecast the stress-strain curves under arbitrary confining pressures based on the stress-strain curves obtained under the limited confining pressures.An example was studied,and it was shown that the proposed method was feasible.