孔隙压力作用下多孔介质蠕变模型分析
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摘要
为了能够更加准确的模拟实际的多孔介质的蠕变情况,在考虑孔隙压力动态变化对多孔介质的流变变形具有相互影响的情况下将孔隙压力与变形之间存在的密切的相互作用关系引入到流变方程当中。由于传统的Terzaghi有效应力忽略了孔隙压力的变化与应变的相互影响,它无法较准确的描述多孔介质的应变行为,而采用孔隙压力与变形的动态关系描述可以更加模拟接近多孔介质的实际应变行为。并通过数值方法对所构造的包含动态孔隙压力的蠕变方程与传统的蠕变方程的结果进行对比,以突出动态孔隙压力方程的优越性。该成果使模拟实际的多孔介质的蠕变情况更为精确。
In order to simulate more accurately practical creep situation of porous media,based on the mutual effect between the dynamic changes of pore pressure and the rheological deformation of the porous media,the close and mutually influential relation between pore pressure and deformation was introduced into rheological equation.Because this mutual influence was neglected in the traditional effective stress of Terzaghi,the strain behaviour couldn't be exactly described.However,by taking into consideration the neglected relation,the actual strain behaviour closer to porous media can be simulated.Numerical computation was adopted to compare the results of creep equation of dynamic pore pressure and the results of traditional creep equation so as to highlight advantage of the equation of dynamic pore pressure.The achievement makes more accurate the simulated creep situation of practical porous media.
In order to simulate more accurately practical creep situation of porous media,based on the mutual effect between the dynamic changes of pore pressure and the rheological deformation of the porous media,the close and mutually influential relation between pore pressure and deformation was introduced into rheological equation.Because this mutual influence was neglected in the traditional effective stress of Terzaghi,the strain behaviour couldn't be exactly described.However,by taking into consideration the neglected relation,the actual strain behaviour closer to porous media can be simulated.Numerical computation was adopted to compare the results of creep equation of dynamic pore pressure and the results of traditional creep equation so as to highlight advantage of the equation of dynamic pore pressure.The achievement makes more accurate the simulated creep situation of practical porous media.
引文
[1]车用太,唐毅,等.不同结构的岩石试件变形破坏与孔隙压力关系的实验研究[J].中国地震.1995,4:333-339.
[2]李传亮.多孔介质应力关系方程[J].应用基础与工程科学学报,1998,6(2):146-148.
[3]李传亮,孔祥言,等.多孔介质的流变模型研究[J].力学学报,2003,35(2):230-233.
[4]袁龙蔚.流变力学[M].北京:科学出版社,1986.
[5]周维垣.高等岩石力学[M].北京:水利电力出版社,1990.
[6]范广勤.岩土工程流变力学[M].北京:煤炭工程出版社,1992.
[2]李传亮.多孔介质应力关系方程[J].应用基础与工程科学学报,1998,6(2):146-148.
[3]李传亮,孔祥言,等.多孔介质的流变模型研究[J].力学学报,2003,35(2):230-233.
[4]袁龙蔚.流变力学[M].北京:科学出版社,1986.
[5]周维垣.高等岩石力学[M].北京:水利电力出版社,1990.
[6]范广勤.岩土工程流变力学[M].北京:煤炭工程出版社,1992.
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