对多孔介质双重有效应力理论的讨论

Discussion on the Theory of the Double Effective Stresses of Porous Medium

李传亮先生提出的双重有效应力理论认为,受挤压的多孔介质承受两种应力,即本体有效应力和结构有效应力,二者分别决定多孔介质的本体变形和结构变形。针对上述理论,采用力学分析的方法研究了多孔介质变形的机理。结果表明,多孔介质的本体变形实质为弹性变形,它并不取决于本体有效应力,而取决于外加应力、粒间接触应力、流体压力的大小及其分布;多孔介质的结构变形并不取决于结构有效应力,而取决于外加应力、粒间接触应力、流体压力、粒间摩擦应力、粒间黏着应力的大小及其分布。显然,"双重有效应力"的作用被夸大了。

The main idea of the theory of the ＂double effective stresses＂ in porous medium proposed by Dr.LI Chuanliang is that porous medium,under force,bear two stresses that are ＂primary effective stress＂ and ＂structural effective stress＂,which controls the elastic deformation and the structural deformation,respectively.The mechanism of porous medium deformation is researched based on mechanical analysis.The result indicates that the concept of the ＂primary deformation＂ is not suitable,which may be replaced by ＂elastic deformation＂.And the above ＂elastic deformation＂ does not depend on the ＂elastic effective stress＂ but the value of extra stress,value of intergranular contact stress,value of fluid pressure and the distribution of the above stresses; and the structural deformation does not depend on the ＂structural effective stress＂ but the value of extra stress,value of intergranular contact stress,value of fluid pressure,value of intergranular friction stress,value of intergranular bonding stress and the distribution of the above stresses.The immature and controversial theory of ＂double effective stresses＂ is apparently exaggerated.