对多孔介质双重有效应力理论的讨论

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。

Numerical simulation of blasting effect with divided charge structure

This paper numerically simulates the stress development and generates a three-dimensional model of the medium-length hole blasting in infinite rock mass for continuous charge and divided charge in blasting by using the large-scale nonlinear dynamic analysis software LS-DYNA and the elastic-plastic model ~*MAT_PLASTIC_KINEMATIC and JWO-EOS.The differences of the decreasing rate in Von Mises effective stress of blasting,element effective stress peak of free surface,bore wall stress and acceleration are investigated.It is shown that divided charge could greatly improve the blasting effect by engineering blasting practice.