饱和土体串联与并联弹性力学模型

针对饱和土体中的串联与并联弹性力学模型，通过将固体中的应力分解为颗粒间应力和流体与颗粒的相互作用力，并且运用流体与颗粒间的作用力与反作用力相等，以及在不排水条件下土体总应变等于骨架的应变原理，对这两种模型的理论依据进行了证明和阐述。结果表明：饱和土体中的串联与并联弹性力学模型与Biot—Geerstma理论是一致的，且分别是该理论中弹性模量在骨架弹性模量为零和颗粒弹性压缩系数为零的两个特例；Terzaghi有效应力是“粒间应力”的平均值。

Serial and parallel elastic mechanical models of saturated soils

Based on serial and parallel elastic stressstrain models in saturated soils,the stress in solid is decomposed into two parts: one is among granules;the other is between granules and fluid.Under the conditions that the action force of fluid on granules equals the reaction force of granules on fluid,and the total strain equals the strain of skeleton when without drainage reaction in saturated soil,those two models are studied.It is found that both the models are identical with Biot-Geerstma theory,and Terzaghi effective stress should be regarded as the ratio of the stress among granules that are averaged by granules volume.6 refs.