INSTABILITY AND DISPERSIVITY OF WAVE PROPAGATION IN INELASTIC SATURATED/UNSATURA

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INSTABILITY AND DISPERSIVITY OF WAVE PROPAGATION IN INELASTIC SATURATED/UNSATURATED POROUS MEDIA

A model based on the Biot theory for simulating coupled hydro-dynamic behavior in saturated-unsaturated porous media was utilized with integration of the inertial coupling effect between the solid-fluid phases of the media into the model. Stationary instability and dispersivity of wave propagation in the media in one-dimensional problem were analyzed.The effects of the following factors on stationary instability and dispersivity were discussed.They are the viscous and inertial couplings between the solid and the fluid phases,compressibility of the mixture composed of solid grains and pore fluid, the degree of saturation, visco-plastic (rate dependent inelastic ) constitutive behavior of the solid skeleton under high strain rate. The results and conclusion obtained by the present work will provide some bases or clues for overcoming the difficulties in numerical modelling of wave propagation in the media subjected to strong and shock loading.

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作 者: 李锡夔 张俊波 张洪武  
作者单位:State Key Laboratory for Structural Analysis of Industrial Equipment,Dalian University of Technology, Dalian 116024, P R China 
刊 名:应用数学和力学(英文版)  EI SCI
英文刊名:APPLIED MATHEMATICS AND MECHANICS(ENGLISH EDITION) 
年,卷(期):2002 23(1) 
分类号:O347.4 O347.7 O344.7 TU43 
关键词:porous media   wave propagation   visco-elastoplasticity   material stability   dispersivity   hydro-dynamic coupling  
机标关键词:WAVE PROPAGATIONwave propagationnumerical modellinghigh strain ratecoupling effectshock loadingporous mediapore fluidphases of 
基金项目:国家自然科学基金 
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