【摘要】 考虑筑坝砂砾料的压力相关性,对广义塑性模型的弹性模量、加载塑性模量和卸载塑性模量进行了修改,并根据筑坝砂砾料静、动力试验确定了修改后的模型参数。采用修改后的广义塑性模型,进行了200m级砂砾石面板坝的有限元静、动力反应分析。计算结果表明:采用修改的广义塑性模型,可以直接得到坝体在地震荷载作用下发生的永久变形;弹塑性分析得到的大坝静力变形、动力反应和地震永久变形规律合理;合理考虑压力相关的广义塑性模型用于高面板坝静、动力有限元分析是可行的。更多还原

【Abstract】 Elastic modulus,load and unload plastic modulus of generalized plastic P-Z model were improved by considering pressure dependency of dam-filling gravel materials,and experimental data of static and dynamic triaxial tests of the gravels were used to calibrate the improved model’s parameters.By using this model,a static and dynamic finite element method(FEM) was adopted to analyze a gravel concrete-faced rockfill dam(CFRD) of 200m-grade high.The results show that permanent dam deformation under earthquakes can be directly obtained with the improved generalized plastic model,and that the behaviors of static deformation,dynamic responses and permanent deformation obtained through elastic-plastic analysis are reasonable.Thus consideration of pressure dependency by the improved model is feasible and effective.更多还原