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针对目前有限元计算所得的混凝土防渗墙应力常与工程实测结果出入较大问题,以狮子坪水电站土石坝为例,利用平面有限元法分析应力变形,采用敏感性分析方法研究了土体邓肯-张E-ν模型参数对防渗墙应力影响的敏感性,并分析了覆盖层、高塑性土、残渣单元及接触面Goodman单元四种材料16个参数对防渗墙应力的影响。结果表明,覆盖层地基的参数对防渗墙的应力影响较大,接触面参数的影响不容忽视,其他因素均对防渗墙应力整体影响较小。
In view of the fact that the stress of concrete impervious wall often found by finite element method is far from the actual measured result, taking the earth-rock dam of Shiziping Hydropower Station as an example, the stress and deformation are analyzed by plane finite element method, and the sensitivity of the soil Duncan - E - ν model parameters on the impact of impervious wall stress sensitivity and analysis of the cover layer, high plasticity of soil, residue unit and the interface Goodman unit of four parameters of 16 parameters on the impermeable wall stress. The results show that the parameters of the overburden foundation have a great influence on the stress of the seepage prevention wall. The influence of the parameters of the contact surface can not be neglected. All other factors have little effect on the overall stress of the seepage prevention wall.