深覆盖层地基混凝土防渗墙弹性模量优化分析

深覆盖层透水地基上修建混凝土防渗墙因其受力条件复杂，防渗墙的渗控与稳定是处理此类地基的关键难题，为此有必要深入了解防渗墙工作性状影响因素.针对某库区防护工程堤基覆盖层深厚且局部下伏岩溶洞隙问题，采用Goodman单元模拟防渗墙与泥皮接触，综合考虑实际施工进度及蓄水入渗作用，利用有限元数值计算方法研究混凝土弹性模量的差异对防渗墙应力变形的影响.研究表明，刚性防渗墙出现明显的拉应力区，塑性墙能保持较好的应力状态；防渗墙水平位移受弹性模量影响较小，竖向沉降随弹性模量增大有所减小.

英文摘要:

The construction of concrete cutoff wall on deep overburden pervious foundation is a key problem in dealing with this kind of foundation because of its complex stress conditions.Therefore，it is necessary to understand the influencing factors of the working characteristics of the cutoff wall.Aiming at the problem of thick overburden layer and local karst voids in the embankment foundation of a certain project，Goodman element is used to simulate the contact between the cut-off wall and the soil.Considering the actual construction progress and impoundment and infiltration，the influence of the difference of elastic modulus of concrete on the stress and deformation of the cut-off wall is studied by finite element numerical calculation method.The results show that the rigid cut-off wall has obvious tension stress zone，and the plastic wall can maintain a good stress state.The horizontal displacement of the cut-off wall is less affected by the elastic modulus，and the vertical settlement decreases with the increase of the elastic modulus．

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