垃圾填埋场防渗墙变形数值分析

为了研究以聚乙烯醇改性粘土基浆材为主要材料的垃圾填埋场防渗墙在实际应用中的变形规律,以室内实体模型为对比参照,根据实体模型的材料参数,采用有限元分析软件对用聚乙烯醇改性防渗浆材浇筑而成的防渗墙进行建模与分析,并比较了数值模拟结果与试验结果。结果表明,墙体水平位移自墙顶向下逐渐减小,未出现反向位移,水平位移近似于线性变化;墙体主应力小于浆材的极限耐受值,且无拉应力的出现,具有良好的变形协调性;计算值与模拟值变化趋势相近且差异较小,计算结果具有合理性,说明防渗墙的应力应变能够满足垃圾填埋场实际应用的要求。

Numerical Analysis of Deformation of Cutoff Wall in Landfill Site

In order to study the deformation regularity of polyvinyl alcohol modified clay-based slurry in the practical application of landfill site, the finite element analysis software was used to analyze the impervious wall made of polyvinyl alcohol modified anti-seepage slurry. The indoor solid model was used as a contrast reference. Comparing the numerical simulation results with the experimental results, it is concluded that the horizontal displacement of the wall decreases gradually from the top to the bottom, there is no reverse displacement, and the horizontal displacement is approximately linear; The main stress of wall is smaller than that of slurry, and there is no tensile stress. The cut-off wall has good deformation compatibility. The calculated values are similar to the simulated values, and the difference is small. The calculated results are reasonable. It shows that the stress and strain of the cut-off wall can meet the requirements of the practical application of landfill site.