混凝土防渗墙模型试验与有限元模拟结果对比

Physical Modeling and Finite Element Simulation

通过室内防渗墙模型槽试验,以及采用三维有限元法对模型试验的模拟,对模型试验结果和模拟计算结果进行了对比,从而分析防渗墙的应力变形,验证现有有限元计算方法的合理性。结果表明:随着模型表面压力的增大,防渗墙内应力逐渐增大,而且上部增大速率明显比下部大;廊道对防渗墙顶的应力有显著增大效应,在廊道与防渗墙接触处应力最大,应力随着防渗墙埋深方向呈减小趋势,呈板桩受力特点;有限元计算的防渗墙应力与试验实测应力在整体趋势上相近,在数值上差异较大;目前常用的有限元计算模拟方法有一定合理性。

Using physical model tests and 3 - D finite element method to study on the diaphragm wall. To analyze the stress and deformation of the diaphragm wall and validate the reliability of finite element method, the results of finite element method were compared with model tests. The re- suits show that： internal stress of diaphragm wall increases with the stress on the model surface increases, the stress growth rate of wall ＇ s upper part increases apparently ; corridor caused an obvious accretion affeet on the top wall＇ s stress, the contact between corridor and diaphragm wall is the biggest, the stress decreases with buried depth, as the characteristics of the sheet-pile＇ s force; the calculation of finite element is similar to the ob- served stress on the overall trend, however, making a difference on the numerical; the present common method finite element method has a certain rationality.