悬挂式防渗墙渗流试验方法与技术改进

Test Method and Improvement of the Research and Experiments about Suspended Cut-off Wall

悬挂式防渗墙的主要作用有限制管涌通道的发展和改变渗流场的流态,目前关于悬挂式防渗墙的试验研究较多,试验方法和技术也在不断改进。该文详细介绍了悬挂式防渗墙模型试验方法和试验过程,并提出了试验技术改进。比如采用压力水袋作为覆盖层的模拟材料,有效阻止覆盖层和砂样接触面出现间隙,防止覆盖层边沿发生漏水;砂槽上游供水设计成"二级供水"模式,使上游水位更稳定;使用透明纱布消除排水液面"张力"对下游排水顺畅性的影响;改进供水箱,消除进水边界水头损失。

Suspended cut-off wall was studied a lot about the development of piping and the change of seepage flow,with the development of the test methods and techniques have been improved. In this paper on the suspended cut-off wall seepage test,the improvement technology of suspended cut-off wall simulation test is introduced. For example,the pressure water simulation layer can effectively prevent the upper sand tank leaking and covering ground gaps; Sand groove upstream water supply design into the secondary water supply mode make the upstream water level more stable; Drainage liquid level ＂ tension＂ transparent gauze is used to eliminate the impact on the downstream drainage flow; Improving the upstream water tank to cut the boundary water head loss.