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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。
The main function of hanging cut-off wall is to limit the development of pipe flow passage and to change the flow field of the seepage field. At present, there are more experimental studies on suspended cut-off wall and the testing methods and techniques are constantly improving. This paper introduces the model test method and test process of suspended cut-off wall in detail, and proposes the improvement of test technique. For example, using pressure water bag as the simulation material of the covering layer can effectively prevent the gap between the covering layer and the sand sample interface to prevent water leakage at the edge of the covering layer. The upstream water supply in the sand tank is designed as a secondary water supply mode, Stability; the use of transparent gauze to eliminate drainage level “tension” on the downstream drainage smoothness; improve the water supply tank to eliminate water head loss.