堆石坝心墙与防渗墙不同联结方式抗渗性能的试验研究

Experimental Research on Impermeability of Junction Part between Core Wall in Rockfill Dam and Diaphram Wall

为了解堆石坝沥青砼心墙与防渗墙联结接头的抗渗性能，采用平面平行渗流模型，研究了在各种工况下，硬、软接头联结方式的接缝抗渗安全性。结果表明：硬、软两种接头方案均满足抗渗性能要求。硬接头构造简单、施工方便，接缝有效抗渗长度较软接头方案长；软接头能较好适应地基不均匀沉陷，减小心墙和防渗墙结合部的应力集中。又以平面辐向流渗流模型作为校核模型试验，所得试验结果应用复变函数理论将其“化引”为平面平行渗流状态下的结果，以进一步验证硬。

In order to understand the anti seepage properties of connection joint between the bitumen concrete core wall in the rockfill dam and the diaphram wall,the impermeability safety of joints with two different connection patterns,i.e.hard joint and soft joint,under various loading conditions,are investigated by use of plane parallel seepage model tests.The test results indicate that the two connection schemes can satisfy the requirements of design.The configuration of the hard joint is simple,convenint in construction and needs longer effective length of anti seepage than that of soft joint.The soft joint can suit to the nonuniform settlement of foundation and decrease stress concentration at connection part.By complex variable function theory,the results obtained from plane radial flow model which is used as a check model are transformed to the results of plane parapllel seepage,and then the two results are compared with each other.The conclusion verifies the reliability of plane parallel seepage model tests of the two schemes ,i.e.hard and soft joints.