沥青混凝土面板与土工膜防渗连接结构试验研究

Experimental Study on Anti-seepage Connection Structure of Asphalt Concrete Slab and Geomembrane

针对库岸沥青混凝土面板与库底土工膜的连接型式,提出了取消混凝土连接板,利用钻孔回填弹性环氧砂浆的方式将两种防渗体直接连接的新型结构设计方案,并通过模型试验,研究防渗连接结构锚固区接头部位的力学性能、抗渗性能及锚固参数。结果表明,所提方法锚固区抗拉拔、抗扭性能安全可靠,建议的双道锚固方案可更好地适应0.4 MPa水头下土工膜发生滑移大变形时的防渗要求。根据试验结果提出了优化钻孔参数,具有成孔性好、防渗可靠、对面板整体性影响较小的特点,可为实际工程设计提供参考。

A new anti-seepage structure between the asphalt concrete slab and geomembrane is proposed,which eliminates the concrete connecting plate and adopts backfilling elastomeric epoxy mortar into drilling holes.The mechanical and impervious properties,as well as anchoring parameters of the connecting joints in the anchorage area,are experimentally studied.It is found that the torsional and anti-pulling performance of the proposed anchoring approach is reliable.The suggested double-channel anchoring approach is more compatible with the large deformation of the geomembrane under a pressure of 0.4MPa.According to the results,optimal drilling parameters are proposed,which have the features of good porosity,reliable impermeability and less impact on the asphalt slab,providing a reference for engineering design.