沥青混凝土面板与土工膜防渗连接方式研究——以江苏句容抽水蓄能电站为例

Research on connection joint between asphalt concrete slab and geomembrane:case of Jurong Pumped Storage Power Station in Jiangsu Province

江苏句容抽水蓄能电站上水库采用库周沥青混凝土+库底土工膜相结合的防渗措施,这两种防渗措施在抽蓄电站中尚属首次结合运用,其中土工膜和沥青混凝土之间连接接头的设计及施工难度较高,尚无成果经验借鉴。为此,采用三维有限元计算和模型试验相结合的方法,研究了适应高坝以及回填库盆大变形条件的库周沥青混凝土面板+库底土工膜的3种接头连接型式。研究结果表明:在沥青混凝土面板底部设置与土工膜的混凝土连接板的方案较优;同时,针对土工膜与沥青混凝土面板直接锚固的方案,若能验证锚固用环境砂浆与沥青混凝土的长期运行可靠性,仍不失为一种创新性方案。

The upper reservoir of Jurong Pumped Storage Power Station adopts the anti-seepage measures of asphalt concrete slab around the reservoir and geomembrane at reservoir bottom.It is the first time that a pumped storage power station uses these two measures comprehensively.The design and construction of connecting joints between the two parts are difficult with no reference.Three types of joint connections between asphalt concrete face slab and geomembrane are studied by combining three-dimensional finite element calculation and model test.The result shows that the scheme of setting concrete connection plate at the bottom of asphalt concrete face slab is recommended.While another scheme of direct anchoring geomembrane and asphalt face slab would be an innovative scheme if long term running stability of anchoring paste and asphalt concrete can be testified.