沥青混凝土心墙在水库大坝防渗中的应用

The Application of Asphalt Concrete Core Wall in Seepage Control of Reservoir Dam

针对中叶水库工程大坝工程地质条件及工程区防渗土料缺乏的实际情况,对大坝坝体防渗方案进行比选,工程采用沥青混凝土心墙方案。结合水库工程,从技术特性、防渗布置、施工工艺、填筑方法等方面进行研究。施工结束后,对墙体进行质量检查,沥青混凝土容重2.35~2.43 g/cm^3,孔隙率0.5%~2.8%,渗透系数均小于1×10^-8 cm/s,质量满足要求,高水位时,水库外坝坡无渗漏现象,大坝防渗效果明显。沥青混凝土心墙应用于大坝坝体防渗,解决了防渗土料缺乏地区的筑坝难题。这项技术在中叶水库工程的成功应用,对类似工程具有借鉴作用。

In view of the geological conditions of dam engineering in the Zhongye Reservoir project and the lack of impermeable soil in the engineering area, the seepage control scheme of the dam is compared and selected, the project adopts asphalt concrete core wall scheme. Combined with reservoir engineering, this paper studies the technical characteristics, seepage control arrangement, construction technology and filling method. After the construction, quality inspection is conducted on the wall, the bulk density of asphalt concrete is 2.35~2.43 g/cm^3, the porosity is 0.5%~2.8%, and the permeability coefficient is less than 1×10^-8 cm/s, the quality meets the requirements. When the water level is high, there is no leakage in the dam slope of the reservoir, the dam seepage control effect is obvious. Application of asphalt concrete core wall in the dam seepage control and solve the difficulties in damming the impervious soil is lack of areas. The successful application of this technology in the Zhongye Reservoir Projects can be a reference for similar projects.