某高速铁路跨塘路基防渗加固措施研究

摘要:某高速铁路D4K485+845～D4K486+045段路基跨越堰塘尾部，受到堰塘蓄水、放水影响，不能保证运营安全，经补充勘察和现场调查，采取左侧塘堰地下防渗处理、双排高压旋喷咬合桩止水帷幕，堰塘靠路基侧设置混凝土挡水堤坝，库尾段堤坝基础采用钻孔桩+桩基托梁；路基左侧坡脚设置双排高压旋喷咬合桩止水帷幕，路堑边坡每隔8 m设一道支撑渗沟，路基两侧侧沟下设置盲沟，路基基底采用CFG桩加固，CFG桩顶部设置碎石垫层夹双向土工格栅，再加设一层复合防排水板的综合处理措施，获得良好效果。

Study on Seepage Prevention and Reinforcement Measures of a Subgrade Crossing Weir Pond of a High Speed Railway

The subgrade of a high-speed railway section D4K485+845 ~ D4K486+045 crosses the tail of the weir pond, which is affected by the water storage and release of the weir pond, so the safety of high-speed railway operation cannot be guaranteed. Through supplementary investigation, underground anti-seepage treatment, high pressure rotary jet secant pile water-stop curtain are used. Concrete water retaining dam, dam foundation at the tail of the reservoir uses bored pile + pile foundation joist; the cutting slope is provided with support seepage ditch, and the subgrade side ditch is provided with blind ditch. The foundation of the subgrade is reinforced by CFG pile, the gravel cushion sandwiched with bidirectional geogrid was set, and a layer of composite waterproof and drainage plate is added to achieve good results.