下坂地水利枢纽工程坝基防渗工程设计与施工

由于下坂地水利枢纽工程设计坝基垂直防渗无论是其覆盖层深度、地层复杂性，还是其防渗墙深度、帷幕灌浆深度、“上墙下幕”设计形式在国内均无实践先例，设计、施工难度均非常大，尤其是75～156 m超深砂砾石层帷幕灌浆国内也还尚未出台有关的施工规范。因此本工程在地质条件极其复杂的深厚覆盖层条件下超深防渗墙和帷幕灌浆试验研究与实施，具有特殊的代表性。其质量检查和评定方法则成为了研究重点。经过有关专家咨询研究，最终确定了砂砾石帷幕灌浆的质量检查方法。该方法对类似工程的质量检查与评定具有重要的参考价值。

Design and construction of foundation anti-seepage for dam of Xiabandi Water Control Project

As not only the depth of the overburden and the stratum complicacy， but also the depths of cut-off wall and curtain grouting and the design pattern of the“cut-off wall upon curtain grouting” for the design of the vertical foundation anti-seepage for the dam of Xiabandi Water Control Project are no any practice cases there in China at all， there are great difficulties in the design and construction of it， especially， there is still no any related specifications published in China for the construction of the curtain grouting of sand-gravel stratum with the super-depth of 75~156 m.Therefore， the experimental study with its implementation on the construction of the over-deep cut-off wall and the curtain grouting under a most complicated geological condition of deep overburden has a special typicality； of which the methods for the quality inspection and assessment become the study focuses concerned.Through the consultations and studies from the relevant experts， the quality inspection method for the curtain grouting of sand-gravel stratum is finally made， which can provide an important reference for the quality inspection and assessment of the similar projects.