粉细砂地层防渗帷幕综合施工方法

Comprehensive Construction Method of Anti-seepage Curtain in Silt and Fine Sand Layer

摘要:

四川省武都水库右岸EL574 m灌浆平洞揭露出厚度2.3～9.8 m的粉细砂层，普通水泥高压灌浆无法形成可靠的防渗帷幕。采用高压旋喷、湿磨细水泥、化学灌浆的组合处理方式，取得了较好的施工效果。通过钻孔压水、大功率声波CT、单孔声波、钻孔全景数字成像等方法检测，表明达到了设计防渗要求。

Abstract:

On the right bank of Wudu reservoir of Sichuan, silt and fine sand layer with thickness of 2.3～9.8m exposed in EL574m grouting adit; in this case, reliable anti-seepage curtain can not be formed by high pressure grouting with ordinary cement. By the use of a combined grouting method of high pressure jetting grouting, wet grinding fine cement and chemical grouting, good construction effect is achieved. The construction was tested by water pressure in borehole, high-power acoustic CT, single-hole acoustic wave and drilling digital panoramic imaging, which indicates that the construction has met the requirement of designed seepage control.