红崖山水库加高扩建工程地基液化处理设计

Designing of foundation liquefaction process for heightening and expansion of Hongyashan Reservoir

红崖山水库位于甘肃省武威市民勤县境内石羊河,腾格里与巴丹吉林两大沙漠交汇边缘,已运行半个多世纪,属于典型沙漠平原水库,由东西大坝及泄洪输水建筑物构成。水库加高扩建设计总库容1.48亿m3,大坝总长7.29 km,大坝坝基及泄洪闸闸基为深厚中细砂地震液化敏感层,存在液化危险,经过综合考虑,分别采用压(盖)重及高压旋喷桩连续墙体"网格围封法"方式处理。处理后的大坝和泄洪闸安全性能得到了提高。

Hongyashan Reservoir is located at the Shiyang River Basin,in Minqin County of Gansu Province.It is a typical desert-plain reservoir placed at the joint of two deserts of Tengger and Badain Jaran.The reservoir has operated for more than a half century,with structures of dam,flood discharge and water conveyance.The designed total capacity of the reservoir is 148 million m3 after heightening of the dam and the total length of the dam is 7.29 km.Since the foundations of dams and sluices are deep fine sand that belong to earthquake liquefaction sensitive layer,pressure(cover)and high pressure jet grouting pile wall with mesh enclosure method are adopted.The safety performance of dams and sluices has been greatly enhanced after the treatment.