摘要
江坪河水电站下游泄流消能防冲设施采用护岸不护底的防护形式,桩板联合防冲结构体系,作业部位覆盖层深厚,渗水量大,必须进行防渗处理,才能满足挖孔施工条件。通过对防渗墙、固结灌浆、高压旋喷灌浆3种方案的对比分析,确定下游泄流消能防冲设施防渗方式为"上部覆盖层高压旋喷灌浆+下部基岩帷幕灌浆"相结合的方式,解决了深厚覆盖层的防渗和开挖塌坍的问题。采用"上部宽竖井+下部圆形桩"相结合的桩板联合施工技术,增强了桩板结构的整体性及抗冲能力,减少了施工工序,提高了施工效率。
The anti-flushing facility in the downstream of discharge and energy dissipation structure of Jiangpinghe Hydropower Station adopts the protection form of river bank protection without bottom protection, and the pile-plate combination system is used as the anti-flushing facility. As the pile-plate combination system founds on deep overburden, the anti-seepage treatment must be advanced for drilling and excavation. Based on the comparison and analysis of three anti-seepage schemes of antiseepage wall, consolidation grouting and high-pressure rotary jet grouting, the anti-seepage scheme is determined as " High-pressure rotary jet grouting in overburden + Curtain grouting in bedrock", which solves the problems of anti-seepage and excavation collapse in deep overburden. The construction technology of anti-flushing pile-plate combination is also determined as "Upper wide shaft + Lower round pile", which not only enhances the integrity and impact resistance of pile-plate structure,but also reduces the construction process and improves the construction efficiency.
作者
杨大明
张玉平
刘瑜
吴冬明
李先付
YANG Daming;ZHANG Yuping;LIU Yu;WU Dongming;LI Xianfu(China Gezhouba Group Municipal Engineering Co.,Ltd.,Yichang 443002,Hubei,China;Hubei Energy Group Lishui Hydropower Co.,Ltd.,Enshi 445801,Hubei,China)
出处
《水力发电》
北大核心
2020年第6期86-92,共7页
Water Power
关键词
深厚覆盖层
防渗方式
桩板联合
帷幕灌浆
江坪河水电站
deep overburden
anti-seepage mode
pile-plate combination
curtain grouting
Jiangpinghe Hydropower Station
