大西沟水库大坝镶嵌碎裂结构基岩的防渗处理  

Anti⁃Seepage Treatment of Inlaid Fractured Bedrock in Daxigou Reservoir Dam

作　　者：李文新[1] 崔炜[2] LI Wenxin;CUI Wei(Xinjiang Investigation and Design Institute of Water Resources and Hydropower Co.,Ltd.,Urumqi 830000,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]新疆水利水电勘测设计研究院有限公司,新疆乌鲁木齐830000 [2]中国水利水电科学研究院,北京100038

出　　处：《人民黄河》2022年第10期113-116,共4页Yellow River

基　　金：新疆水利科技专项资金项目(XSKJ-2022-05);流域水循环模拟与调控国家重点实验室自主研究课题(HTGE0146B012022SS221)。

摘　　要：大西沟水库大坝基岩呈镶嵌碎裂结构,坝基开挖过程中出现硫化氢异常气体,其对坝基混凝土有腐蚀性。经分析,基岩镶嵌碎裂结构、地下水水温低、浆液渗流速度快、溶有硫化氢和硫酸根离子等因素造成了试验性灌浆质量差。鉴于此,选用混合浆液和硅溶胶浆液作为帷幕灌浆材料,根据沿轴线地质情况差异对帷幕灌浆区进行划分,对各分区采取不同的灌浆材料组合,并采取适宜的施工方法以防止岩体扰动和劈裂。此外,通过增设混凝土截渗槽、新加混凝土盖板、填筑反滤料等措施解决表层基岩渗流问题。水库蓄水运行期的连续渗流监测结果表明,坝基处理措施作用良好,地下水渗流状况正常。The dam bedrock of Daxigou Reservoir has developed inlaid and fractured structures,and abnormal hydrogen sulfide gas appears during the excavation of the dam foundation,which is corrosive to the dam foundation concrete.After analysis,the dam foundation inlaid and fractured structure,the low temperature of the bedrock groundwater,fast seepage velocity,dissolved hydrogen sulfide gas and sulfate ions and other factors caused the poor quality of the experimental grouting.In view of this,mixed grout and silica sol grout were selected as curtain grouting materials.According to the difference of geological conditions along the axis,the curtain grouting area was divided,and different grouting material combinations were adopted for each partition,and appropriate construction methods were adopted to prevent the rock mass disturbance and splitting.In addition,the seepage problem of the surface bedrock was solved by adding concrete seepage troughs,adding concrete cover plates,and filling in anti⁃filter materials.The continuous seepage monitoring results during the storage operation period of the reservoir shows that the dam foundation treatment measures work well and the groundwater seepage is normal.

关 键 词：大坝 镶嵌碎裂结构 基岩 防渗处理 帷幕灌浆 渗流稳定 大西沟水库 

分 类 号：TV223.4[水利工程—水工结构工程]