水泥土搅拌粉喷桩施工中基坑局部冒水原因分析及处理措施  

Cause analysis and treatment measures of local water leakage in foundation pit during construction of cement-soil mixing powder spraying piles

作　　者：何文龙 HE Wenlong(Anhui Survey and Design Institute of Water Resources and Hydropower Co.,Ltd.,Hefei 230088,China)

机构地区：[1]安徽省水利水电勘测设计研究总院有限公司,安徽合肥230088

出　　处：《江淮水利科技》2023年第1期35-38,48,共5页Jianghuai Water Resources Science and Technology

摘　　要：为揭示某泵站水泥土双向搅拌粉喷桩在施工过程中局部地表形成冒水空洞的原因,采用高密度电法和静力触探法对空洞及周边部位进行补充勘测探查,并采取埋设排气管和压密注浆措施进行处理。结果表明:穿堤涵第4-5节地层含砂量较大,局部有粉砂、砂壤土夹层或透镜体夹层,随着喷粉压力在粉砂性土夹层中蓄积、连通,在地表相对薄弱环节集中排泄,形成地面集中冒水点,带走土颗粒,形成冒水空洞。在冒水点附近埋设排气管和压密注浆处理后效果较好。研究成果对类似地层水泥土双向搅拌粉喷桩地基处理具有一定的借鉴意义。In order to reveal the cause of the formation of water pouring cavity on the local surface of a pumping station during the construction of cement-soil two-way mixing powder spray pile,the high-density electric method and static sounding method are used to conduct supplementary exploration of the cavity and its surrounding parts,and the buried exhaust pipe and compaction grouting measures are taken to deal with it.The results show that the strata of section 4-5 through the dike culver contains a large amount of sand,and there are silty sand,sandy loam interlayer or lens interlayer locally.With the accumulation and connection of powder spraying pressure in the silty soil interlayer,the concentrated drainage at the relatively weak link on the surface forms a concentrated surface water point,which carries away soil particles and forms a water cavity.The effect of burying exhaust pipe near the water point and compaction grouting treatment is better.The research results have a certain reference significance for the treatment of cement-soil two-way mixing powder spray pile foundation in similar strata.

关 键 词：水泥土双向搅拌粉喷桩 冒水空洞 高密度电法 静力触探 

分 类 号：TV223[水利工程—水工结构工程]