大孔径螺旋钻钻孔高喷防渗墙施工方法研究  

Construction method of high-pressure jet grouting cut-off wall with large-bore helical drill

作　　者：刘达 谢为江 胡松涛 姚池[3] LIU Da;XIE Weijiang;HU Songtao;YAO Chi(Jiangxi Provincial Institute of Water Science,Nanchang 330029,China;Jiangxi Provincial Research Center on Hydraulic Structures,Nanchang 330029,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330029,China)

机构地区：[1]江西省水利科学院,江西南昌330029 [2]江西省水工安全技术研究中心,江西南昌330029 [3]南昌大学工程建设学院,江西南昌330031

出　　处：《人民长江》2023年第5期189-195,共7页Yangtze River

基　　金：国家自然科学基金项目(51779193);江西省自然科学基金项目(20212BAB214044;20203BBGL73234);江西省水利厅科技项目(201820ZDKT03)。

摘　　要：传统的高喷防渗墙施工工艺受限于早期的钻孔设备,其钻孔孔径大多较小,存在钻孔切割地层、喷浆提升效率不高等问题。通过设备改进,采用大孔径螺旋钻机械辅助高喷防渗墙钻孔,并在钻具嵌入高压流体喷射装置(管路和喷嘴),可实现钻喷一体施工。依托江西省万安县遂川江罗塘乡防洪工程,开展大孔径螺旋钻孔高喷防渗墙施工试验,并采用数值计算分析、室内试验及现场检测相结合的方法验证防渗墙成墙效果。结果表明:在相同的地层参数、孔距、孔深以及喷浆压力条件下,采用更大的钻孔直径和长螺旋钻钻孔可获得更好的破岩效率与地层适应性;从墙体开挖检测、钻孔取芯渗透试验以及高密度电法探测试验结果来看,采用大孔径螺旋钻钻孔高喷防渗墙施工方法可以获得良好的墙体质量。The borehole diameter of traditional high-pressure jet grouting technique for cut-off wall construction is mostly small due to the equipment limitation.It is difficult to drill in pebble and boulder formations and the drilling,cutting and shotcrete lifting efficiency is low.By improving traditional high-pressure jet drilling equipment,large-bore helical drill was used to assist the drilling of the high-pressure jet grouting cut-off wall,and the high-pressure fluid jet device(pipeline and nozzle)was embedded in the drilling tool,which realized the integrated construction of drilling and jetting.Based on the Luotang Town flood control project in Wan′an County,Jiangxi Province,the cut-off wall construction test with large-bore helical drilling high-pressure jet grouting was carried out,and the wall-forming effect was verified by combining numerical calculation analysis,indoor test and field test.The results showed that under the same formation parameters,hole spacing,hole depth and grouting pressure,larger boreholes and helical drill could obtain better rock breaking efficiency and stratum adaptability compared with the traditional small-bore high-pressure jet.The results of the wall excavation test,core penetration test and high-density electrical detection test show that good wall forming quality can be obtained by using large-bore helical drill high-pressure jet grouting technique.

关 键 词：防渗墙 螺旋钻 高喷法 大孔径 钻喷一体化 

分 类 号：TV641.3[水利工程—水利水电工程]