细砂层隧道水平旋喷桩超前预加固施工技术
|
摘要
以蒙华铁路王家湾隧道细砂层水平旋喷加固及支护施工为背景,对水平旋喷桩作用原理、适用范围、旋喷方案设计、施工流程、质量保证措施进行研究及应用。研究表明,通过高压水平旋喷形成一定直径的旋喷桩体并相互咬合,在开挖面上方形成整体性较好的旋喷拱,有效避免了开挖过程掌子面出现流砂、塌方及工作面失稳的现象,实现了王家湾隧道顺利贯通,表明水平旋喷桩预支护在风积砂及黄土地层中可行、可靠。
The mechanisms of consolidation by horizontal jet grouting,the selection of the jet grouting parameters,the matching of the horizontal jet grouting equipment and the key technologies of horizontal jet grouting are studied on basis of the horizontal jet grouting used in the construction of Mengxi to Central China Railway Wangjiawan Tunnel in the fine sand strata. The research shows,a spin cylinder and link up each other in the excavation surface is formed by horizontal jet grouting to form a better overall rotation of the jet arch,effectively avoiding the quicksand at the tunnel crown,tunnel collapse and tunnel face instability. The transfixion of Wangjiawan Tunnel shows that the horizontal jet grouting pile is feasible and reliable in consolidation fine sand and loess strata.
The mechanisms of consolidation by horizontal jet grouting,the selection of the jet grouting parameters,the matching of the horizontal jet grouting equipment and the key technologies of horizontal jet grouting are studied on basis of the horizontal jet grouting used in the construction of Mengxi to Central China Railway Wangjiawan Tunnel in the fine sand strata. The research shows,a spin cylinder and link up each other in the excavation surface is formed by horizontal jet grouting to form a better overall rotation of the jet arch,effectively avoiding the quicksand at the tunnel crown,tunnel collapse and tunnel face instability. The transfixion of Wangjiawan Tunnel shows that the horizontal jet grouting pile is feasible and reliable in consolidation fine sand and loess strata.
引文
[1]张红军.上覆富水砂层隧道开挖面稳定性分析与注浆加固对策研究[D].济南:山东大学,2017.
[2]尹成虎.大跨度变断面小净距地铁交叉渡线浅埋粉细砂层隧道暗挖施工关键技术[D].石家庄:石家庄铁道大学,2017.
[3]关宝树.软弱围岩隧道变形及其控制技术[J].隧道建设,2011,31(1):1-17.
[4]张金福.水平旋喷桩在江门隧道浅埋软弱富水围岩加固中的应用研究[D].成都:西南交通大学,2012.
[5]张军.水平旋喷超前预支护加固技术在隧道富水粉细砂层施工中的应用[D].兰州:兰州交通大学,2015.
[6]孙星亮,刘勇,王朝建.国内外水平旋喷注浆加固技术的应用发展[J].探矿工程(岩土钻掘工程),2001(1):8-11.
[7]雷小朋.水平旋喷桩预支护作用机理及效果的研究[D].西安:西安科技大学,2009.
[8]韩莉.水平旋喷搅拌桩在含水砂层超浅埋地铁隧道中的应用[J].广东土木与建筑,2004(8):6-7.
[2]尹成虎.大跨度变断面小净距地铁交叉渡线浅埋粉细砂层隧道暗挖施工关键技术[D].石家庄:石家庄铁道大学,2017.
[3]关宝树.软弱围岩隧道变形及其控制技术[J].隧道建设,2011,31(1):1-17.
[4]张金福.水平旋喷桩在江门隧道浅埋软弱富水围岩加固中的应用研究[D].成都:西南交通大学,2012.
[5]张军.水平旋喷超前预支护加固技术在隧道富水粉细砂层施工中的应用[D].兰州:兰州交通大学,2015.
[6]孙星亮,刘勇,王朝建.国内外水平旋喷注浆加固技术的应用发展[J].探矿工程(岩土钻掘工程),2001(1):8-11.
[7]雷小朋.水平旋喷桩预支护作用机理及效果的研究[D].西安:西安科技大学,2009.
[8]韩莉.水平旋喷搅拌桩在含水砂层超浅埋地铁隧道中的应用[J].广东土木与建筑,2004(8):6-7.