摘要
破碎松散的软弱围岩地段,地表沉降及水平收敛值难以控制,台阶开挖难度大、是施工作业的难点.兰渝铁路哈达铺隧道出口端穿越铁匠沟底浅埋段,地质条件复杂.通过对施工过程中逐段揭示的地层地质研究,对比分析了洞内水平旋喷桩、超前管棚+帷幕注浆、地表旋喷桩等施工工艺的实际效果及适用性,最终选择地表竖直旋喷桩方案并伴以掌子面超前加固及封闭,实现了对软塑淤泥质Ⅵ级围岩浅埋隧道的初期支护变形及地表沉降的有效控制.
Crushing loose soft surrounding rock section,the ground settlement and level conver-gence value difficult to control,bench excavation difficult,is the difficulty of construction work. Lan yu railway Hadapu Tunnel exit is cross blacksmith ditch bottom shallow-buried section,geo-logical conditions complex.Through strata of geological studies revealed piecewise process of con-struction,comparative analysis the actual results and applicability of the horouchi horizontal rota-ry j et grouting piles,advanced tune shed,curtain grouting,surface chemical churning pile and oth-er programs.Finally,use surface vertical chemical churning pile scheme,accompanied by tunnel face advance strengthening and closed,to achieve effective control of soft plastic mucky Ⅵ grade shallow buried adjoining rock tunnel initial support deformation and surface settlement.
出处
《兰州交通大学学报》
CAS
2014年第1期5-9,共5页
Journal of Lanzhou Jiaotong University
关键词
软塑状围岩
浅埋隧道
竖直旋喷桩
soft plastic adjoining rock
shallow tunnel
vertical chemical churning pile
