浅埋偏压坡积土与泥石流堆积混合带进洞施工技术

于京波; 李志军; 王秋林; 任瑞乐; 刘广志; 李武涛; 吕政; 孙魏

doi:10.3973/j.issn.2096-4498.2022.S2.053

隧道建设 >

2022 , Vol. 42 >Issue S2: 428 - 434

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.S2.053

施工技术

浅埋偏压坡积土与泥石流堆积混合带进洞施工技术

于京波 ,
李志军 ,
王秋林 ,
任瑞乐 ,
刘广志 ,
李武涛 ,
吕政 ,
孙魏

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（1. 中铁隧道局集团有限公司，广东广州 511458； 2. 西南交通大学，四川成都 610000； 3. 中铁隧道集团二处有限公司，河北三河 065201； 4. 北京工业大学，北京 100124）

于京波（1984—），男，河南南阳人，2006年毕业于华北水利水电学院，交通工程专业，本科，高级工程师，现从事隧道工程施工技术工作。Email： 252074706@qq.com。

网络出版日期: 2023-03-25

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Tunnel Entering Construction Technology in Slope Wash Soil and Mudslide Accumulation Mix Zone with Shallow Overburden and Asymmetrical Pressure

YU Jingbo ,
LI Zhijun ,
WANG Qiulin ,
REN Ruile ,
LIU Guangzhi ,
LI Wutao ,
LYU Zheng ,
SUN Wei

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(1.China Railway Tunnel Group Co.,Ltd.,Guangzhou 511458,Guangdong,China;2.Southwest Jiaotong University,Chengdu 610000, Sichuan,China;3.Then Second Engineering Co.,Ltd. of China Railway Tunnel Group,Sanhe 065201,Hebei,China;4.Beijing University of Technology,Beijing 100124,China)

Online published: 2023-03-25

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摘要

为解决进口浅埋偏压坡积土与泥石流堆积混合带Ⅵ级围岩易坍塌、易滑坡、进洞难问题，对高原铁路某隧道施工难题及快速进洞施工关键技术进行研究。主要研究与结论如下： 1）采用超前大管棚，提高洞口30 m浅埋段围岩土体强度； 2）洞口施作11根端头桩、右侧边坡施作34根抗滑桩增加边坡稳定性，解决偏压问题； 3）洞顶90 m范围设置1 054根旋喷桩，提高洞身坡积土稳定性；采用198 m渡槽，将洞顶右侧冲沟水横跨洞身引出、并创新性利用地势，在挡墙顶部修渡槽的方式，消除雨季泥石流隐患； 4）进洞30 m堆积体Ⅵ级围岩段，采用超前小导管加固、悬臂掘进机非爆开挖方式，减少对围岩的扰动，并根据冬期施工要求，优化施工顺序，将“先明后暗”改为“先暗后明”。实践证明：采用“大管棚+抗滑桩+旋喷桩+渡槽+悬臂掘进机开挖”的方法，能减小进洞施工对隧道工程周边环境的影响，可有效地加快施工进度，确保安全进洞。

关键词： 高原铁路; 浅埋偏压; 预加固; 悬臂掘进机; 安全进洞

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于京波 , 李志军 , 王秋林 , 任瑞乐 , 刘广志 , 李武涛 , 吕政 , 孙魏 . 浅埋偏压坡积土与泥石流堆积混合带进洞施工技术[J]. 隧道建设, 2022 , 42(S2) : 428 -434 . DOI: 10.3973/j.issn.2096-4498.2022.S2.053

Abstract

The grade Ⅵ surrounding rock at mix zone of slope wash soil and mudslide accumulation with shallow overburden and asymmetrical pressure at tunnel entrance is prone to collapse and landslide, resulting in difficult tunnel entering. As a result, the construction difficulties and rapid tunnel essential entering technologies of a plateau railway are studied. Main studies and conclusions are as follows: (1) The advance large pipe roof is employed to improve the surrounding rock strength at 30 m section of tunnel entrance. (2) 11 end piles and 34 t friction piles are arranged at tunnel entrance and sideslope respectively to solve asymmetrical pressure problem. (3) 1 054 jet grouting piles are arranged within 90 m zone on tunnel top to improve the stability of slope wash soil; a 198 mlong aqueduct is adopted to drain the water on tunnel top right, and the aqueduct is arranged at top of retaining wall innovatively to reduce the mudslide risk in rainy season. (4) The advance smallduct reinforcement and cantilever boring machine are adopted at grade Ⅵ surrounding rock at 30 m mix zone of tunnel entrance to minimize disturbance to surrounding rock; the construction sequence is improve from opencut first and then mining to mining first and then opencut according to construction requirements in winters. The application results show that the methods recommended can minimize the influence of tunnel entering construction on surrounding environment, shorten the construction period, and guarantee the construction safety.

Key words： plateau railway; shallow overburden and asymmetrical pressure; preconsolidation; cantilever boring machine; safe tunnel entering

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