泥石流堆积体隧道围岩加固及施工方案优化研究

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摘要研究目的:兰渝铁路仓园隧道穿越结构松散、含水率高的泥石流体，隧道最小埋深14 m，基底稳定性差、地基承载力低，施工难度及风险很大。采用三维数值模拟，确定穿越泥石流堆积体隧道围岩加固范围、合理施工方法及台阶参数，为本工程施工提供科学依据与技术指导，并为类似工程设计和施工提供参考。

研究结论:(1)采用地表帷幕注浆、大管棚超前支护及洞内掌子而加固相结合，对控制泥石流堆积区隧道施工大变形及改善结构受力效果最佳，特别是加固好掌子而地层，对隧道周边位移控制效果非常明显。 (2)为了保证施工安全及工期，采用地表地层和掌子而注浆注浆加固、大拱脚及隧道基底树根桩加固等施工辅助措施后，通过多施工方法比选，最终选择采用三台阶七步开挖法。(3)三台阶合理的台阶参数为:台阶长度取4m左右较合适，不宜超过6m;上、中、下各阶台阶高度取3. 5 m;错台长度确定为2～3 m;台阶开挖进尺不宜大于0. 6～1.2 m. (4)研究成果可用于穿越泥石流堆积体地层及类似的松散地层的各类隧道工程。

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关键词 ：泥石流, 隧道, 加固, 施工方案, 三维数值模拟

Abstract：Research purposes: Lanzhou-Chongqing railway Cangyuan tunnel through the debris flow that are loose structure and moisture content , tunnel’s minimum depth is 14 m，its basal stability is poor , and has low bearing capacity of foundation，so the tunnel construct is very difficult and risky. The range of surrounding rock reinforcement of the debris flow tunnel , reasonable construction method and step parameters are identified by the three-dimensional numerical simulation. It provide a scientific basis for the construction and technical guidance，and it is available for the reference design and construction of similar projects.

Research conclusions:(1)A combination of surface grouting curtain grouting ,pipe shed advanced support and inside tunnel face reinforcement can make the control of large deformation zones tunnel construction on debris flow deposits and the force of structure best. Especially the tunnel surrounding displacement control effect is very obvious by reinforced tunnel face strata. (2) In order to ensure the safety and construction period the surface strata and tunnel face grouting large basement arch and tunnel reinforcement root piles supporting measures are used as construction auxiliary measures. Through a variety of construction methods comparison，three-steps-seven-footwork tunneling method is chosen as the final method. (3) The reasonable steps parameters of three-steps-seven-footwork tunneling method are as follows:the appropriate length of the step is about 4 m，not more than 6m each step's height is 3 .5 m, the length of dislocation is 2～3m; bench excavation footage is not more than 0.6～1.2m.(4) Research results can be used to cross the debris flow body formation and similar types of loose strata tunnel project.

Key words： debris flow tunnel reinforcement construction program dimensional numerical simulation

收稿日期: 2013-07-08

PACS:

U455

作者简介: 朱正国，1977年出生，男，副教授。

引用本文:

朱正国，朱永全，吴广明，王锦涛，王道远,，李新志,. 泥石流堆积体隧道围岩加固及施工方案优化研究[J]. 铁道工程学报, 2013, 30(11): 75-81.
ZHU Zheng-guo，ZHU Yong-quan，WU Guang-ming, WANG Jin-tao,WANG Dao-yuan，LI Xin-zhi. Optimization Study on Pile of Debris Flow Tunnel Surrounding Rock Reinforcement and Construction Program. Journal of Railway Engineering Society, 2013, 30(11): 75-81.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2013/V30/I11/75

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