不同开挖工法对含煤系岩层隧道围岩稳定性影响

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摘要针对目前道路建设中常见的含煤系岩层隧道开挖问题,以正习高速桃子垭隧道为例,模拟3种施工方法开挖煤系岩层的施工全过程,对围岩稳定性及支护结构进行分析,得到了应力、位移等参数在施工过程中的变化规律并提出施工建议。结果表明,开挖方法与临时结构影响围岩及隧道结构的应力分布与变形:对于台阶法,可适当在下半断面布置临时结构控制变形;而在倾斜岩层的交界面上,CRD(cross diaphragm)法与核心土法应根据工况调整各断面开挖进尺稳定后方围岩,控制开挖时的围岩变形。针对以上结果可优化施工方案与支护设计,对同类特征隧道施工具有借鉴意义。

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	左宇军
	万入祯
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	刘镐
	林健云
	娄义黎

关键词: 煤系岩层施工方法数值模拟支护结构围岩稳定性

Abstract: Aiming at the common problems of tunnel excavation in coal-bearing strata in road construction at present, taking Taoziya Tunnel of Zhengxi Expressway as an example, the whole construction process of three construction methods for coal-bearing strata excavation was simulated. The stability of the surrounding rock and the supporting structure were analyzed, and the variation rules of stress, displacement and other parameters during the construction process were obtained and the construction suggestions were put forward. The results showed that the excavation method and temporary structure affected the stress distribution and deformation of surrounding rock and tunnel structure: for the step method, the temporary structure might be appropriately arranged to control the deformation in the lower half section; at the interface of the inclined rock strata, the CRD method and the core soil method should adjust the surrounding rock of each section to stabilize the rear surrounding rock according to the working conditions, and control the surrounding rock deformation during excavation. According to the above results, the construction scheme and supporting design could be optimized, which has reference significance for similar tunnel construction.

Key words: coal seams construction method numerical simulation supporting structure stability of surrounding rock

收稿日期: 2019-09-03 出版日期: 2019-12-20 发布日期: 2020-03-09 期的出版日期: 2019-12-20

中图分类号:

U458.1

基金资助: 国家自然科学基金资助项目(51964007;51774101;51574093);贵州省高层次创新型人才培养资助项目(黔科合人才(2016)4011号);贵州省矿山动力灾害预警与控制技术科技创新人才团队资助项目(黔科合平台人才〔2019〕5619)

作者简介: 左宇军(1965— ),男,湖南湘潭人,博士,教授,博士生导师,主要研究方向为岩石力学及采矿工程. E-mail:zuo_yujun@163.com

引用本文:

左宇军,万入祯,孙文吉斌,刘镐,林健云,娄义黎. 不同开挖工法对含煤系岩层隧道围岩稳定性影响[J]. 隧道与地下工程灾害防治, 2019, 1(4): 64-74.
ZUO Yujun, WAN Ruzhen, SUN Wenjibin, LIU Hao, LIN Jianyun, LOU Yili. The influence of different excavation methods on the stability of surrounding rock of tunnel in coal-bearing strata. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(4): 64-74.

链接本文:

http://tunnel.sdujournals.com/CN/Y2019/V1/I4/64

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