含软弱夹层隧道围岩变形特性与加固参数设计方法

doi:10.13722/j.cnki.jrme.2021.0255

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摘要对太焦铁路五谷山1#隧道进行现场监测，分析含软弱夹层隧道围岩变形特征。将多断面上的围岩及支护结构力学响应结果的平均值和标准差转化为二维平面上与原点的ECULID距离作为评价指标，利用正交试验分析加固参数对围岩及支护结构力学响应的影响，并以模糊决策理论为基础，将各组试验结果与多评价指标的全局最优值之间的ECULID距离作为综合评价指标，提出基于综合评价指标的加固参数设计方法，分别对未注浆和采用最优加固参数组合的1#隧道围岩及支护结构力学响应进行数值模拟研究。结果表明，含软弱夹层隧道拱顶沉降具有持续时间长、沉降速度快、最终沉降值大等特征，注浆加固可以减小70%～80%的拱顶沉降，缩短围岩稳定时间，有效地抑制围岩位移发展。土体黏聚力和剪切强度对含软弱夹层隧道开挖影响最为明显，未注浆时，软弱夹层与隧道断面交点处会产生较大的弯矩和不可忽略的扭矩，且初支拱脚处发生应力集中现象，隧道开挖稳定性难以保证。应用提出的加固参数设计方法对1#隧道进行注浆加固缩小了围岩松动区，减小断面扭矩至可忽略，改善初支应力集中，取得了显著的工程效果。

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	彭鹏
	张顶立
	孙振宇

关键词 ：隧道工程, 注浆, 软弱夹层, 参数设计, 力学响应

Abstract：The Wugushan No.1 tunnel of Taijiao railway was monitored and the deformation characteristics of the surrounding rock of the weak interlayer tunnel were analyzed. Converting the mean values and standard deviations of mechanical response results of the surrounding rock and the support on multisection into the ECULID distance from the origin point on a two-dimension plane as evaluation indexes，the influence of the reinforcement parameters on the mechanical response of the surrounding rock and the support was analyzed by orthogonal experiments. Based on fuzzy decision theory，by using the ECULID distance between the simulated result of each group and the global optimal value of the multiple evaluation index as the comprehensive evaluation index，a reinforcement parameter design method was proposed. The mechanical response of the surrounding rock and the support of No.1 tunnel without grouting and with grouting using the optimal reinforcement parameter combination were respectively studied. The results demonstrate that the crown settlement of the tunnel has the characteristics of long duration，fast settlement and large final settlement. Grouting reinforcement can reduce about 70% to 80% of the crown settlement，shorten the stability time of the surrounding rock and effectively restrain the development of the surrounding rock displacement. Cohesive and shear strength have the most significant influence on the excavation response of the weak interlayer tunnel. In the non-grouting tunnel，a large bending moment and a non-negligible torque are produced at the intersection of the weak interlayer and the excavation section，and the concentrated stress occurs at the arch foot of the initial support，which makes the excavation stability of the tunnel is difficult to be guaranteed. No.1 tunnel was reinforced by grouting utilizing the reinforcement design method proposed in this paper，showing that the surrounding rock loose area is narrowed，the section torque is reduced to be negligible and the stress concentration of the initial support is positively improved.

Key words： tunnelling engineering grouting weak interlayer parameter design mechanical response

引用本文:

彭鹏，张顶立，孙振宇. 含软弱夹层隧道围岩变形特性与加固参数设计方法[J]. 岩石力学与工程学报, 2021, 40(11): 2260-2272.
PENG Peng，ZHANG Dingli，SUN Zhenyu. Deformation characteristics of surrounding rock and reinforcement parameter design of weak interlayer tunnels. , 2021, 40(11): 2260-2272.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0255 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I11/2260

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