挤压陡倾千枚岩地层小净距隧道大变形研究

doi:10.13722/j.cnki.jrme.2018.0998

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摘要为了探明小净距隧道穿越挤压性软岩地层的大变形机制，提出相应的大变形控制技术，本文采用理论分析、数值计算、现场试验等手段对这种隧道大变形的影响因素、围岩变形规律、支护受力特征等进行研究，得出主要结论如下：(1) 高构造应力、陡倾围岩产状、低围岩强度、近接施工扰动等多因素的耦合作用，导致了该隧道大变形的发生；(2) 后行隧道对先行隧道的卸荷扰动，一方面使先行隧道承受偏压荷载，另一方面使先行隧道中岩柱侧围岩向洞外产生弯曲破坏，主要表现在先行隧道中岩柱侧边墙位移的减小、初期支护拱部受力状态的转变、二次衬砌拱部和仰拱拉应力的增大；(3) 根据围岩变形和支护受力情况，按近接施工影响程度对小净距隧道进行分区，并以此作为控制措施动态调整和工程类比的依据；(4) 严格控制施工工序，避免先行隧道二次衬砌端头处于后行隧道开挖作业面之内，并根据应力分布特征调整隧道断面形状，根据岩体产状特征调整锚杆角度，根据近接扰动情况对中岩柱进行保护与加固。

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	李磊1
	谭忠盛2
	郭小龙2
	喻渝3
	罗宁宁4

关键词 ：隧道工程, 高地应力, 陡倾岩层, 绿泥石千枚岩, 小净距隧道, 大变形, 控制技术

Abstract：In order to find out the large deformation mechanism of tunnels with small intervals through squeezing soft rock stratum and to propose the control technology of large deformation of surrounding rocks，the influencing factors，the deformation law of the surrounding rock and the mechanical characteristics of the lining structure were studied by theoretical analysis，numerical calculation and field test. Results show that the large deformation of the tunnel is resulted from the coupling effect of multiple factors such as high geostress，steeply dipping strata，low surrounding rock strength and approaching construction. The unloading disturbances of the rear tunnel exerts a bias load to the preceding tunnel on one hand，and on the other hand，results in the bending damage of the surrounding rock of the preceding tunnel near the central rock pillar suffers outwards the tunnel，including the decrease of the displacement of the preceding tunnel's side wall near the central rock pillar，the transformation of the force state of the initial support in the arch and the increase of the tensile stress of the secondary lining in the arch and the inverted arch. According to the surrounding rock?s deformation and the support force condition，the small interval tunnel is divided by the influence degree of proximity construction，which can be used as the basis for the dynamic adjustment of the control measures and the engineering analogy. The construction process should be controlled strictly to avoid the secondary lining?s end of the preceding tunnel lying behind the excavation working face of the rear tunnel，and other measures such as adjusting the shape of the tunnel section according to the stress distribution characteristics，changing the bolt angle according to the characteristics of the rock mass and protecting the central rock pillar according to the proximity disturbance condition should also be taken into account.

Key words： tunnelling engineering high geostress steeply dipping strata chlorite phyllite tunnels with small intervals large deformation control technology

引用本文:

李磊1，谭忠盛2，郭小龙2，喻渝3，罗宁宁4. 挤压陡倾千枚岩地层小净距隧道大变形研究[J]. 岩石力学与工程学报, 2019, 38(2): 276-286.
LI Lei1，TAN Zhongsheng2，GUO Xiaolong2，YU Yu3，LUO Ningning4. Research on large deformation of tunnels with small intervals in squeezing steeply dipping phyllite strata. , 2019, 38(2): 276-286.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0998 或 http://www.rockmech.org/CN/Y2019/V38/I2/276

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