不同水平应力条件下层状软岩隧道开挖变形破坏模型试验研究

doi:10.13722/j.cnki.jrme.2022.0746

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摘要层状软岩的变形破坏特性与产状相关，水平应力对层状软岩隧道围岩稳定性影响显著。基于3D打印技术，通过考虑水平侧压力系数以及岩体变形时效性的变形破坏模型试验，研究不同水平应力条件下隧道围岩的破坏特征，得到层状软岩隧道开挖扰动应变场的分布规律。研究结果表明：当侧压力系数小于1.4时，围岩变形受层面的影响更为显著，围岩压应变沿洞周不均匀分布，围岩破坏模式表现为沿软弱层面的剪切滑移破坏；当侧压力系数大于1.4时，随着水平应力的增加，围岩压应变分布沿垂直于水平应力的方向发生一定偏转，且压应变量值与开挖扰动区范围迅速增加，围岩破坏表现为层面剪切滑移与基岩压剪破坏的组合破坏模式。隧道开挖后，随着时间的增加，围岩压应变范围在变形前期得到快速增长，且沿层面与垂直层面向围岩深部继续扩展。层状软岩隧道开挖后围岩破坏的方位与水平应力和地层产状密切相关，不同水平应力条件下，隧道围岩的破坏方位有着显著的差异，在隧道支护设计时应综合考虑围岩的局部加强与整体稳定性。

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	舒晓云1
	2
	田洪铭1
	陈卫忠1
	郭长宝3
	朱珍德2
	田云4
	李喆5

关键词 ：岩石力学, 层状软岩, 模型试验, 数字散斑技术, 隧道开挖, 水平应力

Abstract：The deformation and failure characteristics of layered soft rocks are related to their occurrence，and the horizontal stress significantly affects the stability of the surrounding rocks of layered soft rock tunnels. In this paper，based on 3D printing technology，the deformation and failure characteristics of tunnel surrounding rocks under different horizontal stress conditions are studied through model tests，in which horizontal lateral pressure coefficient and time-dependent deformation of rock mass were considered. In addition，the distribution law of strain field disturbed by layered soft rock tunnel excavation is obtained. The research results are as follows. When the lateral pressure coefficient is less than 1.4，the effect of layers on surrounding rock deformation is more significant；the compressive strain of the surrounding rock is unevenly distributed along the perimeter of the tunnel；the failure mode of the surrounding rock is shear sliding failure along the soft layer. When the lateral pressure coefficient is greater than 1.4，with the increase of the horizontal stress，the distribution of the compressive strain of the surrounding rock is deflected along the direction perpendicular to the horizontal stress；the compressive strain increases and the excavation disturbed zone expands rapidly；the failure mode is layer shear slip combined with bedrock compression-shear failure. After tunnel excavation，the compressive strain of the surrounding rock rapidly grows over time in the pre-deformation period and continues to expand along the layer and the direction perpendicular to the layer to the deeper part of the surrounding rock. The orientation of surrounding rock failure after layered soft rock tunnel excavation is closely related to the horizontal stress and the stratigraphic occurrence. The orientations vary significantly under different horizontal stress conditions. The local strengthening and overall stabilization of the surrounding rock should be integrated during tunnel timbering design.

Key words： rock mechanics layered soft rock model test digital speckle technology tunnel excavation horizontal stress

引用本文:

舒晓云1，2，田洪铭1，陈卫忠1，郭长宝3，朱珍德2，田云4，李喆5. 不同水平应力条件下层状软岩隧道开挖变形破坏模型试验研究[J]. 岩石力学与工程学报, 2023, 42(S2): 4204-4215.
SHU Xiaoyun1，2，TIAN Hongming1，CHEN Weizhong1，GUO Changbao3，ZHU Zhende2，TIAN Yun4，LI Zhe5. Model tests for deformation and failure characteristics during layered soft rock tunnel excavation under different horizontal stress conditions. , 2023, 42(S2): 4204-4215.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0746 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4204

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