基于张量距离的深埋隧洞围岩应力扰动指标及特征分析

doi:10.13722/j.cnki.jrme.2021.0695

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摘要针对目前深埋隧洞开挖过程中应力扰动程度难以表征，尤其是主应力方向改变难以量化的问题，基于应力张量间距离建立应力扰动度指标(SDI)，可以定量描述主应力大小和方向的改变。依托加拿大Mine-by深部地下实验室工程和锦屏地下实验室二期(CJPL–II)工程，研究隧洞分步开挖时主应力及其应力扰动度指标的变化特征。结果表明，隧洞开挖过程中，轴向不同位置处应力受扰动度与掌子面位置有关，具有明显的空间分布特征，应力仅在掌子面影响区域内受扰动剧烈。沿隧洞径向方向应力扰动度从洞壁到围岩深部逐渐降低，当掌子面开挖接近监测断面时，应力扰动深度逐渐增大，随着掌子面远离，扰动深度逐渐减小。洞壁处SDI最大，但主应力方向扰动度则不一定最大，峰值位置随掌子面位置变化。扰动度指标物理意义明确，合理地描述隧洞开挖时主应力大小和方向的改变，并且主应力大小和方向的扰动度指标量纲一致，可方便地进行比较。该研究可以为深部地下工程中的围岩稳定性分析和支护设计提供量化的应力扰动评价指标。

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	郑民总1
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	李邵军1
	冯泽杰1
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	曾志3
	薛涛3

关键词 ：岩石力学, 深埋隧洞, 围岩应力, 应力扰动指标, 主应力方向, 张量距离

Abstract：It is difficult to characterize the degree of stress disturbance during underground tunnel excavation，especially to quantify the change of principal stress direction. Based on the distance between the stress tensors，the index of stress disturbed degree(SDI) is proposed，which can quantitatively describe the change of the magnitude and direction of the principal stress. Taking Mine-by Laboratory in Canada as an example，the variation characteristics of principal stress and stress disturbed degree during step-by-step tunnel excavation were studied by numerical simulation. The results show that during tunnel excavation，the degree of stress disturbance at different axial positions of the tunnel is related to the excavation face and has significant spatial distribution characteristics. The stress disturbance is more serious only in the area affected by the excavation face. The stress disturbed degree along the radial direction of the tunnel decreases gradually from the tunnel wall to deep into the surrounding rock. The depth of stress disturbance increases when the excavation surface is close to the monitoring section and decreases gradually after the excavation face leaves. SDI at the wall is the largest，but the disturbed degree of the principal stress direction is not necessarily the largest，and the peak value position varies with the position of the excavation face. The proposed index has a clear physical meaning，which can well describe the variation characteristics of the magnitude and direction of the principal stress. The disturbing degree of the magnitude and direction of the principal stress have the same dimension and are easy to compare. The position with a large degree of stress disturbance corresponds well to the fracture of surrounding rock，which can provide reference for the stability of surrounding rock in deep rock engineering and provide a scientific basis for support design.

Key words： rock mechanics deep tunnel surrounding rock stress stress disturbance index principal stress direction tensor distance

引用本文:

郑民总1，2，李邵军1，冯泽杰1，2，曾志3，薛涛3. 基于张量距离的深埋隧洞围岩应力扰动指标及特征分析[J]. 岩石力学与工程学报, 2023, 42(S1): 3447-3457.
ZHENG Minzong1，2，LI Shaojun1，FENG Zejie1，2，ZENG Zhi3，XUE Tao3. Stress disturbance index and characteristic analysis of surrounding rock mass based on tensor distance in the deep tunnel. , 2023, 42(S1): 3447-3457.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0695 或 https://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3447