(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy
of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Science，Beijing 100049，China；
3. Department of Engineering Physics，Tsinghua University，Beijing 100084，China)
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.
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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2023, Vol. 42 
