Stability analysis of tunnel surrounding rock considering influence of damage and dilatancy

doi:10.16265/j.cnki.issn1003-3033.2020.07.024

Abstract

Abstract: In order to solve supporting problems of surrounding rock after tunnel excavation under complex geological structure, surrounding rock was divided into elastic zone and plastic zone according to characteristics of its stress distribution curves. Then, an elastoplastic damage constitutive model was developed following Drucker Prager yield criterion, and its mechanical performance degradation caused from damages and dilatancy under unloading were analyzed. Finally, an analytical solution of elastic-plastic zone was deduced. The results show that support resistance and plastic areas' shift increase obviously as injury and dilatancy degree intensifies. The bigger radius of plastic zone is, influence on surrounding rock stability is deeper within a certain range since tangential stress peak is far away from tunnel wall. And along with increase of intermediate principal stress coefficient, support resistance decreases, which is more favorable to optimization of support parameters with an consideration to the former.

Key words: damage, dilatancy effect, surrounding rock of tunnel, elasticplastic, stress

CLC Number:

X935

GAO Zhaoning, CHEN Dengguo, SUN Zhenchuan, YANG Yandong, LI Shunshun. Stability analysis of tunnel surrounding rock considering influence of damage and dilatancy[J]. China Safety Science Journal, 2020, 30(7): 159-165.

References

[1] 康红普,王金华,林健.煤矿巷道支护技术的研究与应用[J].煤炭学报, 2010, 35 (11): 1 809-1 814.
KANG Hongpu, WANG Jinhua, LIU Jian. Study and applications of roadway support techniques for coal mines [J]. Journal of China Coal Society, 2010, 35(11): 1 809-1 814.
[2] 赵光明,张小波,孟祥瑞,等. 基于连续损伤理论的巷道围岩弹脆性损伤分析[J].地下空间与工程学报, 2016, 12(2): 314-321.
ZHAO Guangming, ZHANG Xiaobo, MENG Xiangrui, et al. Elasto-brittle damage analysis of roadway surrounding rock based on continuous damage theory[J]. Chinese Journal of Underground Space and Engineering, 2016, 12 (2): 314-321.
[3] 朱传奇,殷志强,李传明,等. 考虑应变硬化和扩容特性的巷道围岩稳定性分析[J]. 中国安全科学学报, 2016, 26(6): 157-162.
ZHU Chuanqi, YIN Zhiqiang, LI Chuanming, et al.Stability analysis of surrounding rock of roadway considering both strain hardening and dilatancy feature[J]. China Safety Science Journal, 2016, 26 (6): 157-162.
[4] 姚国圣,李镜培,谷拴成. 考虑岩体扩容和塑性软化的软岩巷道变形解析[J]. 岩土力学, 2009, 30(2): 463-467.
YAO Guosheng, LI Jingpei, GU Shuancheng. Analysis of soft rock roadway deformation considering rock mass expansion and plastic softening [J]. Rock and Soil Mechanics, 2009, 30 (2): 463-467.
[5] 蒋斌松,张强,贺永年,等. 深部圆形巷道破裂围岩的弹塑性分析[J]. 岩石力学与工程学报, 2007, 26(5): 982-986.
JIANG Binsong, ZHANG Qiang, HE Yongnian, et al. Elastoplastic analysis of cracked surrounding rocks in deep circular openings[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(5):982-986.
[6] 潘继良,高召宁,郑志伟,等. 考虑损伤与剪胀及中间主应力的巷道围岩弹塑性分析[J]. 中国安全生产科学技术, 2017, 13(2): 40-45.
PAN Jiliang, GAO Zhaoning, ZHENG Zhiwei, et al. Elasto-plastic analysis on surrounding rock of roadway considering damage, shear dilation and intermediate principal stress[J]. Journal of Safety Science and Technology, 2017, 13(2): 40-45.
[7] 李波波,张尧,任崇鸿,等. 三轴应力下煤岩损伤-能量演化特征研究[J].中国安全科学学报,2019,29(10): 98-104.
LI Bobo, ZHANG Yao, REN Chonghong, et al. Study on the damage - energy evolution characteristics of coal and rock under triaxial stress [J].China Safety Science Journal, 2019,29(10): 98-104.
[8] 李忠华,官福海,潘一山. 基于损伤理论的圆形巷道围岩应力场分析[J]. 岩土力学, 2004, 25 (增2): 160-163.
LI Zhonghua, GUAN Fuhai, PAN Yishan. Analysis of stress field of rock surrounding circular roadway based on damage theory[J]. Rock and Soil Mechanics, 2004, 25(S2):160-163.
[9] 孟龙,高召宁,孟祥瑞. 考虑损伤的圆形巷道围岩弹塑性分析[J].中国安全科学生产技术, 2013, 9 (11): 11-16.
MENG Long, GAO Zhaoning, MENG Xiangrui.Elasto-plastic analysis of circular roadway surrounding rocks under consider ation of rock damage[J].Journal of Safety Science and Technology, 2013, 9(11): 11-16.
[10] 刘万荣,马海峰. 考虑中间主应力的地下硐室围岩稳定性分析[J]. 中国安全科学学报, 2014, 24 (9): 116-121.
LIU Wanrong, MA Haifeng. Stability analysis of surrounding rock of underground tunnel considering intermediate principal stress[J]. China Safety Science Journal, 2014, 24 (9): 116-121.
[11] 潘一山,徐秉业. 考虑损伤的圆形洞室岩爆分析[J]. 岩石力学与工程学报, 1999, 18(2): 152-156.
PAN Yishan, XU Bingye. The rockburst analysis of circular chamber under consideration of rock damage[J]. Chinese Journal of rock Mechanics and Engineering, 1999, 18(2):152-156.
[12] 贾乃文. 粘塑性力学及工程应用[M]. 北京:地震出版社, 2000: 76-78.
[13] 张小波,赵光明,孟祥瑞,等. 考虑非线性脆性损伤和中间主应力影响的圆形巷道围岩分析[J]. 煤炭学报, 2014, 39(增2): 339-346.
ZHANG Xiaobo, ZHAO Guangming, MENG Xiangrui, et al. Analysis on surrounding rock of circular roadway considering nonlinear brittle damage and intermediate principal stress[J]. Journal of China Coal Society, 2014, 39(S2):339-346.
[14] 郑颖人. 地下工程围岩稳定性与设计理论[M]. 人民交通出版社, 2012: 60-61.
[15] 陈梁,茅献彪,李明,等. 基于Drucker-Prager准则的深部巷道破裂围岩弹塑性分析[J]. 煤炭学报, 2017, 42(2): 484-491.
CHEN Liang, MAO Xianbiao, LI Ming,et al.Elastoplastic analysis of cracked surrounding rock in deep roadway based on Drucker Prager criterion[J]. Journal of China Coal Society, 2017, 42 (2): 484-491.