Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (8): 2419-2431.doi: 10.16285/j.rsm.2022.1356

• Numerical Analysis • Previous Articles     Next Articles

Dynamic stability analysis of rock slope considering the strength vibration degradation of through-type rock discontinuities

XU Bin1, 2, 3, 4, LIU Xin-rong3, ZHOU Xiao-han3, LIANG Yue1, 2, 4, ZHONG Zu-liang3, LIU Jun5, DENG Zhi-yun6   

  1. 1. School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing 400047, China; 3. School of Civil Engineering, Chongqing University, Chongqing 400045, China; 4. National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China; 5. China Construction Second Engineering Bureau Ltd., Beijing 100160, China; 6. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
  • Received:2022-09-02 Accepted:2022-12-30 Online:2023-08-21 Published:2023-08-21
  • Supported by:
    This work was supported by the China Postdoctoral Science Foundation (2023M730432), the Special Funding for Chongqing Postdoctoral Research Project (2022CQBSHTB1010), the Chongqing Postdoctoral Science Foundation (CSTB2023NSCQ-BHX0223), the Open Foundation of the Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University (SLK2023A03), the Postdoctoral Science Foundation of Chongqing Jiaotong University (22JDKJC-A008).

PDF (Chinese)

187

Abstract: The shear strength vibration degradation of the rock discontinuities is of great significance to analyze and evaluate the dynamic stability of rock slope. Based on the rock dynamic test, the strength vibration degradation coefficient equation of the rock discontinuities affected by multiple factors was obtained. Then, combined with the limit equilibrium theory and the principle of dynamic vector method, the UDEC program was used for calculation, and its built-in Fish language was used to program to update the strength characteristic parameters of the rock discontinuities in real time and capture the seismic inertia force of slope at any time of earthquake duration, and the minimum average safety coefficient method was adopted to solve the final dynamic stability evaluation index. Thereby, a dynamic algorithm of slope dynamic stability coefficient considering the strength vibration degradation of the rock discontinuities was proposed. The results show that: (1) The strength vibration degradation coefficient of the rock discontinuities is a dynamic variable that depends on the response value of the number and amplitude of cyclic shearing and the relative motion speed between rock blocks. (2) The algorithm is applied to the calculation example of the dynamic stability of slope with the through-type and straight rock discontinuities. The analysis results show that in the dynamic action time history, the attenuation of the dynamic stability coefficient of slope considering the strength vibration degradation of the rock discontinuities is more obvious than that without considering the effect, i.e. the calculation results of the former are more in line with the actual observation, which verify the feasibility of the proposed algorithm. (3) The minimum strength vibration degradation coefficient of the rock discontinuities decays gradually in the form of negative exponential function with the time-history change of dynamic excitation. The larger the initial cohesion (internal friction angle) of the rock discontinuities is, the smaller the slope angle (layer inclination) or dynamic load amplitude (frequency) is, the larger the minimum dynamic stability coefficient of slope during the earthquake duration is, and the relatively stronger the final dynamic stability of slope is at this time.

Key words: rock discontinuities, strength vibration degradation, numerical realization, dynamic stability of slope, influence factor

CLC Number: 

  • TU 457
[1] LI Xin-zheng, WANG Shu-hong, HOU Qin-kuan, DONG Fu-rui. A stepwise clustering method of rock discontinuities dominated by multivariate parameters based on t-SNE [J]. Rock and Soil Mechanics, 2024, 45(5): 1540-1550.
[2] YIN Jing-han, CUI Zhen, SHENG Qian, CHEN Jian, ZHANG Mao-chu, . Shear mechanical characteristics evolution and influencing factors of rock discontinuities under cyclic loading [J]. Rock and Soil Mechanics, 2023, 44(1): 109-118.
[3] ZENG Zhao-tian, LIANG Zhen, SUN Ling-yun, FU Hui-li, FAN Li-yun, PAN Bin, YU Hai-hao, . Experimental study on the influence factors of thermal conductivity of cement-bonded calcareous sand [J]. Rock and Soil Mechanics, 2022, 43(S1): 88-96.
[4] ZHANG Jin-xun, ZHAO Gang, HAN Yu-zhen, ZHANG Lei, . A design method of integrated dewatering and recharge in phreatic zone [J]. Rock and Soil Mechanics, 2022, 43(11): 3107-3116.
[5] YANG Jun, WEI Qing-long, WANG Ya-jun, GAO Yu-bing, HOU Shi-lin, QIAO Bo-wen, . Roof deformation mechanism and control measures of pillarless mining with gob-side entry retaining by roof cutting and pressure relief [J]. Rock and Soil Mechanics, 2020, 41(3): 989-998.
[6] GE Yun-feng, ZHONG Peng, TANG Hui-ming, ZHAO Bin-bin, WANG Liang-qing, XIA Ding, QIU Ya-shi, LI Peng-fei, ZHANG Li, WEN Lian, CAO Tian-ci, . Intelligent measurement on geometric information of rock discontinuities based on borehole image [J]. Rock and Soil Mechanics, 2019, 40(11): 4467-4476.
[7] XIA Cai-chu, Lü Zhi-tao, HUANG Ji-hui, LI Qiang, . Semi-analytical method of maximum frozen depth calculation in cold region tunnel [J]. , 2018, 39(6): 2145-2154.
[8] SONG Lei-bo, JIANG Quan, LI Yuan-hui, YANG Chen-xiang, ZHONG Shan, ZHANG Mei-zhu,. Stability of statistical parameters of discontinuities morphology and anisotropy based on different sampling intervals [J]. , 2017, 38(4): 1121-1132.
[9] SONG Lei-bo1, JIANG Quan, LI Yuan-hui, YANG Cheng-xiang, RAN Shu-guang, WANG Bai-lin, LIU Ting,. Description of discontinuities morphology based on shear behavior [J]. , 2017, 38(2): 525-533.
[10] GE Yun-feng, CHEN Yong, WANG Liang-qing, HUO Shao-lei, . Estimation of 3D joint matching coefficient of rock discontinuities using point cloud data alignment technology [J]. , 2017, 38(11): 3385-3393.
[11] LI Peng, TAN Xiao-hui, XIN Zhi-yu, WANG Xue, XIE Yan,. Numerical simulation of determination of equilibrium time for osmotic technique [J]. , 2017, 38(11): 3363-3370.
[12] FU Hua, ZHAO Da-hai, HAN Hua-qiang, LING Hua,. Experimental study of influence of gradation on dynamic properties of coarse aggregate [J]. , 2016, 37(8): 2279-2284.
[13] RONG Chui-qiang, ZHAO Xiao-hua, ZOU Yu,. Parameter analysis of three-dimensional interference minimum point and its location determination in low strain integrity testing of piles [J]. , 2016, 37(6): 1818-1824.
[14] ZHANG Zhi-guo , ZHANG Meng-xi , WANG Wei-dong,. Analysis of soil vertical additional loads induced by pipe jacking construction [J]. , 2014, 35(S2): 121-128.
[15] WANG Yun-long, TAN Zhong-sheng. Structural instability analysis and prevention measures of structural collapse in Muzhailing slate tunnel [J]. , 2012, 33(S2): 263-268.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd