降雨入渗与开挖卸荷共同作用下边坡角对裂隙岩体的影响
论文题目
Effect of slope angle on fractured rock masses under combined
influence of variable rainfall infiltration and excavation unloading
Xiaoshuang Lia,b, Qihang Lic,*, Yunmin Wangd,Wei Liuc, Di Houe,Chun Zhuf
b. College of Civil Engineering, Qilu Institute of Technology, Jinan, 250200, China
c. School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China
d. Sinosteel Maanshan General Institute of Mining Research Co. Ltd., Maanshan, 243000, China
e. Guizhou Survey and Design Research Institute for Water Resources and Hydropower, Guiyang, 550001, China
f. School of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, China
研究内容
Abstract: Intense precipitation infiltration and intricate excavation processes are crucial factors that impact the stability and security of towering and steep rock slopes within mining sites. The primary aim of this research was to investigate the progression of cumulative failure within a cracked rock formation, considering the combined effects of precipitation and excavation activities. The study was conducted in the Huangniuqian eastern mining area of the Dexing Copper Mine in Jiangxi Province, China. An engineering geological investigation was conducted, a physical model experiment was performed, numerical calculations and theoretical analysis were conducted using the matrix discrete element method (MatDEM), and the deformation characteristics and the effect of the slope angle of a fractured rock mass under different scenarios were examined. The failure and instability mechanisms of the fractured rock mass under three slope angle models were analyzed. The experimental results indicate that as the slope angle increases, the combined effect of rainfall infiltration and excavation unloading is reduced. A novel approach to simulating unsaturated seepage in a rock mass, based on the van Genuchten model (VGM), has been developed. Compared to the vertical displacement observed in a similar physical experiment, the average relative errors associated with the slope angles of 45°, 50°, and 55° were 2.094%, 1.916%, and 2.328%, respectively. Accordingly, the combined effect of rainfall and excavation was determined using the proposed method. Moreover, the accuracy of the numerical simulation was validated. The findings contribute to the seepage field in a meaningful way, offering insight that can inform and enhance existing methods and theories for research on the underlying mechanism of ultra-high and steep rock slope instability, which can inform the development of more effective risk management strategies.
Keywords: Open-pit to underground excavation; Rainfall infiltration; Similarity simulation, Numerical simulation; Image recognition; Slope angle
Fig. 7. Principle of seepage simulation: (a, b) Flow boundary and the corresponding time–height–water content curves, respectively; and (c, d) Pressure boundary and the corresponding time–height–water content curves, respectively.
Fig. 8. Seepage simulation effect: (a) 2D model; (b) 3D model; and (c) Specified fissure seepage.
Fig. 9. (a) Numerical simulation flowchart; (b) Model simulation diagram; (c) Monitoring point layout; (d) Stress distribution field; and (e) Water distribution field.
Fig. 15. Numerical calculation results for the rock mass stress distribution in the different models.
Fig. 19. Comparing the results derived from numerical simulation and similar physical simulation for the different models.
了解详情
Li, X., Li, Q., Wang, Y., Liu, W., Hou, D., & Zhu, C. (2024). Effect of slope angle on fractured rock masses under combined influence of variable rainfall infiltration and excavation unloading. Journal of Rock Mechanics and Geotechnical Engineering, 16(2024), 4154-4176.
https://doi.org/10.1016/j.jrmge.2024.08.019
