Blasting response and stability evolution of high slope in open-pit mine subjected to rainfall infiltration

IF 4.2 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2025-01-15 DOI:10.1007/s10064-025-04086-5

Gengqian Nian, Zheng Cong, Zhonghui Chen, Jian Cao, Hui Xu

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引用次数: 0

Abstract

Rainfall and blasting are the main factors inducing landslide on open-pit slopes, however, the combined effect of both factors on the slope stability remains insufficiently understood. In this study, the secondary development of the seepage module is conducted using FISH language in the FLAC3D software to calculate unsaturated seepage. Focusing on the high slope of Dagushan open-pit mine, the responses of horizontal velocity and displacement at the slope monitoring points under different rainfall intensities is investigated. Additionally, the variation of the slope safety factor following blasting at different times during rainfall under the same daily rainfall is examined. The results indicate that the rainwater infiltration reduces the strength of rock mass and increases sensitivity to blasting, as evidenced by the gradual increase in peak velocity and displacement. Once the rainfall ceases, the peak velocity gradually returns to its initial state, while the peak displacement stabilizes at a steady value. Rainwater infiltration has a significant negative impact on the slope stability following blasting. As the daily rainfall increases, the required time between the cessation of rainfall and the resumption of blasting operations progressively lengthens.

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降雨入渗作用下露天矿高边坡爆破响应及稳定性演化

降雨和爆破是诱发露天矿边坡滑坡的主要因素，但两者对边坡稳定性的综合影响尚不清楚。本研究利用FLAC3D软件中的FISH语言对渗流模块进行二次开发，计算非饱和渗流。以大孤山露天矿高边坡为研究对象，研究了不同降雨强度下边坡监测点水平速度和位移的响应。此外，研究了在相同日降雨量条件下，不同降雨时间爆破后边坡安全系数的变化规律。结果表明：雨水入渗降低了岩体强度，增加了岩体对爆破的敏感性，表现为峰值速度和峰值位移逐渐增大；一旦降雨停止，峰值速度逐渐恢复到初始状态，峰值位移稳定在一个稳定的值。雨水入渗对爆破后边坡稳定性有显著的负面影响。随着日降雨量的增加，从停止降雨到恢复爆破作业所需的时间逐渐延长。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.