应力分析机制下岩质边坡后缘张裂缝位置与深度求解方法

doi:10.13722/j.cnki.jrme.2023.1112

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Abstract The presence of tension cracks at the rear edge of a slope can significantly impact the stability of rock slopes. Effectively predicting the precise location and depth of these tension cracks is crucial for conducting a reliable analysis of the stability of rock slopes that exhibit such features. A novel method has been developed for rock slopes lacking joints or featuring four or more joints，aiming to determine the location and depth of tension cracks at the rear edge of rock slopes by considering the underlying formation mechanism of these cracks. First，the nonlinear generalized Hoek-Brown(GHB) strength criterion is applied to incorporate the influence of joints into the calculation of rock mass strength. Then，focusing on the vertical development characteristics of tension cracks at the rear edge of the slope，the horizontal stress state of the rock mass at this location is identified as a crucial factor influencing the formation and progression of tension cracks. Thereby，a micro-wedge unit mechanical analysis model is proposed to obtain the horizontal stresses of the rock mass at the rear edge of slope. Finally，leveraging the top-down development pattern of vertical tension cracks at the rear edge of slope and the relationship between the ultimate stress level of these cracks and the tensile strength of the rock mass，a discriminant formula is formulated to determine the location and depth of tension cracks at the rear edge of the rock slope. The rationality and validity of the present method have been confirmed through comparisons with numerical simulation methods，laboratory test results，and engineering data. These research findings will establish a theoretical foundation for predicting the location and depth of tension cracks at the rear edge of rock slopes, thereby facilitating reliable stability analysis of rock slopes with tension cracks at the rear edge.

Key words： slope engineering rock slope tension crack nonlinear GHB strength criterion horizontal stress at the rear edge of slope depth of tension crack initial cracking position

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	Articles by authors
	DENG Dongping
	PENG Yihang
	CHEN Haoyu

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DENG Dongping,PENG Yihang,CHEN Haoyu. A novel method for solving the location and depth of tension cracks at the rear edge of rock slopes under stress analysis mechanism[J]. , 2024, 43(8): 1978-1997.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.1112 OR http://rockmech.whrsm.ac.cn/EN/Y2024/V43/I8/1978

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