加锚隐伏顺层岩质边坡滑剪破坏分析方法研究

doi:10.13722/j.cnki.jrme.2023.0127

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摘要全长黏结型锚杆在边坡加固工程中得到广泛应用，但加锚隐伏顺层岩质边坡的锚固机制和评价方法还需进一步发展和完善。基于加锚隐伏顺层岩质边坡滑剪破坏机制建立滑体柱状力学模型，采用极限平衡原理结合锚杆抗力贡献提出该类滑剪破坏分析方法，在此基础上开展锚固角度和锚杆直径对加锚边坡稳定性影响的讨论分析，并将理论分析结果与离散元软件(UDEC)计算结果进行对比分析。研究结果表明，全长黏结型锚杆的拉剪耦合作用增加了滑体的抗滑能力；锚杆加固隐伏顺层岩质边坡存在一个最优锚固角度，这个角度近似为层面摩擦角值大小；加锚隐伏顺层边坡的稳定性随锚杆直径增大呈幂函数的提高趋势；数值模拟和理论计算结果吻合较好，验证了所提分析方法的合理性和准确性。研究成果对该类边坡的稳定性评价和治理设计具有指导意义。

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	孙朝燚
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关键词 ：边坡工程, 全长黏结型锚杆, 岩质边坡, 隐伏顺层边坡, 极限平衡, 分析方法

Abstract：Fully-grouted bolts are widely used in slope reinforcement projects，but the anchoring mechanism and evaluation method of bolt-supported concealed bedding rock slopes need to be developed and improved. In this work，a new columnar mechanical model was established according to the sliding shear failure mechanism of bolt-supported concealed bedding rock slopes. Subsequently，the stability analysis method of such slopes was proposed using the limit equilibrium approach combined with the resistance contribution of the bolts. On this basis，the effects of the bolt angle and diameter on the stability of the bolted slopes were discussed. In addition，the analytical results were compared with those calculated by the discrete element modeling(UDEC). The results show that the tensile-shear coupling of the fully-grouted bolts increases the slip resistance of the sliding body. There is an optimal bolt angle that maximizes the stability of the bolted concealed bedding rock slopes，with a value approximately equal to the friction angle of the bedding plane. The slope stability also increases with increasing the bolt diameter by a power function. The simulation and analytical results are in good agreement，thus verifying the rationality and accuracy of the proposed analysis method. The research results are of guidance for stability evaluation and treatment design of this type of slope.

Key words： slope engineering fully grouted bolts rock slopes concealed bedding slopes limit equilibrium analysis method

引用本文:

孙朝燚，陈从新，郑允，刘才华. 加锚隐伏顺层岩质边坡滑剪破坏分析方法研究[J]. 岩石力学与工程学报, 2023, 42(10): 2456-2465.
SUN Chaoyi，CHEN Congxin，ZHENG Yun，LIU Caihua. A stability analysis method of bolt-supported concealed bedding rock slopes against sliding shear failure. , 2023, 42(10): 2456-2465.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0127 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I10/2456

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