边坡工程监测中,虽然能够准确获得边坡的坡面位移,但却不能直接判断边坡动态稳定性.为此,特建立顺层岩石边坡变形演化过程的数值计算模型,采用FLAC3D内置的遍布节理本构模型模拟岩体,并按强度折减法降低边坡岩体抗剪强度参数,获得边坡空间位移信息及坡面关键点位移-安全系数的相关关系.分析结果表明:边坡体从稳定发展至整体失稳,坡体变形经历了匀速变形、加速变形和剧烈变形3个阶段;关键点位移-安全系数之间具有良好的函数关系;空间位移特征与破坏模式相关,滑移拉裂破坏模式、顺层滑移破坏模式、压溃破坏模式分别从"r"形和三角形发展至整体失稳的"U"形.据此提出顺层岩质边坡动态稳定的位移分析方法.%In slope project supervision, though slope displacement of side slope can be precisely obtained, the stability of side slope cannot be directly determined. This paper established numeric calculating model to demonstrate the bedding rock slope displacement process, it adopts FLAC3D internal ubiquitous-joint constitutive model to simulate rock body, and reduce side slope rock anti-shearing strength parameters per strength reduction method, to obtain side slope displacement information and relationship between slope key point displacement and safety coefficient. Result of analysis show: For side slopes, from stable development to instability, the slope deformation experiences 3 stages of uniform deformation, accelerated deformation and severe deformation;There is good functional relationship between key point displacement-safety coefficient; The spatial displacement characteristics are related to failure modes, the slip failure mode, bedding-slip failure mode and collapse failure mode are respectively developed from "R" form to triangle form then to wholly instable "U" form. A displacement analysis method for dynamic stability of bedding rock slope is suggested based on this.
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