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临空面的几何形状在边坡破坏模式与稳定性分析中起着举足轻重的作用。运动学分析是确定边坡破坏模式与评价边坡稳定性的一种有效方法。目前基于运动学分析的边坡稳定性研究主要集中于单临空面边坡的破坏模式与最大安全开挖边坡角的确定。本文将此项研究扩展至双临空面边坡,将其破坏模式细分为4种,分别为沿结构面发生单平面滑动、沿结构面发生楔形体滑动、沿两个结构面的交线发生楔形体滑动以及倾倒破坏。在立体投影中得出,平滑滑动与楔形体滑动的滑动区为双临空面真倾向线与摩擦圆所组成的区域,单个结构面倾角矢量与两个结构面交线矢量位于该区城内;倾倒破坏区为双临空面真倾向线、摩擦圆与基圆所组成的区域,结构面的法向矢量位于该区城内。提出了双临空面边坡最大安全开挖边坡角的确定方法及边坡设计原则。最后将上述方法应用于三峡库区湖北省秭归县郭家坝镇郭家坝村生基坡高边坡,研究了该双临空面边坡的破坏模式并给出了最大安全边坡角的建议值。
The geometry of the plane faces plays a decisive role in slope failure mode and stability analysis. Kinematic analysis is an effective method to determine the failure mode of slope and evaluate the slope stability. At present, the research on slope stability based on the kinematics analysis mainly focuses on the failure mode of the single temporary empty surface slope and the determination of the maximum safe excavation slope angle. In this paper, the study is extended to double-apron surface slope, and the failure modes are subdivided into four types: single-plane sliding along the structural plane, wedge sliding along the structural plane and intersection along the two structural planes Wedge sliding and dumping damage occurred. It is concluded from the stereoscopic projection that the sliding zone of smooth sliding and wedge sliding is the region composed of the true dip line and the friction circle of the double projectile plane. The intersection vector of the single structural plane dip vector and the two structural planes is located in the city; The dumping spoilage zone is a zone consisting of true dip line, friction circle and base circle, and the normal vector of structure plane is located in the city. The method to determine the slope angle of the maximum safety excavation of the double-bladed surface slope and the principle of slope design are proposed. Finally, the above method is applied to the high slope of Shengji slope in Guojiaba village, Guojiaba town, Zigui county, Hubei province in the Three Gorges Reservoir Area. The failure mode of the slope with double twin surface is studied and the maximum safe slope angle suggested value.