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我国位于泥石流沟岸的公路里程累计 80 0 km左右。沟岸冲蚀是公路泥石流研究的主要方面之一 ,是泥石流冲蚀能、岸坡抗蚀能耦合作用的表像。应用地貌学方法将泥石流沟岸冲蚀演绎过程分为 4个阶段 ,即冲蚀槽形成阶段、泥石流顶托底部拉裂阶段、自重顶部拉裂变形阶段和坍塌阶段 ,核心是悬岸的产生及失稳。大量调查发现 ,沟岸坍塌失稳均主要发生在泥石流暴发期间 ,其主要原因是泥石流对岸坡的冲蚀作用使得岸坡产生纵向振动 ,增加荷载效应 ,减小了悬岸岩土体的刚度 ,进而诱发了悬岸体的坍塌。运用动力学方法建立了悬臂体系的纵向振动位移方程 ,据此应用牛顿第二定律便可求解获得泥石流振动对岸坡破坏的诱发荷载 ,并对护岸结构关键技术进行了探讨
China’s highway mileage in debris flows along the bank 80 0 km total. Ditch bank erosion is one of the main aspects of road debris flow research, is the erosion of debris flow energy, corrosion resistance can be coupled role of the surface. The geomorphic method is used to divide the process of debris flow evacuation into four stages, that is, the formation stage of erosion trough, the bottom cracking stage of debris flow top support, the cracking stage and the collapsing stage of top weight, Instability. A large number of investigations found that the collapse and collapse of the ditch bank occurred mainly during the outbreak of debris flow, mainly due to the erosion of the bank slope by the debris flow, which caused the longitudinal vibration of the bank slope, increased the load effect and reduced the rigidity of the suspended rock and soil mass, Which in turn induced the collapse of the suspended body. The longitudinal vibration displacement equation of the cantilever system was established by using the dynamic method. According to the Newton’s second law, the induced load of the debris flow vibration on the bank slope can be solved and the key technologies of bank revetment were discussed