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通过对白龙江流域既有的泥石流防治工程措施进行现场调研,分析了工程防治理念和防治措施上的问题,提出了新型地锚扶壁式泥石流格栅坝。通过将格栅和扶壁墙离散化为质点串,而拉索以弹簧支座的形式代替,取一榀格栅柱为计算单元,建立相应的动力方程。最后将速度脉冲模型与随机地震地面运动模型联合起来生成近场脉冲型地震动,并以此作为激励,对近场脉冲型地震动作用下新型泥石流格栅坝的地震响应进行了分析。
Through the on-site investigation of existing debris flow prevention and control engineering measures in Bailongjiang River Basin, this paper analyzes the concept of project prevention and control and the problems in prevention and control measures, and proposes a new type of ground-supported debris flow grid dam. By discretizing the grille and the buttress wall into mass strings, the cable is replaced by a spring bearing, and a grid of grillages is taken as the calculating unit to establish a corresponding dynamic equation. Finally, the velocity impulse model and random earthquake ground motion model are combined to generate near-field impulsive ground motions, which are used as excitation to analyze the seismic response of the new debris flow grid dam under near-field impulsive seismic motion.