基于落石计算的半刚性拦石墙设计

Design of Semi-Rigid Rockfall Barrier Wall Based on Rockfall Simulation

为克服传统刚性拦石墙截面大、场地适宜性差、抗冲击能力有限的不足，提出一种半刚性拦石墙结构。该结构以桩板体系为主要受力构件，背后填筑缓冲土堤，在有效增强结构抗冲击力能力的同时，保证结构体系布设的灵活性和场地的适宜性。半刚性拦石墙的布设应在对陡崖沿线所有代表性剖面落石运动路径预测和弹跳高度计算的基础上，结合现场地形情况，优选坡度缓、落石弹跳高度小、运动速度小、远离被保护对象的位置，其走向延伸长度选取保护区段长度加5～10m长的安全储备，有效拦截高度选取走向沿线各计算剖面落石最大弹跳高度加1m高的安全储备。改进了落石冲击力计算方法，并以落石对缓冲土堤的冲击力和土压力为荷载依据进行半刚桂拦石墙的结构设计。

Since conventional rigid rockfall barrier wall usually has a massive cross section, many field limits and limited kinetic energy absorption capability, a semi-rigid rockfall barrier wall is presented. The structure chooses pile-plate system as the retaining components. And the filling embankment behind the pile-plate system serves as the anti-impact component. This design conception can strengthen the anti-impact ability effectively and guarantee the design flexibility and venues suitability. The design of semi-rigid rockfall barrier wall must base on rockfall trajectory and bouncing height calculation, combining with ven- ues terrain conditions, choose the location of gentle slope, small bouncing height and velocity, and far away from protected areas. The length of semi-rigid rockfall barrier wall can select its protection segment length plus 5-10 m long security reserve. And its effective interception height can select the largest bouncing height of all calculating profiles along the cliff plus 1 m high security reserve. The rockfall impact force calculating method was improved. And the impact force and earth pressure is the main load basis for the structural design of semi-rigid rockfall barrier wall.