崩塌滚石消能桩结构设计计算方法

提出了一种利用桩-土材料的弹塑性性质,将崩塌滚石的冲击动能转化为土体和桩体的弹塑性变形,从而降低崩塌滚石运动速度,拦截滚石的消能桩结构.基于能量守恒定律和弹性地基梁法,推导了消能桩系统在滚石冲击作用下的变形计算公式.对于消能桩的设计,根据勘察资料获取滚石的粒径、下落高度并考虑坡面条件等因素可以估算其运动动能,采用推导公式可计算出消能桩在给定控制变形量条件下的耗能量,从而可以确定消能桩的设计.通过两个崩塌滚石实例对计算模型的运用进行说明,实例计算结果也表明了计算模型具有较好的实用性.

The Design Method of Energy Dissipation Pile for Rockfall Prevention

The mechanism of the energy dissipation pile presented in this paper lies in the plasticity of soil. When the falling rocks impact the pile, the kinetic energy is transformed into the deformation of soil and pile, so the velocity of rocks is lowered. Based on the energy conservation law, Elastic foundation beam method, a method for the design of the energy dissipation pile is presented. In the design of energy dissipation piles, the initial kinetic energy of rockfall can be calculated by the properties of rockfall, such as boulder size, height of rock initiation and parameters of slope surface which can be obtained from field investigation. Then the presented model can be used to get the basic parameters for the energy dissipation piles. Two examples are presented to illustrate the validation of the model. It shows that the energy dissipation pile presented in this paper can be a good choice in rockfall prevention in engineering practice.