摘要
从滚石运动轨迹确定出发,基于数值模拟方法对云南省澜沧江沿岸某在建桥梁桥址区滚石高发边坡进行滚石滚落数值模拟,确定滚石运动特征。基于获得的滚石运动特征,使用Ls-dyna对滚石撞击柔性防护结构响应进行分析,获得拦石网动态响应特征。分析结果表明:滚石运动特征与边坡形式及覆盖层特征相关,在模拟假设条件下,与滚石质量相关性并不明显;重点关注的3个撞击参数拦石网最大变形、冲击力峰值和接触时间均表现出与撞击速度和滚石半径较好的线性相关性;柔性防护网在对不同半径滚石撞击下表现出明显的"子弹效应",小半径滚石穿透拦石网所需动能明显小于大半径滚石。
Based on the method of dynamic finite element analysis, Rockfall was used to simulate the rockfall trajectory at a slope of Lancang River in Yunnan province, China. The obtained rock- fall motion characteristics were introduced to analyze the dynamic response of the flexible protec- tion nets with the Ls-dyna. The results show that the motion characteristics of falling rocks are related with the form and surface layer characteristics of slope, but their relation with falling rocks mass is not obvious. The maximum deformation, the maximum impact force and the con- tact time are strongly correlated with the impact velocity and the dimensions of rocks. At the same time, the so-called ＂bullet effect＂ is accurately verified. A small rock needs less kinetic en- ergy than the relatively large rocks when it penetrates the rockfull protection nets. 1 tab, 15 figs, 12 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第6期59-66,共8页
Journal of Chang’an University(Natural Science Edition)
关键词
桥梁工程
滚石
数值模拟
耗能机理
柔性防护网
“子弹效应”
bridge engineering
rockfall
numerical simulation
energy dissipation mechanism
flexible protection net
bullet effect
