路堤震害风险概率评价与管理研究

发布时间：2018-09-18 15:15

【摘要】：路堤震害在破坏性地震中十分普遍,开展路堤震害风险概率评价并提出合理的震害风险管理方法对提高公路抗震能力和区域防灾减灾能力具有重要意义。进行路堤震害等级划分,选取路堤震害损伤参数,建立路堤震害等级与震害损伤参数的对应关系;以连霍高速公路西宝段K1125+470处路堤为例开展基于CPSHA的公路地震危险性评价,基于IDA和PSDA的路堤震害易损性评价以及基于危险性曲线的路堤震害风险概率评价;在明确路堤震害风险可接受度的基础上提出路堤震害风险管理方法,验证挡土墙对提高路堤抗震性能的积极作用。研究结果表明:连霍高速公路西宝段地震危险性评价结果比第四代地震区划图略高,这与目前渭河断陷盆地地震活跃的现实是一致的;PGA(PGA为地震动峰值加速度)达到0.6 g时,路堤超越严重损伤的概率为65.910%,达到0.8 g时,超越严重损伤的概率为99.995%,说明路堤震害易损性较高;路堤未来50 a超越严重损伤的风险概率为36.46%,发生基本完好和轻微损伤的风险概率为28.49%;以路堤未来50 a发生毁坏的风险概率40%为风险可接受度,路堤震害风险管理方法适用于新建路堤的抗震设计和已建路堤的抗震加固;未来50 a有挡土墙路堤超越严重损伤的风险概率比无挡土墙路堤低15.29%,发生基本完好和轻微损伤的风险概率比无挡土墙路堤高15.62%。
[Abstract]:Embankment earthquake damage is very common in destructive earthquakes. It is of great significance to develop the probability evaluation of embankment damage risk and put forward a reasonable risk management method to improve the anti-seismic capacity of highway and the ability of regional disaster prevention and mitigation. The grade of earthquake damage of embankment is divided, the damage parameter of embankment is selected, the corresponding relation between damage level and damage parameter of embankment is established, taking the embankment of Xibao section of Lianhuo Expressway as an example, the seismic risk assessment of highway based on CPSHA is carried out. The vulnerability evaluation of embankment earthquake damage based on IDA and PSDA and the risk probability evaluation of embankment earthquake damage based on hazard curve are presented, and the risk management method of embankment earthquake damage risk is put forward on the basis of defining the acceptable degree of embankment earthquake damage risk. Verify the positive effect of retaining wall on improving the seismic performance of embankment. The results show that the seismic risk assessment results of Xibao section of Lianghuo Expressway are slightly higher than those of the fourth generation seismic zoning map, which is consistent with the fact that the seismic activity of Weihe River fault basin is in line with the fact that the peak acceleration of ground motion (PGA) is 0. 6g. The probability of serious damage of embankment is 65.910g, when it reaches 0.8 g, the probability of serious damage is 99.995g, which shows that the vulnerability of embankment to earthquake damage is high. The risk probability of the embankment exceeding serious damage in the next 50 years is 36.46, the risk probability of the basic intact and slight damage is 28.49, and the risk probability of destruction of the embankment in the next 50 years is 40% as the risk acceptability. The risk management method of embankment earthquake damage is suitable for aseismic design of new embankment and seismic reinforcement of existing embankment. In the next 50 years, the risk probability of serious damage of embankment with retaining wall is 15.29 lower than that of unretaining embankment, and the risk probability of occurrence of basic intact and slight damage is 15.62% higher than that of unretaining wall embankment.
【作者单位】：山东理工大学建筑工程学院;长安大学特殊地区公路工程教育部重点实验室;山东理工大学交通与车辆工程学院;
【基金】：山东省自然科学基金资助项目(2015ZRB019JS) 山东省中青年科学家奖励基金项目(BS2015SF016) 山东理工大学博士科研启动项目(415046)~~
【分类号】：U416.12

【相似文献】