高烈度地震区高路堤桩板墙的动力响应研究  

Research on the Dynamic Response of Pile-plank Wall for High Embankment in High Intensity Seismic Area

作　　者：蒋楚生[1] 李庆海[1] 曹新文[2] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]西南交通大学,成都610000

出　　处：《铁道工程学报》2015年第3期21-24,89,共5页Journal of Railway Engineering Society

摘　　要：研究目的:玉蒙铁路位于云南省境内,地质环境错综复杂并且活跃的新构造运动使得该区域地震多发。对于玉蒙铁路陡坡高路堤工点,设计采用路堤桩板式挡土墙支挡结构加固。为评价路堤桩板结构的抗震性能,研究支挡结构在地震动荷载作用下的稳定、沉降和变形,进行室内振动台模型试验,分析路堤桩板式挡土墙在不同地震加速度作用的动力响应,研究支挡结构的抗震可靠性,并与现行的设计计算方法进行对比分析。研究结论:(1)桩板式挡土墙的水平位移、桩身弯矩、挡土板的土压力随加速度增大而增大;(2)当地震烈度大于等于8度时,试验得到的桩身弯矩和挡土板土压力均较目前规范的拟静力法的计算设计值大,说明地震烈度小于等于7度时,可以按照传统的拟静力法进行设计,而当烈度大于等于8度时,则应该适当增大结构的安全系数;(3)该研究成果已成功应用于广大新双线铁路等高烈度地震区的路堤支挡加固工程中。Research purposes： Yuxi -Mengzi Railway located in Yunnan province belongs to south extension of Qinghai Tibet Plateau, where as the geological environment is complicated there is active neotectonics, earthquake strikes frequently in this region. The high - slope embankment on Yuxi - Mengzi Railway is strengthened by pile - plank wall in the design. For the seismic performance evaluation of pile - plank wall, the vibrating table test was conducted to study the stability, settlement and displacement of pile - plank wall of retaining structure under the seismic load and analyze dynamic response of pile - plank wall under different seismic acceleration. The anti - seismic reliability of the retaining structure is researched, compared and analyzed with the current design and calculation method. Research conclusions： （ 1 ） The horizontal displacement of pile - plank wall , moment of pile body and soil pressure of retaining plate increases with increase of the seismic acceleration. （2）When the seismic intensity is equal to or more than 8 degrees, for the moment of pile body and soil pressure of retaining plate, the test value are more than design value calculated by quasi - static method. This means when the earthquake intensity is less than or equal to 7 degrees, the structure can be designed according to the traditional quasi - static method and when the intensity is equal to or more than 8 degrees, the structure＇s safety factor should be appropriately increased. （3） The results have been successfully applied to the embankment retaining reinforcement engineering of many new double - track railways in high - intensity seismic area.

关 键 词：地震 路堤 桩板墙 高烈度 振动台 

分 类 号：U213.12[交通运输工程—道路与铁道工程]