胡家屯中桥路桥过渡段动力特性试验研究  

Experimental research on dynamic properties of road-bridge transition section of Hujiatun medium bridge

作　　者：陈果元[1] 魏丽敏[2] 杨果林[2] 

机构地区：[1]中南林业科技大学建筑工程与力学学院,长沙410004 [2]中南大学土木建筑学院,长沙410075

出　　处：《振动与冲击》2010年第6期184-188,共5页Journal of Vibration and Shock

基　　金：湖南省自然科学基金资助项目(09JJ6072)

摘　　要：通过对秦沈铁路客运专线胡家屯中桥路桥过渡段进行动力响应现场测试和沉降观测,分析了级配碎石路桥过渡段的沉降规律;动应力、振动加速度、动位移与列车速度的关系,以及动力响应沿路基深度的衰减规律和沿线路纵向变化规律。结果表明:级配碎石过渡段能减缓路桥间沉降差;随着列车速度的提高,列车对路基的动应力作用增强,且动应力影响在基床表层较为显著;不同行车速度下,各测点振动加速度值变化不大,其分布范围一般集中在1 m/s2～3.5m/s2之间;各测点动位移受列车速度的影响不明显,其值集中在0.1 mm～0.35 mm范围内变化。On basis of the in-situ test of dynamic response and sedimentation observation of the road-bridge transition section of Hujiatun medium bridge in Qinhuangdao Shenyang special passenger line,the sedimentation rule of the road-bridge transition section with graded broken stone was analyzed.Researches were made in terms of the relationships of the dynamic stress,vibration acceleration,dynamic displacement with the train velocity,as well as the depthwise attenuation law of the subgrade and the longitudinal change of the dynamic response along the line.The results show that the road-bridge transition section with graded broken stone can reduce the differential settlement;the train's dynamic action upon the bedding goes up with the increase of the train velocity,and the dynamic stress features appear significantly on the bedding surface;the accelerations at measuring points are not significantly affected by the train velocity,ranging from 1m/s2 to 3.5 m/s2;the dynamic displacements are also not significantly affected by the train velocity,whose value intensively ranges from 0.1mm～ 0.35mm.

关 键 词：路桥过渡段 级配碎石 列车运行速度 动力响应 沉降差 

分 类 号：TU452[建筑科学—岩土工程]