摘要
以某临近地铁线的深基坑为工程依托,采用人工激励函数确定列车动荷载时程曲线,采用Drucker-Prager土体本构模型对新建深基坑在列车运营时的动力反应进行分析,主要结论如下:①在重力场作用下,土体及隧道区域最大等效应力的最大值出现在土体边坡界面收缩区与隧道交界的区域,最大侧向位移值出现在隧道角部靠近基坑一侧的区域;②在列车动力荷载作用下,土体及隧道区域等效应力最大值出现在地铁轮压与地面作用区域,靠近基坑支护一侧土体的等效应力较小,不会影响结构的安全;在重力场和列车动力荷载作用下,竖向移位时程曲线最终趋于平缓,而侧向位移时程曲线会发生振动,越靠近地铁的位置,侧向位移变化的幅度越明显.
Based on the deep foundation pit of a nearby Metro Line,the artificial dynamic excitation function is used to determine the train time-history curve.Drucker-Prager soil constitutive model is used to analyze the dynamic response of new deep foundation pit during train operation,the main conclusion are as follows:Under the action of gravity field,the maximum equivalent stress of soil and tunnel area appears in the area where the interface between the contraction area and the tunnel of the soil slope interface,and the maximum lateral displacement value appears in the area near the corner of the tunnel at the corner of the tunnel.Under the dynamic load of the train,the maximum equivalent stress of the soil and tunnel area appears in the metro wheel pressure and ground action area,and the equivalent stress of the soil near the support side of the foundation pit is small,which will not affect the safety of the structure.Under the action of gravity field and train dynamic load,the vertical displacement time history curve tends to be gentle,while the lateral displacement time history curve will vibrate.The closer to the position of the subway,the more obvious the lateral displacement change.
作者
陈煜东
CHEN Yudong(China Raliway Construction Group Co.Ltd,Beijing,100043)
出处
《长沙大学学报》
2020年第2期37-41,共5页
Journal of Changsha University
基金
中铁建设集团有限公司课题,编号LX18-31C.
关键词
深基坑
地铁
等效应力
位移
foundation pit
metro
equivalent stress
displacement
作者简介
陈煜东,男,湖南邵阳人,中铁建设集团有限公司项目经理,工程师.
