摘要
采用ABAQUS有限元软件建立马蹄形地铁隧道与地裂缝呈60°斜交的计算模型研究地铁运行引起的地裂缝附近地层的振动响应。计算结果表明:隧道附近的土体振动较强烈,距离隧道越远,土体的加速度幅值越小;振动响应较强烈的区域,沿隧道纵向约为120 m,沿竖直方向为隧道下方15 m,与隧道纵向垂直的水平方向上为隧道左右20 m范围;振动在与隧道纵向垂直的水平方向传播时,无地裂缝地带在隧道两侧均匀衰减,地裂缝地带在有地裂缝的一侧振动衰减较快,说明地裂缝对地铁振动在地层中的传播有较强的阻隔作用;地裂缝附近隧道下方土层的振动要比上部土层强烈,传至地表的振动加速度基本衰减为零。
A numerical analysis model,with an oblique crossing of 60°between horseshoe-shaped metro tunnel and ground fissure,was built with ABAQUS to study the dynamic response of the oblique metro tunnel in ground fissure area under vibration load of metro.The results show that the soil vibration near the tunnel is stronger,and the acceleration amplitude of the ground near the tunnel are greater than those far away from the tunnel.The area with strong vibration response is within 120 metres along the metro tunnel,15 metres under the tunnel in vertical direction,and 20 metres in both sides of the tunnel.Ground fissure has a strong barrier effect on the propagation of subway vibration in the soil.The vibration of the soil below the ground fissure is stronger than that of the upper soil layer,and the vibration acceleration on the ground level of the soil nearly reduces to zero.
作者
刘蕾
刘雪玲
周金喜
LIU Lei;LIU Xueling;ZHOU Jinxi(College of Resources and Safety Engineering,China University of Mining and Technology,Beijing 100083,China;College of Geological Engineering and Geomatics,Chang’an University,Xi’an 710054,Shannxi,China;No.8 Team of Geology and Mineral Resources Bureau for Non-Ferrous Metals of Qinghai Province,Xining 810012,Qinghai,China)
出处
《地质力学学报》
CSCD
2018年第2期238-243,共6页
Journal of Geomechanics
基金
国家自然科学基金项目(41172257)
青海省自然科学基金(2017-ZJ-909)
青海省应用基础研究(2014-ZJ-706)
关键词
地裂缝
地铁隧道
列车荷载
动力响应
数值分析
ground fissure
metro tunnel
train load
dynamic response
numerical analysis
