摘要
为研究地铁列车振动荷载对地裂缝附近土压力动响应的影响机理,开展了地裂缝与斜交马蹄形地铁隧道的物理模型试验,分别制作地铁隧道模型和土层模型,采用激振器模拟地铁列车振动,通过压力盒测试土压力分布规律。试验结果表明:地裂缝未活动时,激振点所在的地裂缝一侧的附加土压力大于另一侧的附加土压力,离激振点越远附加土压力越小。垂直隧道方向的附加土压力分布具有隧道轴线处最大、隧道两侧逐渐减小的规律。地裂缝活动后,位于隧道上部的土体附加压力呈现上盘大、下盘小的分布规律,其余部位的附加土压力呈现下盘大、上盘小的规律。地裂缝未活动时,土体附加压力的分布主要受地裂缝的存在及与激振点距离的影响;地裂缝活动后土体附加压力的分布主要受隧道与土体接触状态的影响。
A large scale model test was carried out to study the dynamic response of the earth pressure in ground fissures area under vibration loads of train. The metro tunnel model and the layer model was built. The metro train vibration was simulated by the vibration exciters. The earth pressure was tested by the pressure cell, The test results show that the additional earth pressure on the side of the vibration exciter is bigger. The additional earth pressure reduces when acrossing the ground fissure. The additional earth pressure on the axes of tunnel is bigger than that on the side of the tunnel. When the halling wall of ground tissue descends, the additional earth pressure above the tunnel has the distributing disciplinarian of that on the side of hailing wall is bigger than that on footwall, while the distributing disciplinarian is opposite in the other area of ground fissure. The additional earth pressure becomes small when the vibration exciter moving to the halling wall from the footwall. Before the ground fissure movement, the additional earth pressure distribution is affected mainly by the ground fissure. When the halling wall descends, the additional earth pressure distribution is affected mainly by the contact state of the tunnel and the soil.
作者
刘蕾
马涛
刘雪玲
倪天翔
LIU Lei;MA Tao;LIU Xueling;NI Tianxiang(College of Resources and Safety Engineering, China University of Mining and Technology(Beijing) , Beijing 100083, China;, Geological Environmental Monitoring Central Station of Qinghai Province, Xining, Qinghai 810001, China;College of Geological Engineering and Geomatics, Chang' an University, Xi' an, Shaanxi 710054, China;China Institute of Geo-Environment Monitoring, Beifing 100081, China)
出处
《中国地质灾害与防治学报》
CSCD
2017年第4期119-124,共6页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金(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
土压力
模型试验
ground fissure
metro tunnel
train loads
earth pressure
model test