摘要
以西安地区地裂缝环境为研究背景,通过几何缩尺比例为1∶15的物理模型试验得到上、下盘相对错动情况下结构周边围岩土压力及结构应力、变形规律和宏观破坏现象,论述地下综合管廊45°斜穿地裂缝时的变形破坏模式。结果表明:随着错动量的不断增大,上盘中管廊结构顶部纵向与土体的接触压力明显增加,下盘中明显减小;至于结构顶部横向与土体的接触压力,地裂缝与结构轴线相交处土压力较大,两边土压力较小;混凝土表面纵向裂缝主要分布在下盘区2.9D^5.1D(D=0.277 m)范围内,环向裂缝主要分布于下盘区0.9D范围内,下盘结构变形程度高于上盘结构;地下综合管廊在45°斜穿地裂缝时其变形不对称,结构处于扭转、弯曲、剪切的复杂应力状态,结构的受力形式属于薄壁杆件约束扭转。研究结果可为西安地下综合管廊斜穿地裂缝时的结构设计和防治措施的制定提供一定参考。
Taking the ground fissure sites in Xi’an area as the research background,indoor physical model tests of an underground utility tunnel crossing ground fissures at an angle of 45°were performed with a geometrical reduction ratio of 1:15. The pressure of the peripheral soil and the surface strain,convergence displacement and macroscopic failure of the utility tunnel under the relative movement between the hanging and foot walls were analyzed,and the deformation and failure mode of the utility tunnel were introduced. The results indicate that the longitudinal contact pressure between the soil and the top face of the structure significantly increases in the hanging wall while decreases in the foot wall as the relative movement develops,and that the lateral contact pressure in the intersectant range between the ground fissure and the structural axis is relative larger. The longitudinal and ring cracks in the structure surface distribute respectively in the ranges of 2.9 D–5.1 D(D = 0.277 m) and 0.9 D in the foot wall. The deformation of the utility tunnel is asymmetric and the deformation in the hanging wall is higher than that in the foot wall. The structure is in a complex stress state of torsion, bend and shear,and hence,can be considered as a thin-walled member. The research can provide some references for the structural design and the formulation prevention of underground utility tunnels in Xi’an city.
作者
胡志平
张丹
张亚国
王少卿
李芳涛
HU Zhiping;ZHANG Dan;ZHANG Yaguo;WANG Shaoqing;LI Fangtao(School of Civil Engineerings Chang'an University,Xi'an,Shaanxi 710061,China;Institute of Underground Structure and Engineerings Chang'an University,Xi'an,Shaanxi 710061,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第12期2550-2560,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
陕西省重点研发计划项目(2017ZDXM-SF–095)
陕西省住房城乡建设科技科研开发项目(2016–K72)
国家自然科学基金(41877285)~~
关键词
隧道工程
地下综合管廊
地裂缝
模型试验
变形破坏模式
tunneling engineering
underground utility tunnel
ground fissure
model test
deformation failure mode
