摘要
基于某黄土隧道三台阶七步开挖法三维数值分析,提出黄土隧道开挖对地表横向最大影响范围约为3倍洞径,其中1倍洞径范围内影响较大,纵向最大影响范围约为2倍洞径,其中1倍洞径范围内影响较大,可对在此范围内的地表建筑拆除及加固;指出大管棚对控制地表变形有重要作用,明确了大管棚对地表变形影响作用在总变形量的20%以上;最后,将数值计算结果与工程实施后量测数据对比,侧证了计算结果的正确性,并找出两者差距的具体原因及应对措施.
Based on a three-dimensional numerical analysis of loess tunnel three-bench and sevenstep excavation method,it is put forward that the largest impact range of loess tunnel excavation on surface transverse is about 3times of tunnel diameter,wherein the impact is larger within the range of 1time of tunnel diameter;the largest vertical impact range is about 2times of tunnel diameter,wherein the impact is larger within the range of 1time of tunnel diameter,and demolition and reinforcement on surface buildings can be performed in this range.It is also pointed out that the advanced pipe shed plays an important role in the control of surface deformation and the influence of advanced pipe on surface deformation is defined more than 20% of the total deformation.Finally,the numerical calculation is compared with the measurement data based on the project implementation,the correctness of the calculation result is verified and the specific reasons of difference and corresponding solutions are found out.
出处
《兰州交通大学学报》
CAS
2015年第3期5-9,共5页
Journal of Lanzhou Jiaotong University
关键词
黄土铁路隧道
沉降变形
数值模拟
超前大管棚
变形控制
loess railway tunnel
settlement deformation
numerical simulation
advanced pipe shed
deformation control
