摘要
以广东梅河高速公路葵岗隧道采空区段为实例,通过有限差分法数值计算,研究了采空区不同大小尺寸和离隧道顶部的不同距离时对隧道施工安全性影响,建立了采空区与隧道安全性之间的关系。研究结果表明:采空区与隧道顶部距离30 m,是考虑采空区对隧道施工安全性影响的临界距离;在采空区和隧道拱部净间距为2.5 m的情况下,采空区小于1.5 m×1.5 m时,采空区对隧道施工安全性影响不大,但当采空区大于2 m×2 m时,采空区对隧道施工安全性影响很大,此时隧道拱部失去稳定;采空区的存在增加了隧道边墙位移增长幅度。
According to the coal mined-out area of Kuigang tunnel of Meihe-freeway, influence on tunnelling safety caused by mined-out area of different size and different distance from the top of the tunnel is analyzed with finite-difference program, and the relation between mined-out area and tunnel safety is established. The result shows： the critical distance that mined-out area will affect tunnelling safety is 30 meters; in the instance that mined-out area is 2.5 meters away from the top of the tunnel, mined-out area will give a little influence on tunnelling safety when the size of mined-out area is less than 1. 5 m × 1.5 m, however, it will influence tunnelling safety a lot when the size is more than 2 m ×2 m and it will make the top of the tunnel lose stability; displacement of the side wall of the tunnel will increase a lot because of mined-out area.
出处
《铁道建筑技术》
2007年第3期48-51,共4页
Railway Construction Technology
关键词
煤系地层采空区
有限差分
隧道安全
coal mined-out area
finite-difference
tunnelling safety
