隧道支护结构体系及其协同作用
1)
张顶立,孙振宇,侯艳娟
TUNNEL SUPPORT STRUCTURE SYSTEM AND ITS SYNERGISTIC EFFECT
1)
Dingli Zhang,Zhenyu Sun,Yanjuan Hou
表2
超前小导管参数波动范围
Table 2
The range of advanced small pipe parameters
diameter d/mm
30,
35,
40,
45,
50
longitudinal space Sc/m
3,
3.5,
4,
4.5,
5
circumferential spaceSl/cm
25,
30,
35,
40,
45
length l/m
3,
3.5,
4,
4.5,
5
extrapolation angle 0/(。）
10,
15,
20,
25,
30