文档介绍：A Design of Shield Tunnel Lining
Part One: Design Data
Function of Tunnel
The planned tunnel is to be used as a subwa 于)=
h = Bi[1" C/(Bi，)][1 - exp(- H tan6)]+P exp(- H tan6)
0 tan 6 B1 0 B1
[1 - 0] ,
[1 一 exp(- tan 31°)] + x exp(- tan 31°)
tan31°
= > H =
So the designed tunnel is a shallow tunnel.
Load Types and Partial Factors
Table 1 shows the loads should be considered in the design and corresponding partial factors.
Table 1 Load Ty
pes and Partial Factors
Load types
Partial factors
Load types
Partial factors
Surcharge

Earth pressure

Dead load

Subgrade reaction

Water pressure

Computation of Loads
Computation element is a meter (width of segment) part along the longitudinal direction, and Figure 3 shows the load condition to compute member forces of the segmental lining.
Figure 3 Load condition of the designed tunnel
Vertical pressure at tunnel crown
Earth pressure:
p 1 = b(+ 'H) = ( + ) =
Water pressure:
p 1 = H = x x 10 x = / m
q1 = p + p 1 = + = / m
q2 = x Ry = x x 18 = / m
p1 = q1+ 勾= + = / m
Vertical pressure at tunnel bottom
p2 = p1 + t = + x 26x = / m
Where Y =Unit weight of RC segment=26kN/m2
Lateral pressure at tunnel crown
Earth pressure:
. t
q 1 =X (p 1 + 乌)= x ( + x x 8 x 粉)= / m
Water pressure:
t
q 1 = (H + ；) = x x 10 x ( +亍)= / m
p3 = q 1 + q 1 = + = / m
Lateral pressure at tunnel bottom
P4 = (M'D +y D ) = (+) =
p+ 4 = P3 + P4 = + = / m
Where
Dj=Computational diameter=D0 — t = — =
Average self-weight
p5 = t = x 26x = / m
Later