The dynamic response of the structure caused by the train load is mainly at the inverted arch. Therefore, monitoring points are arranged near the inverted arch, the arch springing, and the void area of the tunnel, as shown in Figure 6.
The displacement and velocity response of tunnel structure under train load is mainly vertical, and the response of the inverted arch is the most intense.
Through the analysis on vertical displacement and velocity time-history curves for the inverted arch of the tunnel, the findings are as follows.
The vertical displacement and velocity curves of the inverted arch vary obviously with the increase of void width, which shows that the void width of the base under the rail has a great effect on the displacement and velocity of the inverted arch.
The curves for relationship between the peak values of displacement and velocity of the inverted arch and the void area of the base are shown in Figures 9 and 10.
The maximum tensile stress acts on vault and inverted arch
. The compression zone of the tunnel is mainly distributed on both sides of lining.
Along the way, exciting secrets were revealed, including this rare inverted arch
foundation Codes: to170707interiors, from left, -7, -5, -13, and -11; The kitchen was designed and built for the house Code: to170707interiors-4; The Lord Mayor outside his beautifully restored home Code: to170707interiors-1; The main living room has been styled to recreate the original elegance, but the modern comforts have been chosen to carefully blend old and new Pictures: TRACY O'NEILL/ to170707interiors-9; Lord Mayor of Liverpool Cllr Paul Clark in the impressive hall Code: to170707interiors-10
where [L.sub.Z] is the width of the inclined shaft along the long-axis direction, [L.sub.Z] = 0.4 m; [L.sub.X] is the width of the roadway, [L.sub.X] = 6.33 m; [q.sub.d] is the maximum roof pressure of the inclined shaft, as shown in the Section 2, [q.sub.d] = 2.7 MPa; the width of the U-type steel is 0.15 M, so [q.sub.1] = 0.15 * [q.sub.d] = 0.15 *2.7 kN/m; [P.sub.0] is the ultimate bearing capacity of the inverted arch; and T is the vertical tension of floor bolting.
According to the above known conditions, the bearing capacity of the inverted arch can be calculated by formula (13):
Therefore, the design of the U-type steel inverted arch supplemented by bolts support is reasonable.
After numerical simulation and theoretical analysis, the supporting scheme "U-type steel + inverted arch + pouring concrete + backwall grouting" is applied in Pingdingshan Coal Mine.
(2) U-type steel inverted arch supplemented by the bolt support scheme was designed to control the floor heave of the inclined shaft.