DE4133577A1 - Method of reducing or eliminating dynamic effect on permanent lining of mine tunnel - involves installation of cushioning layer simultaneously with drainage and sealing processes - Google Patents

Abstract

A method of reducing or eliminating the dynamic effect on the permanent lining of a mine roadway or other tunnel by the installation of a cushioning or shock absorbing flat sheet. Drainage, leakage detection and sealing are carried out at the same time. The tunnel (2) is protected from shock waves (3) by rock nails or anchors (4) driven into the rock face (1) radially followed by a sprayed concrete liner (5) and the cushioning layer (6). USE/ADVANTAGE - The cushioning layer is not primarily for sealing or drainage through it may be combined with these processes.

Description

The invention relates to a method for avoiding or reducing dynamic effects on the expansion of underground cavities by installing a flexible layer (cushioning layer) between shotcrete and inner shell or directly between rock and Expansion.

Under dynamic influences in the sense of this invention Exposures from shocks and spreading from seismic and subseismic waves in the subsurface, for example from Ab construction processes in mining, detonations, explosions, earthquakes, Weapons effects etc. understood.

The invention also relates to those possible with the damping layer additional drainage, sealing, shear stress-free layer inner shell and leak detection. The intermediate layer is not primarily used for sealing or drainage, but can also be used such uses can be combined. The intermediate layer Due to its low shear strength, it also reduces adornment of loads from static influences, so that the interior shell is less stressed. If drainage effect at the same time and sealing and / or leak detection is to be achieved, so permeability can be ensured by suitable design will.

The process is suitable for closed reinforced concrete shell, but can also be used for a shell that is not closed find. The damping layer can cover the entire circumference or introduced in some areas. Depending on the calculated or assumed load can be the thickness, compliance and that plastic working capacity of the damping layer set will.

The cushioning layer can be made from foams, Filaments, nets or other compliant materials or ver coil materials.

After possibly manufacturing the shotcrete outer shell and given if smoothing the same, the damping layer can be flat be brought, by mechanical or chemical fixation (Gluing). Then the inner shell against the damping layer concreted. If prefabricated panels are used, the damping layer can also be attached to it.

The invention can also be used for static load cases around the Processing to reduce the stress on the inner shell to care.  

Fig. 1 shows an ideal cavity in cross section with the location and designations of the expansion elements.

Reference symbol list

1 rock, earth, mountains
2 cavities (tunnel, section, shaft, cavern)
3 shock wave
4 rock protection, as required (rock nails, anchors)
5 shotcrete, as required (unreinforced, reinforced, fiber shotcrete); compensation layer if necessary
6 Damping layer, if necessary, execution at the same time for drainage, sealing, leak detection
7 inner shell (not necessarily closed)
8 if necessary solid sealing, drainage etc.

Claims (4)

1. Procedure for avoiding or reducing dynamic influences to expand underground cavities by installing a shock absorbing flat liner. 2. The method according to claim 1, characterized in that the same drainage effect should be achieved early. 3. The method according to claim 1, characterized in that the same sealing should be achieved in good time. 4. The method according to claim 1, characterized in that the same leak detection is carried out in good time.