Method to erect underground mine with shield tunnelling

FIELD: mining.

SUBSTANCE: method to erect an underground mine with shield tunnelling using elements of an assembled circular lining of a support consists in mining soil with a mechanised shield. Plugging of the space behind the lining is carried out via holes in elements of a tubing support with a grouting mortar. At the initial stage of tunnelling a bottomhole is mined, and a part of the space behind the lining is filled at the length of 0.25-0.75 of the length of the element of the assembled circular lining of the support behind the first ring after the shield in the lining of the tubing support with a long-setting grouting mortar. The next stage of mining at the length of 0.5-1 of the length of the element of the assembled circular lining of the support is carried out with supply of the grouting mortar into the space behind the lining with a setting accelerator. At the stage of process shutdown of a shield for assembly of the next ring of the tubing support, the pressure of the grouting mortar in the space behind the lining behind the first ring after the shield for lining of the tubing support is maintained by means of the long-setting grouting mortar into the area of the section of the space behind the lining, initially filled with the long-setting grouting mortar. Further stages of soil mining and plugging of the space behind the lining are repeated.

EFFECT: higher efficiency and improved manufacturability of performed works, reduced labour intensiveness of overcoming emergency situations that occur in process of tunnelling.

4 cl

 

The invention relates to mining and underground construction, in particular to a shield tunneling for various purposes using the elements of the team's ring of reinforced concrete, cast iron or any other material lining.

There is a method of construction of tunnels and reservoirs using a mechanized shield, in which the bridging zaoblachnogo space is produced through the tail end portion of the enclosure directly following its progress, and as backfill use elastic material, for example, on the basis of polystyrene or polyurethane resins (see RF patent №2259479, 2004).

The specified method of construction of tunnels is material-intensive and requires the use of expensive materials.

The closest in technical essence and the achieved result for the proposed method is the method of construction of tunnels, sewers using a mechanized shield and prefabricated annular lining, including the development of a ground working body, backfill zaoblachnogo space cement slurry with the accelerator setting through the holes in the elements of the team's ring of the lining described in U.S. patent No. 5645375, published. 1997-07-08.

The disadvantage of this known method is the inability to fast-track passes the ku using quick-setting cement slurry because of the danger of hardening cement slurry when it stops sinking and the termination of supply of cement slurry with the accelerator setting. For this reason, the method is mainly used in limited circumstances when the plug sustainable loose rocks with large cavities and the wood thrown.

The present invention is directed to the solution of the technical problem consisting in the creation of a method of tunneling using cement mortar rapid setting and at the same time with the possibility of drilling in complicated hydrogeological conditions, the technological stops for mounting the elements of the ring lining, or for liquidation of emergency situations.

The technical result of the present invention is to increase productivity and improve the manufacturability of work produced by tunneling, as well as reducing the complexity of overcoming emergency situations arising from sinking.

The technical problem is solved due to the fact that the method of construction of the underground mine during shield tunnelling using elements of the team's ring of the lining, including the development of soil mechanized shield and backfill zaoblachnogo space through the openings in the elements of the team's ring of the lining, at the initial stage of penetration produce the development of the face and the filling part zaoblachnogo space for a length of 0.25 to 0.75 of the length of the element team annular lining for the first PEFC the shield ring lining of cement mortar with a long term setting. The next stage of development for a length of 0.5-1.0 length of the element team annular lining are filing released in zaoblachnoy space of a mixture of cement slurry with the accelerator setting. At the next stage - the stage of technological stop shield for mounting the next ring lining the pressure of the cement slurry in abdelazeem space after the first shield ring lining support by filing a cement slurry with a long duration of stiffening in the area of zaoblachnogo space initially filled with this solution. Next stages of excavation and backfill zaoblachnogo space again.

When implementing the proposed method as an accelerator setting cement slurry with long-term seizure, use a solution of sodium silicate with a density of 1.3-1.45 g/cm3.

It is preferable to use a cement slurry with a long term setting in the following ratio of components (dry) wt%:

Bentonite2-8
Ash ash30-78
Cement grade CEM-1-42,5B20-68

Preparation of the cement slurry with the by adding water to produce bootverbose relationship a/T 0,5 - 0,9.

In addition, the accelerator setting is mixed with cement slurry with a long-life setting in the amount of 2.5-15% by volume.

The described method of construction of the underground mine during shield tunnelling using elements of the team's ring of the lining may be more successfully applied in complex hydrogeological conditions laid tunnel, characterized on separate plots of ground waters, as well as zones of tectonic fracturing. While the injection of cement slurry is provided by the use of two-component composition: two separately supplied components, the mixing of which is provided by the design features of the system flow and mixing through the holes in the segments of the lining rings (except locking element). The start time setting should prevent the dilution of the two-component composition under the action of hydrostatic pressure of the water behind the lining of the tunnel, to limit the flow rate of excess regulation in the presence of zones of tectonic fracturing, as well as to ensure the fixing of the lining rings in space as progress panel of the complex along the tunnel.

After preparation and installation of mechanized shield and the necessary equipment to start the development of soil. The entire cycle RA is the notes may be presented in stages as follows.

At the initial stage of penetration produce the development of the face and the filling part zaoblachnogo space between the lining and the soil 0.25-0.75 length of an element of the team's ring of the lining after the first shield ring lining of cement mortar with a long term setting. The presence of the cement slurry with a long term setting in this part of zaoblachnogo space provides reliable protection of the brush seal in the tail section of the shield from falling fast-curing two-component mortar: a mixture of cement slurry with the accelerator setting.

The next stage of development for a length of 0.5-1.0 length of the element team annular lining are filing released in zaoblachnoy space fast-curing two-component mortar: a mixture of cement slurry with the accelerator setting. While it is preferable to obtain a fast-curing two-component cement slurry to use cement slurry with long-life setting in which to enter the accelerator setting. As the accelerator setting can be used a solution of sodium silicate. At this point, the injection of fast-curing two-component cement slurry (simultaneous supply of the solution of the two components) perform, maintaining pressure to the e cement slurry with long-term bonding between the lining and the ground after the first shield ring lining.

Grouting mortar with a long term setting is used in the following ratio of components (dry) wt%:

Bentonite2-8
Ash ash30-78
Cement grade CEM-I-B20-68

Preparation of the cement slurry with the addition of water to produce bootverbose relationship a/T 0.5 and 0.9.

The accelerator setting is mixed with cement slurry with a long-life setting in the amount of 2.5-15% by volume.

In the next phase of technological stop shield for mounting the next ring of the lining. The pressure of the cement slurry in abdelazeem space after the first shield ring lining support by filing a cement slurry with a long duration of stiffening in the area of zaoblachnogo space originally filled this solution through the holes in the elements of the ring lining.

Thus, as the movement of the shield, at the initial stage of penetration through the hole in the element of the ring lining in zaoblachnoy space is pumped cement slurry with a long term setting. After osvobozhde is by following, near to shield the opening in the element, through the previous hole starts the flow of cement slurry with the accelerator setting, which continue driving to the stop shield for the installation of the next ring.

In the event of an unforeseen stop panel system to ensure pumpability components through the injection hole must be immediately disengaged the accelerator setting and continue to pump cement slurry with a long term setting up automatic shutdown associated with achievement of the set pressure. The pumping of cement slurry with a long-life setting provides the cleansing of the inner surfaces of the injector and mixer that allows taking into account the characteristics of the accelerator setting to conduct further injectiona after the resumption of movement of the shield through the same injection holes.

A specific example of the method.

When drilling inclined (escalator) tunnel used mechanized shield. The injection of cement slurry in zaoblachnoy space perform, maintaining the pressure of the cement slurry with a long term set (component "A") in the gap between the lining and the ground and locking in the development of the position of the lining rings cyclical component of the solution, t is simultaneous supply of cement slurry with a long term set (component A) and accelerator setting (component B). During installation of the next adjacent ring lining the control pressure solution in abdelazeem space supported by the component.

The peculiarity of the technology lies in the combined injection of component "A" and system components "A" + "B". The component "A" is a cement slurry with a long-life setting, stable mobility and ability to act in pumps and fed them through pipelines without stratification and education "tubes"; a mixture of components "A" + "B" is a fast-curing; the component "B" accelerator setting mortars based on cement.

Each block lining width 1000 mm four holes for the supply of cement mortar for the lining (except for the locking element).

As the movement of the shield in the initial phase of drilling at site 300 mm through the hole in the block in zaoblachnoy space is blown component "A". Once released the following near the shield hole in the block, through the previous (second from shield) hole starts the supply of the mixture of components "A"+"B", which continue to be the driving another 700 mm to stop the shield for the installation of the next ring.

During the Assembly of the ring to maintain the pressure in abdelazeem space injector reconnected released in the first hole during the shield and pin the ol pressure produced by the component "A". After Assembly of the ring lining the shield continues to move, and all the operations are repeated in the same sequence.

Such a technological solution provides padding for brushes shield low viscosity cement slurry with a long duration of stiffening component "A" and updated in the drilling process to avoid "privacyware" brushes in the premature stiffening of the quick-setting cement slurry, as well as fixation of the tunnel in space in the shortest possible time with a mixture of components "A" + "B".

The hardening period of the component "A" and system components "A"+"B" are chosen based on the speed of penetration panel complex and transportation techniques developed breed (Zachodni 100 mm and transportation and unloading skip about 15 min) and amounted to 40-50 minutes

For emergency stop panel of the complex, to ensure pumpability of the components "A"+"B" through the injection hole must be disengaged component "B" and continue to pump component "And" automatic shutdown associated with achievement of the set pressure. The pumping component "A" provides the cleansing of the inner surfaces of the injector and mixer that allows taking into account the characteristics of the accelerator setting component "B" weight and further injectiona after the resumption of movement of the shield through the same injection holes. The use of component B in a ratio of component "A" 1:20 provides the possibility of further pumping components through the same injection holes to 40 minutes. Before injection of the two-component composition (component "A" + "B") for the lining efficient operation and cleanliness of the inner surface of the injectors is provided when the power supply of the component "A" for 30 seconds before switching on the supply component "B". The completion of the discharge process for the lining is the primary shutoff of component "B" and after 60 seconds - component "A". When you stop for longer than 40 minutes you need to swap the injectors in other technological holes located on the perimeter of the ring lining closer to the tail panel and to enable the supply of component "A" only after the resumption of drilling.

Specific consumption of materials in the preparation of 400 litres of cement slurry with a long term set (component "A"):

The amount of water220,00±1l
Mass of bentonite (1 bag)of 21.50±0,1kg
The mass of fly ash218,50±1 kg
The weight of cement160,00±1kg

1. The method of construction of the underground mine during shield tunnelling using elements of team annular lining lining, including the development of soil mechanized shield, backfill zaoblachnogo space through the openings in the elements of the team's ring of the lining of cement slurry, characterized in that at the initial stage of penetration produce the development of the face and the filling part zaoblachnogo space on the length of 0.25-0.75 length of an element of the team's ring of the lining after the first shield ring lining cement slurry with a long-life setting, the next stage of development for a length of 0.5 to 1 length element of the team's ring of the lining are filing in zaoblachnoy space of a mixture of cement slurry with the accelerator setting, and following this, at the stage of technological stop shield for mounting the next ring lining the pressure of the cement slurry in abdelazeem space after the first shield ring lining support by filing a cement slurry with a long duration of stiffening in the area of zaoblachnogo space initially filled with cement slurry with a long-life setting, and the next stages of development Grun the a and plug zaoblachnogo space again.

2. The method of construction of tunnels according to claim 1, characterized in that the transition to the injection of cement slurry with the accelerator setting after the primary injection of cement slurry with a long term setting start after from under the brushes panel of the complex is released following the injection hole.

3. The method of construction of tunnels according to claim 1, characterized in that as the accelerator setting in cement mortar with a long term setting is injected sodium silicate.

4. The method of construction of tunnels according to claim 1, characterized in that the accelerator setting is mixed with cement slurry with a long-life setting in the amount of 2.5-15% by volume.



 

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