Method of horizontal radial drain hole constructing in hard rocks

FIELD: mining; construction.

SUBSTANCE: method of horizontal radial drain hole constructing in hard rocks includes vertical shaft sinking and drilling from it horizontal radial drain hole and constructing from its bottom additional vertical shaft. Using both shafts along the full length of horizontal radial drain hole it is located string camouflet charge. After charge explosion there are formed horizontal radial drain hole with area of bund fracturing and then on one side of newly formed horizontal radial drain hole there is mounted surface casing with closer and draining, and on the other - choke. On drained territory there is installed at least one hydro-supervisory well.

EFFECT: reduction of drill footage; reducing of horizontal radial drain hole breakingin terms; rising of its interception ability and ability to make an attendance for dewatering drained territory.

3 cl, 2 dwg, 1 ex

 

The invention relates to mining, construction and is intended for use in the construction of drains and drainage collectors in hard rock.

At different stages of development of built-up areas and industrial sites are used in horizontal and radial drains.

Known "Way to create drainage in the conditions of permafrost soils" (AS the USSR №1122778, publ. 1984.11.07). Along the constructed drains are drilling a series of vertical wells to a depth exceeding the capacity of permafrost soils, and form a zone of dense fracturing through camouflage explosion elongated explosive substances within the drains along the entire length of the well. The explosion on the highway constructed drains be a continuous zone of fracture.

The disadvantage of this method is the large amount of Assembly and dismantling, shipping explosives and other materials, the high cost of drilling for the construction of vertical wells, the periodic nature of the change in cross-section formed by horizontal drains across the road.

Closest to the proposed invention is a method of construction of the radial drainage, including the sinking of the vertical shaft and the drilling of the horizontal radial drainage wells. When drilling into a solid (the local or half-rocks) rocks constructed first bore, which is then drilled at the required diameter (Reference drainage rocks. Ed. Iscancel - M. Nedra, 1984, str, 417-421).

The disadvantages of this method are:

- lack of Park and ride capacity horizontal radial drainage wells, i.e. low yield of well drained site;

- drilling of horizontal radial drainage hole to the required diameter to provide the necessary drainage drained site increases the costs of drilling and extend the terms of the construction of the well.

The objective of the invention is to develop an effective and economic method of construction of the horizontal radial drainage wells in hard rock, raising its intercept capability.

To solve this problem we propose a method of building of horizontal radial drainage wells, including the sinking of the vertical shaft and the drilling of the horizontal radial drainage wells, and the bottom horizontal radial drainage wells construct additional vertical shaft, and using both the trunk, along the entire length of the horizontal radial drainage wells place corded, camouflage charge, by blasting which form a horizontal radial drainage hole area CPF who's fracture. At the mouth of the newly formed horizontal radial drainage wells set the guard with locking device and the drain, and the bottom stub. In addition, on the drained site put no less than one gidroobladnannya well.

Distinctive features of the proposed method is that:

- the bottom horizontal radial drainage wells construct additional vertical shaft, using it and the first vertical shaft, place the corded, extended the full length of the borehole, camouflage charge, thereby decreasing the period of commissioning of horizontal radial drainage wells;

- corded, extended the full length of the borehole, camouflage charge allows in a short period of time extending well and get horizontal radial drainage hole in the solid rock, at the same time to increase due to the explosion fractured rock surrounding the well, thereby to increase Park and ride capacity, and also to reduce the cost of its construction.

at the mouth of one side of the newly formed horizontal radial drainage wells, conductor with locking device and the drain, and the other stub, can reduce the duration of the commissioning of horizontal radial drainage borehole;

- install the CA on the drained site not less than one hydronavigational well allows you to monitor the drying process of this territory.

The proposed method is illustrated in the drawings, which depict:

figure 1 - the stage in the horizontal radial drainage hole and the cord that extended the full length of the borehole, camouflage charge;

figure 2 - the final phase of construction horizontal radial drainage wells in hard rock.

The claimed method of construction of the horizontal radial drainage wells in hard rock is as follows.

On the drained site 1, presents hard rock 2, plan route 3 horizontal radial drainage wells (figure 1). Track 3 can be performed as strictly horizontal and inclined up to 10° to the horizon. At the beginning of track 3 at a given depth construct a vertical shaft 4. As the vertical shaft 4, you can use existing at the beginning of track 3 natural slopes, terrain countryside, Board quarries or existing mine workings and pits. Of the vertical shaft 4 is realized by drilling 5, oriented along the 3. On the bottom 6 of the bore 5 construct additional vertical shaft 7 at the same depth as the first vertical shaft 4. Using both vertical shaft 4 and 7, the bore 5 is placed corded, extended to the entire borehole 5, camouflet charge 8. The radius of the constructed horizontal the th radial drainage wells 9 correlated with the consumption of explosives per 1 m length, determined by the formula

CCC=πR2g,

where CCC- consumption of explosives;

R is the radius of the zone of destruction and section horizontal radial drainage wells is determined based on the expected flow of groundwater.

g - specific consumption of explosives for the normal loosening rocks.

Carry out blasting camouflage charge 8, resulting in a besfiltrovye, same cross-section horizontal radial drainage hole 9. Along the formed bore 9 in the solid rock 2 cracks 10, increase Park and ride capacity groundwater (figure 2). After the explosion, carry out the necessary measures for the safety of work: air horizontal radial drainage hole and vertical trunks, assign contact with water and other On the mouth 11 of the horizontal radial drainage wells 9 installing the conductor 12 with a locking device 13 and the drain 14, and the bottom 6 of the horizontal radial drainage bore 9 of the plug 15. Horizontal radial drainage hole 9, constructed in hard rock, ready for use.

On the drained site 1) for evaluation of drainage, that is, lowering of groundwater levels, put no less than one gidroobladnannya well (not shown).

Practical applicability statement the aqueous method of construction of the horizontal radial drainage wells in hard rock shown in the following example of a specific implementation.

Example

The village is situated on the area of development of solid rocks are represented by granites, which are in the upper weathered zone. Granite everywhere covered loam capacity up to 4,0-5,5 m Granites and loam aquifer and are the coefficients of the filter, respectively, 2.8 m/day and 0.6 m/day, and General statistical groundwater level is located at a depth of 1.2-1.5 m from the surface. Track horizontal radial drainage wells are laid along the village street.

Construct a vertical shaft depth of 6,5-7,0 m From the vertical shaft are drilling horizontal radial drainage hole with a diameter of 93 mm to a depth of 300 m At the bottom of the drilled wells construct a second vertical shaft of the same depth. As explosives (he) are used corded, extended the full length of the borehole camouflage charge representing a flexible plastic hose with a diameter of 50 mm with wall thickness of 1.5-2.0 mm Charging is carried out by pulling charge from one vertical shaft in the other across the hole.

Consumption of explosives determined by the formula

CCC=πR2g,

where R is the radius of the zone of destruction, g - specific consumption of explosives for the normal loosening drained rocks.

As a result of the explosive charge received besfiltrovye, od is nakiwogo section, horizontal radial drainage hole, the radius of the zone of destruction was ≈0.35 m, the consumption of explosives equal to ≈60 kg. For organized drainage water wellhead equipped with a conductor, a shut-off device and the drain, and the bottom stub. The time structure is 12 days.

Commissioning of horizontal radial drainage wells in the village were allowed to drain strip width of 180-200 m and ensure the normal operation conditions of basements of buildings and structures.

As can be seen from the above example, the claimed combination of features allows you to significantly reduce the amount of drilling, reduce the time of commissioning of horizontal radial drainage wells, and also to increase Park and ride capacity and monitor drained drained area.

1. The method of construction of the horizontal radial drainage wells in hard rock, including the sinking of the vertical shaft and the drilling of the horizontal radial drainage wells, characterized in that the bottom horizontal radial drainage wells construct additional vertical shaft, and using both the trunk, along the entire length of the horizontal radial drainage wells place corded camouflage charge, by blasting which form a horizontal beam of the first drainage hole zone of dense fracturing.

2. The method according to claim 1, characterized in that after the explosion, on one side, the newly formed horizontal radial drainage wells, install the guard with locking device and the drain, and the other stub.

3. The method according to claim 1, characterized in that on the drained site put no less than one gidroobladnannya well.



 

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