Method for pit protection against underground water inflows

FIELD: mining, particularly mining and pit protection against underground water inflow in the case of open-pit kimberlite pipe and other mineral deposits development in subpermafrost horizon.

SUBSTANCE: method involves discharging water initially contained in deposit section to be developed and precipitation water from said deposit section; drilling injection wells around kimberlite pipe perimeter and performing explosions through regular system from pit bottom to create joined subvertical annular and subhorizontal rock fissured zones which have uniform fissures; supplying plugging materials therein and creating joined solid watertight diaphragms shaped as integral cups.

EFFECT: possibility to create watertight diaphragm, which protects deposit section to be developed against underground water ingress.

 

The invention relates to mining, in particular to protect the pit from the inflow of groundwater at an open development kimberlite pipes and other mineral deposits in hydrate accumulations (aquifer) the horizon.

There is a method of protection quarries in these terms, including the pumping - pumping or drainage coming into the quarry groundwater direction through a system of pipes with pumps in open waters or aquifers deep [1]. The prototype.

The disadvantages of this method are:

the need to create a complex system of drainage pipes, pumps and wells for pumping postupajusch in quarry waters in the deeper horizons of the reservoir directly under developed field or lifting water up with subsequent transport through pipes to drain surface waters, if it is possible for environmental reasons, or injection into deeper horizons of the reservoir away from the field;

the need, sometimes, to move huge volumes of water, as measured by the hundreds of thousands of cubic meters.

The technical problem is to create a continuous waterproof grout, protect the developed part of the field from tributaries, groundwater and drainage the original is on the contained groundwater.

Proposed protection method developed in hydrate accumulations horizon open way part of the kimberlite pipes or deposits of other minerals from groundwater inflow, including drainage initially contained, including that derived from precipitation in the planned development of the field of waters, namely, that the Buryats injection wells around the perimeter of the Kimberley and regular network, with the bottom of the quarry, create explosions in them sub-vertical annular and horizontal connecting zones of high rocks fracture, homogeneous on this basis, continue to serve them through the injection well plugging materials and create a continuous waterproof grout forming one in the shape of a Cup.

Introduced in the formula of the invention, a significant feature that pre perimeter of the Kimberley and regular network with the bottom of the quarry are drilling injection wells, which allows subsequent explosions in them to create costimulate sub-vertical annular and horizontal zones of high rocks fracture, homogeneous on this topic.

Introduced in the formula of the invention, a significant feature that is created by the explosions zone rocks high fracture, homogeneous on this basis, alternating with the C injection wells served under the pressure of the plugging material, allows after their solidification to obtain the stacked sub-vertical and sub-horizontal monolithic waterproof grout, forming a single whole in the form of a Cup.

The method is as follows. To create a sub-vertical part of the grout drilling of wells on the perimeter of the Kimberley, to all planned development part of it was protected from the water, and regular network, for example, at the vertices of squares or rectangles, with the bottom of the quarry drilling a well to the target depth, then blasts them create respectively subvertical and subhorizontal zone rocks high fracture, homogeneous according to this feature, mating and hydraulically connected. Next, through the same hole, if necessary, restored by re-drilling in zones of high tremenously served under the pressure of the grouting material, after hardening which form a continuous monolithic waterproof membrane veil in the form of glass, within which is a working part of the field. It is preferable to use a plugging material that is not susceptible to the ravages of aggressive groundwater and volume during solidification increases that pic is of bstweet better filling of the pore space. The distance between the holes is selected such that when the explosions in two neighboring wells between them created a homogeneous zone of fractured rocks. The degree of homogeneity of the fractured zone to the injection solution can be estimated using geophysical research, in wells, in particular consistently measuring the resistance between the electrodes in two adjacent wells, which in these circumstances will be filled with water. In areas with high resistance and, consequently, a relatively lesser degree of destruction of rocks to increase their fracture explosions should be repeated. The presence of hydraulic connection subhorizontal and subvertical zones of high rocks fracture can be set by known methods: the flow in the well at the bottom of solutions with different indicators - salts, coloring agents, radioactive isotopes and control of their receipt in wells along the perimeter of the quarry. Water originally contained in the isolated membrane veils the volume of rocks and flowing into the quarry with precipitation, are removed by known methods of drainage and/or drainage. Likewise, when developing parts of coal, bauxite in karst cavities, placer gold deposits found in aquifers, although often in the area of R is Suite permafrost limited to the development of mineral resources in the frozen state, leaving the pillar between the working part of the field and hydrate accumulations (aquifer) horizon.

The advantage of the proposed method is to create a reliable cut-off wall in the form of glass, insulating working part of the mine from groundwater inflow.

The source of information

1. Mountain encyclopedia, volume 1. - M.: Publishing House. "Soviet encyclopedia", 1984, see s.

The protection method developed in hydrate accumulations horizon open way part of the kimberlite pipes or deposits of other minerals from groundwater inflow, including drainage initially contained, including that derived from precipitation in the planned development of the field water, characterized in that the Buryats injection wells around the perimeter of the Kimberley and regular network, with the bottom of the quarry, create explosions in them sub-vertical annular and horizontal connecting zones of high rocks fracture, homogeneous on this basis, continue to serve them through the injection well plugging materials and create a continuous waterproof grout, forming one in the form of a Cup.



 

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