Method for pit protection against underground water inflow

FIELD: 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 from pit bottom; performing explosions in wells surrounding kimberlite pipe perimeter and carrying-out hydraulic fracturing from wells drilled from pit bottom to create jointed subvertical 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 about contained in underground water and rainwater.

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 and including coming from precipitation in the planned development of the field of waters, namely, that the Buryats injection wells around the perimeter of the Kimberley and the bottom of the quarry explosions in wells along the perimeter of the kimberlite pipes and the hydraulic fracturing of wells drilled from the bottom of the quarry, create the stacked sub-vertical and sub-horizontal zones of high rocks fracture, homogeneous according to this feature, serves them under pressure grouting materials and create abutting a continuous waterproof grout, forming a single whole in the form of a Cup.

Introduced in the formula of the invention, a significant feature that previously around the perimeter of the quarry are drilling injection wells, which allows subsequent explosions in them to create sub-vertical annular zone of high rocks fracture, homogeneous on this topic.

Introduced in the formula of the invention, a significant feature that previously with the bottom of the quarry are drilling injection wells, which allows subsequent fractures of them who create the subhorizontal zone rocks high fracture, homogeneous on this topic.

Introduced in the formula of the invention, a significant feature that is created by the explosions and the hydraulic fracturing zone rocks high fracture through 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.

The method is as follows. Around the perimeter of the Kimberley on a regular network with the bottom of the quarry are drilling the injection well to the target depth, explosions in the first and hydraulic fracturing secondly create a sub-vertical and sub-horizontal zones of high rocks fracture, homogeneous according to this feature, mating and hydraulically connected. Further, through injection wells they serve 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, which contributes to a better filling of the pore space. RAS is a being between wells along the perimeter of the Kimberley is chosen such to explosions in two neighboring wells between them created a homogeneous zone of fractured rocks. To create a uniform degree of subhorizontal fracture zone rocks may be running a series of hydraulic fractures, the introduction to this area of liquid explosives and blast them. 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.

The advantage of the proposed method enables the fast in the creation of a reliable cut-off wall in the form of glass, isolating working part of the mine from groundwater inflow.

Sources of information

1. Mountain encyclopedia, volume 1. - M.: Publishing House. "Soviet encyclopedia", 1984. 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 and including coming from precipitation in the planned development of the field water, characterized in that the Buryats injection wells around the perimeter of the Kimberley and the bottom of the quarry explosions in wells along the perimeter of the kimberlite pipes and the hydraulic fracturing of wells drilled from the bottom of the quarry, create the stacked sub-vertical and sub-horizontal zones of high rocks fracture, homogeneous according to this feature, serves them under pressure grouting materials and create coupling a continuous waterproof grout, forming a single whole in the form of a Cup.



 

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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.

FIELD: mining industry.

SUBSTANCE: backfill fibrosolution consists of concrete, argil, fibers and water, as fibers solution contains synthetic filaments with diameter 0,1-0,15 mm and length 10-20 mm in amount of 10-20 kg for 1m3 of argil-cement mixture, subjected to electrification with induction of static electric charge.

EFFECT: possible backfill of extensive fractured systems with active influx of water, increased hardness of backfill material, decreased material costs of reinforcement of fractured rocks, removal of water influxes in mines.

2 ex

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EFFECT: enhanced reliability.

5 cl, 2 dwg, 3 tbl

FIELD: mining industry, particularly elimination of emergency situations.

SUBSTANCE: method involves closing borehole cross-section with extendable means; arranging predetermined volume of non-combustible material above the means, wherein the volume is determined from a given relation; discharging all non-combustible material in the borehole at a time and further distributing portions of non-combustible material having volumes of not less than volume of incoming water. Non-combustible material includes clay and pourable components which are laid in layers above the means, wherein clay volume is equal to pore volume of pourable component.

EFFECT: increased reliability of borehole sealing and water burst liquidation.

3 dwg, 1 ex

FIELD: mining industry, particularly to protect mine workings against underground water ingress.

SUBSTANCE: method involves drilling injection wells along pit shaft perimeter; widening cracks by supplying high-pressure water and injecting grouting mortar in the cracks; additionally boring vertical preparation well in pit shaft center. Cracks are widened by feeding water and then air or only water in vertical preparation well. Water and air are supplied under pressure lesser than pressure of hydraulic rock fracturing. Grouting mortar is injected in cracks by forcing thereof through injection wells immediately after finishing of feeding water or air in vertical preparation well. Cryogenic gel is used as the grouting mortar. Cryogenic gel is foamed before injecting thereof in wells and foamed cryogenic gel is forced into cracks beyond the pit shaft perimeter by supplying compressed air in vertical preparation well. After leaving pit shaft as it is for grouting mortar setting time wells are sunk for the next grouting step depth and above operations are repeated up to reaching the lower boundary of pit shaft interval, wherein injection is performed under pressure exceeding that on previous step.

EFFECT: reduced labor inputs and material consumption along with increased efficiency of water suppression.

3 cl, 3 dwg, 1 ex

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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.

FIELD: mining, particularly to perform stripping and mining in pits with 6-8 crushing index.

SUBSTANCE: method involves filling previously created trench with rock loosened with milling machine, wherein loosened rock is poured in the trench from which said rock had been excavated. In the case of conveyer deactivation device usage rock is left in open trench just after rock cutting with milling means. After that rock is scooped with scrapers following pit machine without pit machine stopping.

EFFECT: increased open-pit work efficiency due to decreased milling machine downtime during rock mining.

2 cl, 1 ex, 4 dwg

FIELD: open-cast mining, particularly for mineral mining in the case of vertical ore body confined in plane view, particularly kimberlite pipes.

SUBSTANCE: method involves spacing common pit edges at intermediate stage along with new edges creation, wherein the new edges are formed of triple ledges with stability provision parameters so that the ledges are separated one from another with safety berms; creating transport descent for double-path large dump truck movement; creating U-turn platform and annular transport descends at finishing stage, wherein annular transport descends provide opposite single-path dump truck movement and are joined one to another at U-turn platform; constructing pit edges in superhigh ledges in steep ore body pitch areas; transporting ore to plant and conveying gob to extreme refuse heaps. At pit finishing stage U-turn plate forming is accompanied by transfer platform creation. Steeply inclined descent and U-turn platform are created below transfer platform along rock pillar between pits. The descent is created through the full pillar depth. Ore bodies are alternately cut with steeply inclined end descents having thicknesses providing double-path crawler dump movement. Ore and gob of the first pit are transported to transfer platform. Then ore is loaded in dump trucks. Gob is piled on the second pit edge. After total the first pit excavation gob of the first and the second pits is arranged in the worked-out space of the first pit. Inclined galleries are cut along rock pillar base to provide drain water passage from the first pit into another one.

EFFECT: increased efficiency and mineral mining completeness.

1 ex, 1 tbl, 4 dwg

FIELD: mining, particularly excavation of hard rock in confined environment demanding prevention of blasted rock cuttings falling under high ledge slopes, namely during re-activation of temporarily unworked edges of deep pits, spacing sides of deep rock excavations in road building and so on.

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EFFECT: prevention of rock fragment dispersion under high ledge slopes during blasting works performing and rock excavation.

2 dwg

FIELD: mining, particularly open cast kimberlite pipe mining.

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EFFECT: simplified method and rig and decreased power inputs for kimberlite pipe development.

2 cl, 2 dwg

FIELD: mining, particularly for underground mining of steeply-dipping and inclined ore bodies having low and high thickness, as well as streaks.

SUBSTANCE: method involves separating stages and substeps in pit side slope; constructing deep pit with steeply-dipping side slopes in hanging and lying ore deposit walls, wherein side slope direction vary up to vertical direction at final stage; cutting zones in upper horizons and constructing the first continuous transportation path made as conveyer lifting means in trenches as pit is excavated; moving upper conveyer lifting means to new pit side point of upper stage when shifting to other mining stages at central and deep horizons and constructing conveyer system in trench located in central horizon; mounting conveyer lifting means at vertical side slope reinforced with polymers, bolts and mesh along with deep horizon excavation so that curvature of formed stable side sections correspond to surface and path of continuous ore and capping rock transportation from lower horizons to upper ones, wherein increasing shear loads in material to be transported are accommodated in conveyer structure by control of pull system and pressing means of tape drive mechanism. Device for said method realization is also disclosed.

EFFECT: increased operational efficiency, decreased costs of ore and capping rock delivery from deep pit.

2 cl, 1 ex, 10 dwg

FIELD: mining, particularly to create high dumps during open pit mineral mining.

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EFFECT: increased dumping efficiency.

1 ex, 5 dwg

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EFFECT: increased efficiency and safety of aggressive brine-saturated rock dump stacking and storage.

1 ex, 2 tbl, 5 dwg

FIELD: mining, particularly opened development of horizontal and gently sloping mineral deposits.

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7 cl, 2 dwg

FIELD: mining industry, possible use during open combined excavation of bed deposits with two coal formations with alternating extraction of formations and parting and technology of stripping operations based on transporting and non-transporting excavation system.

SUBSTANCE: in accordance to invention, at predetermined sections usable for processing parting in accordance to transport-less dragline technology, special dumping vessels are created and moved for required value towards excavated space, meant later for excavation of parting rocks into them. Volumes and amount of these vessels is determined depending on mining conditions and parameters of stripping equipment. Therefore, a part of volumes of transport stripping is redistributed to non-transport stripping.

EFFECT: lower costs of stripping operations and less harmful blowouts into atmosphere from vehicle transport.

1 ex, 1 tbl, 1 dwg

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.

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