Method for ground surface protection against underflooding during underworking operation performing

FIELD: mining, particularly to prevent underflooding of ground areas to be shifted during underground mining performing.

SUBSTANCE: method involves forming contour trench-like cutoff curtain in ground; creating drainage devices inside the contour and removing water from ground movement trough. The contour trench-like cutoff curtain is arranged along predicted horizontal line of ground surface relief formed after ground subsidence and height mark thereof is higher than that of maximal ground water level in spring. Necessary throughput Q of drainage devices is set on the base of mathematical expressions.

EFFECT: increased safety of underground mineral mining.

2 dwg, 1 ex

 

The invention relates to the field of mining, and is intended to prevent flooding parts of the earth, subject to subsidence in underground mining. The invention can be advantageously used in the coal industry.

Known way to prevent flooding of the pits by open drainage pumping stations ("Handbook of drainage rock." Edited Iscancel. - M.: Nedra, 1984. - P.184-185, 278 C.). The disadvantage of this method is the impossibility of its application in fields characterized by the widespread proliferation of powerful high-performance aquifers in the alluvium, as in the case of underground mining on the earth's surface are formed reservoirs of large size and drainage required continuous operation of the pumping units.

There is also known a method of protecting the earth from surface water flooding groundwater through the use of horizontal, vertical and combined drainage of aquifers ("Handbook of drainage rock." Edited Iscancel. - M.: Nedra, 1984. - P.184-185, 278 C.). The disadvantage of this method is its complexity and the economic inefficiency of applications most widespread is of powerful high-performance aquifers in alluvial deposits as for protection from flooding of large areas of a surface mine fields require a very large number of ditches, closed horizontal drains, dewatering or water-absorbing wells, wells, etc.

There is also known a method of protection from flooding from surface and ground waters, including the development of minerals under natural flow of groundwater against the current flow first along its channel, then along its slopes upwards with the conduct of the tunnel with a slope that provides drainage of water from areas of employment (avts No. 1700242, IPC E 21 41/18, publ. 23.12.1991, BI No. 47. The way to protect the undermining of objects from flooding from surface and ground waters).

The disadvantage of this method is its low efficiency in extraction of ground water in the basin of the traffics across her path.

Closest to the present invention is a method of protection of mines and pits from tributaries, groundwater contour trench grout curtains in combination with contour drainage devices ("Handbook of drainage rock." Edited Iscancel. - M.: Nedra, 1984. - P.184-185, 278 S.).

The disadvantage of this method is inefficient use it for protection from flooding the earth's surface is, induced jobs in underground mining, in the absence of any coupling parameters contour trench cut-off wall and internal drainage device settings the future of the mould movement. The contour trench cut-off wall with internal drainage devices before the start of mining operations without such coupling leads to errors in the form, size and location of contour trenches (and, hence, to the free flow outside groundwater formed after carrying out the mining basin of the rock), as well as to errors in determining the required performance contour and drainage devices, which leads to incomplete contour drainage and flooding of the mould movement.

The invention solves the problem of increasing the efficiency of the method of protection of the earth's surface at a part-time job due to the exclusion of flooding molds traffics.

To achieve the technical result of the proposed contour trench cutoff barrier located along the projected horizontal polosatogo relief of the earth surface with a high elevation of ZTdetermined from the inequality

ZT>ZB,

where ZB- elevation higher spring groundwater level, m

the required performance contour drainage devices Q establish terms and conditions

where Vp- the volume of flood waters entering the basin of the displacement, m3;

Vg- volume contour ground water in the basin of the traffics during the flood period, m3;

VC- volume zakonchennih ground water in the basin of the traffics during the flood period through contour trench cutoff barrier, m3;

Vo- the amount of rainfall received in the basin of the traffics during the flood period, m3;

Qg- maximum contour groundwater inflow into the basin of the displacement, m3/day;

AboutC- maximum inflow of groundwater in the basin of the traffics through contour trench cutoff barrier, m3/day;

Qo- maximum inflow of rain water into the basin of the displacement, m3/day;

t - duration of the flood period, days.

The location of contour trench cut-off wall aligned with the forecast posleozhogovym relief, and the performance of internal drainage devices - with the prognostic parameters of the mould movement.

The method is illustrated graphic materials showing the forecast plan undermined the part of the earth's surface (figure 1) and the vertical section a-a of the undermined area of the earth surface figure 2).

The method is as follows. For protection from flooding of the mould movement 1 contour trench cutoff barrier 2 is placed in the ground along the projected horizontal 3 polosatogo elevation high elevation of ZTdetermined from the inequality ZT>ZBwhere ZB- elevation higher spring level 4 groundwater. The necessary performance Q contour drainage device 5 sets of conditions

where Vp- the volume of flood waters entering the basin of the traffics 1, m3;

Vg- the amount of groundwater contour 6 coming into the basin of the displacement 1 of the flood period, m3;

VC- volume zakonchennih groundwater 7 coming into the basin of the traffics 1 for the flood period through contour trench cutoff barrier 2, m3;

Vo- the amount of rainfall received in the basin of the displacement 1 of the flood period, m3;

t - duration of the flood period, day;

QG- maximum contour groundwater inflow 6, in the basin of the traffics 1, m3/day;

QC- maximum groundwater inflow 7 in the basin of the traffics 1 through contour trench cutoff barrier 2, m3/day;

Qo- maximum source of Finance for the rain water in the basin of rock, m3/day.

Ground water collected contour drainage device 5 is discharged through the tunnel (pipe) 8 outside of the mould movement 1 down the slope.

The invention is illustrated by the following example.

On mine, "Kazakhstan Karaganda coal basin due to failover layer D6formed the basin of the traffics 1, and, according to the forecast, the elevation of the earth surface here will range from 473 to +476 m elevation higher spring level 4 groundwater equal to ZB=+475 m Thus, it is possible to flood the earth surface groundwater. To prevent this, provide a contour trench cutoff barrier 2, which lie along the forecast horizon 3 polosatogo elevation high elevation of Zg=+476 m, since this mark exceeds the altitude Zin. According to the calculation in the basin of the traffics 1 may be received flood waters in volume Vp=80000 m3and, during the flood period length t=15 days contour groundwater 6 volume Vg=75000 m2, zakonchennih groundwater 7 volume VC=3600 m3and precipitation volume Vo=10000 m3. The maximum expected contour groundwater inflow 6 in the basin of the movement 1 is equal to Qg=5000 m3/the ut.

groundwater 7 through contour trench cutoff barrier 2-Q3=240 m3/day rainwater - 700 m3/day.

To collect these waters within the mould traffics provided by internal drainage ditch 5 2 m deep and productivity Q=12000 m3/day. 12000 m3/d>11240 m3/day. The diversion of these waters is through the pipe 8, the cross-section which is selected on the basis of the above performance ditches 5.

Because of this, during the flood will not occur the accumulation of water in the mulde traffics 1. 12000 m3/d >5940 m3/day, that is, and at any other time of the year the water will not accumulate. Thus, contour trench grout curtain 2 in combination with the contour drainage ditch 5 and the drainage pipe 8 eliminates flooding of the mould movement.

The advantage of the proposed method is to prevent the entry of ground water in the basin of the traffics from outside its borders (except water, filtered through a contour trench cutoff barrier due to the instability of membrane properties filler veil) due to the coupling position of a contour trench cut-off wall in plan with expected completion of the process of displacement of earth the second surface relief. Another advantage is to ensure complete removal of water from the protected area, linking performance contour drainage devices and drain pipe with the volume of incoming water and water, which are calculated by the predictive parameters of the mould traffics (area, depth and volume).

The invention is intended to be used for protection from flooding the earth's surface at mining enterprises of Russia and other countries engaged in underground mining operations.

Means of protecting the earth's surface from flooding mass, including the creation of in ground contour trench cut-off wall contour drainage and water removal from the mould displacement, characterized in that the contour trench cutoff barrier feature along the projected horizontal polosatogo relief of the earth surface with a high elevation of ZTdetermined from the inequality ZT>ZBwhere ZB- elevation higher spring groundwater levels, and the required performance contour drainage devices Q establish terms and conditions

where Vp- the volume of flood waters entering the basin of the displacement, m3;

Vg - volume contour ground water in the basin of the traffics during the flood period, m3;

VC- volume zakonchennih ground water in the basin of the traffics during the flood period through contour trench cutoff barrier, m3;

Vo- the amount of rainfall received in the basin of the traffics during the flood period, m3;

t - duration of the flood period, day;

Qg- maximum contour groundwater inflow into the basin of the displacement, m3/day;

AboutC- maximum inflow of groundwater in the basin of the traffics through contour trench cutoff barrier, m3/day;

Qo- maximum inflow of rain water into the basin of the displacement, m3/day.



 

Same patents:

FIELD: mining industry, particularly to remove water from deep pits, especially in going to underground excavation in upper part of ore body.

SUBSTANCE: system comprises main pipeline, pumping unit with pumping pipe and power supply members. The system is additionally provided with lowering-and-lifting device arranged on pit side and tightening device provided with rope. The first rope end is connected with tubular case in which submersed pumping unit is installed. Submersed end of the case has throughput orifices for liquid passage. Through orifice formed at outlet case end communicates with pumping pipe orifice, which in turn is connected with inlet end of the main pipeline through connection pipe and connection flange. Outlet end of the main pipeline is secured in the lifting-and-lowering device.

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