CN102981188A - Position determination method of open coal mine underground reservoir - Google Patents

Abstract

The invention discloses a method for determining the location of an underground reservoir in an open-pit coal mine. For the geological structure of the exploration area, select the rock samples in the exploration area with stable geological structure to measure the permeability coefficient; step ③: select the exploration area with the permeability coefficient less than or equal to the predetermined value as the candidate area, and measure the permeability between the candidate area and the next mining area. Distance; Step ④: Select the candidate area with the smallest distance to the next mining area among all candidate areas as the construction location of the open-pit coal mine underground reservoir. The present invention detects the geological structure and permeability coefficient at the bottom of the mining area of the open-pit coal mine, and screens out the location of the underground reservoir of the open-pit coal mine that has good water storage performance and is convenient for collecting underground water in the mining strata, and realizes the comprehensive grasp of the determination of the location of the underground reservoir of the open-pit coal mine, maximally Protect groundwater resources in open pit coal mines.

Description

A method for determining the location of underground reservoirs in open-pit coal mines

technical field

The invention relates to a method for determining the position of an underground water reservoir, in particular to a method for determining the position of an underground water reservoir in an open-pit coal mine.

Background technique

During the mining process of open-pit coal mines, drainage and stripping operations are required. At present, a large amount of water resources are usually pumped to the ground during the mining process of open-pit coal mines. The purification treatment is also directly discharged to the bottom, polluting the environment. Therefore, it is necessary to build underground reservoirs in open-pit coal mines to store water resources. On the one hand, the construction of underground reservoirs in open-pit coal mines can protect water resources, and on the other hand, it can prevent the water sources polluted during coal mining from being discharged. Therefore, in order to rationally use the geographical conditions of the open-pit coal mine to build an open-pit coal mine underground reservoir with good water storage performance and easy to collect groundwater from the mining stratum, it is necessary to screen the construction location of the open-pit coal mine underground reservoir before the construction of the open-pit coal mine reservoir.

Contents of the invention

Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a method for determining the location of an underground reservoir in an open-pit coal mine, which can screen out the location of an underground reservoir in an open-pit coal mine that has good water storage performance and is convenient for collecting underground water from the mining strata.

Technical purpose of the present invention is achieved through the following technical solutions:

A method for determining the location of an underground reservoir in an open-pit coal mine, comprising the following steps:

Step ①: Exploring the geological structure of the bottom area of the open-pit coal mining area, and collecting rock samples of the exploration area at the bottom of the open-pit coal mining area;

Step ②: judge the geological structure of the exploration area, and select rock samples in the exploration area with stable geological structure to measure the permeability coefficient;

Step ③: select the exploration area whose permeability coefficient is less than or equal to the predetermined value as the candidate area, and measure the distance between the candidate area and the next mining area;

Step ④: Select the candidate area with the smallest distance to the next mining area among all candidate areas as the construction location of the open-pit coal mine underground reservoir.

Further, in step ①, the survey is geophysical survey and/or borehole survey.

Further, in step ①, rock samples are collected from a position at a depth of 10 m at the bottom of the open-pit coal mining area.

Further, in step ②, the exploration area with a stable geological structure is a horizontal structure and/or an inclined structure.

Further, in step ③, the area with the permeability coefficient less than or equal to 1.0×10 ^-7 cm/s is selected as a candidate area.

Further, in step ③, the predetermined value is 1.0×10 ^-6 cm/s.

Further, in step ④, the sum of the distances from each candidate area to the next mining area and surface water is determined, and the candidate area with the smallest sum of distances is selected as the construction location of the underground reservoir of the Tianmei Mine.

Further, in step ④, measure the sum of the distances between the candidate area and the next mining area, surface water and the dump site of the current mining area, and select the candidate area with the smallest sum of distances as the construction of the open-pit coal mine underground reservoir Location.

The present invention detects the geological structure and permeability coefficient at the bottom of the mining area of the open-pit coal mine, and screens out the location of the underground reservoir of the open-pit coal mine that has good water storage performance and is convenient for collecting underground water in the mining strata, and realizes the comprehensive grasp of the determination of the location of the underground reservoir of the open-pit coal mine, maximally Protect groundwater resources in open pit coal mines.

Description of drawings

Fig. 1 is a schematic diagram of the method for determining the location of an underground reservoir in an open-pit coal mine of the present invention;

Fig. 2 is a schematic diagram of determining the location of an underground reservoir using the method for determining the location of an underground reservoir in an open-pit coal mine according to the present invention.

Detailed ways

A preferred embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1, the present invention provides a kind of method for determining the location of underground reservoir in open-pit coal mine, comprising the following steps:

Step ①: Exploring the geological structure of the bottom area of the open-pit coal mining area, and collecting rock samples of the exploration area at the bottom of the open-pit coal mining area.

As a preferred solution of the present invention, the exploration is geophysical exploration and/or borehole exploration, and the present invention preferably collects rock samples from a position at a depth of 10 m at the bottom of the open-pit coal mining area. Of course, the present invention can further combine the hydrogeological data and coal strata exploration data of the open-pit coal mining area to obtain the geological structure of the mining area.

Step ②: judge the geological structure of the exploration area, select the rock sample in the exploration area with stable geological structure to measure the permeability coefficient, the present invention can measure the permeability coefficient of the rock sample by the constant water head method test method or the variable water head test method .

As a preferred solution of the present invention, the exploration area with a stable geological structure may include horizontal structures and/or inclined structures, but may not include exploration areas with unstable geological structures such as faults, faults, and dislocations. Selecting exploration areas with stable geological structures to measure the permeability coefficient of rock samples is due to the poor anti-seepage performance of some unstable geological structures, which affects the water storage capacity of underground reservoirs built on this basis, such as the construction of groundwater at faults. The water in the reservoir will infiltrate from the fault location to the deeper underground.

Step ③: Select the exploration area whose permeability coefficient is less than or equal to the predetermined value as the candidate area, and measure the distance between the candidate area and the next mining area.

The predetermined value in the preceding steps is preferably 1.0×10 ^-6 cm/s, and the present invention selects the area with a permeability coefficient less than or equal to 1.0×10 ^-7 cm/s as an alternative area to ensure that the underground reservoir of the open-pit coal mine to be built has Better anti-seepage performance to further improve its water storage performance. If the geological structure of the exploration area is unstable or the permeability coefficient of the exploration area is greater than 1.0×10 ^-6 cm/s, the present invention can also carry out enhanced anti-seepage engineering in the bottom area of the corresponding open-pit coal mining area, such as laying an anti-seepage layer. Of course, the present invention can also select other suitable predetermined values according to actual factors such as water quality and geological conditions to ensure the anti-seepage performance of the underground reservoir.

Step ④: Select the candidate area with the smallest distance from the next mining area among all candidate areas as the construction location of the underground reservoir of the open-pit coal mine, for example, select the candidate area with the smallest distance from the edge of the next mining area. The purpose of keeping a small distance between the candidate area and the next mining area is to facilitate the transportation of water to the underground reservoir of the open-pit coal mine to reduce energy consumption and save transportation costs. Similarly, in order to comprehensively utilize surface water, the present invention can also preferably measure the sum of distances between the next mining area and surface water in the candidate area, and select the candidate area with the smallest sum of distances as the construction of the underground reservoir of Tianmei Mine Location.

More preferably, the present invention uses the gravel and gravel stripped from the current mining area to backfill the underground water reservoir of the open-pit coal mine. Therefore, in order to reduce the cost of transporting the backfill, the present invention can also determine the distance between the candidate area and the next mining area, The sum of the distances between the surface water and the dump site in the current mining area, and the candidate area with the smallest sum of distances is selected as the construction location of the underground reservoir of the Tianjin Coal Mine. Similarly, the present invention can also select a location suitable for constructing an underground water reservoir in an open-pit coal mine according to the actual environment, such as surface buildings and other factors.

As shown in Figure 2, take the site selection of an underground reservoir in an open-pit coal mine of Shenhua Group as an example for further explanation. The open-pit coal mine is divided into five mining areas: the first mining area 1, the second mining area 2, the third mining area 3, The fourth mining area 4 and the fifth mining area 5. At present, the first mining area 1 has been mined, and the mining work has been advanced to the second mining area 2. The stripping work of the second mining area 2 is currently being carried out. Therefore, in the first mining area 1 to determine the location of the underground reservoir.

Step ①: Use geophysical exploration and drilling exploration to explore the geological structure of the bottom area of the coal pit in the first mining area 1, and collect rock samples at a depth of 10m at the bottom of the exploration area.

Step ②: Analyze and judge the strata, rock formations, and structures at the bottom of the coal pit, and select rock samples from exploration areas with stable geological structures to measure the permeability coefficient. As shown in Figure 2, select coal pits with stable bottom geological structures , that is, the regions A, B, C, and D where the geological structure is horizontal or inclined are screened out.

Step ③: Measure the permeability coefficients of areas A, B, C, and D. The permeability coefficients of the exploration A, B, C, and D are all less than or equal to 1.0×10 ^-6 cm/s, which meets the requirements of the open-pit coal mine underground reservoir. Therefore, areas A, B, C, and D can be used as alternative areas.

Step ④: Select the area A with the smallest distance between areas A, B, C, D and the lower second mining area 2 as the construction location of the underground reservoir of the open-pit coal mine. As shown in Figure 2, area A is the closest to the second mining area 2, so the underground reservoir of the open-pit coal mine is built here. The underground reservoir of the open-pit coal mine determined by the above method not only facilitates the transportation of water bodies to the underground reservoir of the open-pit coal mine, but also reduces energy consumption and saves transportation costs. In addition, the sum of the distance from area A to the surface water location and the dump site is the smallest. Therefore, the establishment of an open-pit coal mine underground reservoir at A can not only make comprehensive use of the underground reservoir and ground surface, but also reduce the transportation of backfill on the dump site. Shipping costs to area A.

The above-described embodiments are only for the purpose of illustrating the present invention, rather than limiting the present invention. Those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by each claim.

Claims (8)

1. A method for determining the location of an open-pit coal mine underground reservoir, is characterized in that, comprises the steps: Step ①: Exploring the geological structure of the bottom area of the open-pit coal mining area, and collecting rock samples of the exploration area at the bottom of the open-pit coal mining area; Step ②: judge the geological structure of the exploration area, and select rock samples in the exploration area with stable geological structure to measure the permeability coefficient; Step ③: select the exploration area whose permeability coefficient is less than or equal to the predetermined value as the candidate area, and measure the distance between the candidate area and the next mining area; Step ④: Select the candidate area with the smallest distance to the next mining area among all candidate areas as the construction location of the open-pit coal mine underground reservoir. 2. The method for determining the location of an underground reservoir in an open-pit coal mine according to claim 1, characterized in that, in step ①, the survey is geophysical survey and/or borehole survey. 3. The method for determining the location of an underground reservoir in an open-pit coal mine according to claim 1, wherein in step ①, rock samples are collected from a position 10 m deep at the bottom of the open-pit coal mining area. 4. The method for determining the location of an underground reservoir in an open-pit coal mine according to claim 1, characterized in that, in step ②, the exploration area with stable geological structure is a horizontal structure and/or an inclined structure. 5. The method for determining the location of an underground reservoir in an open-pit coal mine according to claim 1, characterized in that in step ③, the area with the permeability coefficient less than or equal to 1.0×10 ^-7 cm/s is selected as the candidate area. 6. The method for determining the location of an underground water reservoir in an open-pit coal mine according to claim 1, wherein in step ③, the predetermined value is 1.0×10 ^-6 cm/s. 7. the method for determining the location of the underground water reservoir in an open-pit coal mine according to claim 1 is characterized in that, in step 4., measure the sum of the distances of each candidate area from the next mining area and surface water, and select the smallest sum of distances The candidate area is used as the location for the construction of the underground reservoir of the Tianmei Coal Mine. 8. the method for determining the position of the underground reservoir of open-pit coal mine according to claim 1, is characterized in that, step 4. in, measure described candidate area apart from the distance of the dump site of next mining area, surface water and current mining area The sum of the distances is selected as the candidate area with the smallest sum of distances as the construction location of the underground reservoir of the open-pit coal mine.

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