CN103133003B

CN103133003B - Opencut steep end-slope mining method

Info

Publication number: CN103133003B
Application number: CN201310058286.4A
Authority: CN
Inventors: 周伟; 才庆祥; 舒继森; 韩流
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2013-02-25
Filing date: 2013-02-25
Publication date: 2015-10-21
Anticipated expiration: 2033-02-25
Also published as: CN103133003A

Abstract

The invention discloses a kind of opencut steep end-slope mining method, in the process of exploiting in the open, overall side slope for stope horizontal two side ends side leans on boundary according to the stable angle [alpha] exploitation of initial designs, theoretical according to timeliness side slope, internal dumping follows up in time, shortens the minimum safe distance D needed for the end, hole distance to exploitation _min, reduce the whole height H of end wall simultaneously, according to stability of slope condition, slope angle be increased to β, realize by side exploitation.The height of internal dumping bottom pressure side step is 2 ~ 3 times of mining work side shoulder height, and the Tu Yan of stripping is transported to internal dumping bottom pressure side step by the conveyor bridge built.The present invention ensureing to improve its slope angle under the prerequisite that end side is stable, recovery end can help residual coal, reducing stripping-to-ore ratio, reducing cost of transportation.

Description

Opencut steep end-slope mining method

Technical field

The present invention relates to a kind of opencast mining method, especially a kind of be applicable to opencut end side by help exploitation method.

Background technology

Have an opencast mining of an important branch as mineral industry, carry more and more important coal mining task, its essence is and constructs space on earth's crust entity, spatially constructs the complex process of mine entity, so just defines the side slope of working pit edge, end side and correspondence.Due to the restriction of geological conditions, opencut end helps overall side slope angle less, and stripping-to-ore ratio is comparatively large, and the residual coal waste of end side is serious, and secondary overburden amount during back production also increases thereupon.End wall angle too small, cause the end side serious waste of coal resources and colliery whole economic efficiency low.

Summary of the invention

Technical problem: the object of the invention is to overcome Problems existing in prior art, provides a kind of and increases opencut end wall angle, recovery end helps residual coal, reduces stripping-to-ore ratio, reduces the opencut steep end-slope mining method that automobile haul distance improves overall efficiency.

Technical scheme: opencut steep end-slope mining method of the present invention: in the process of exploiting in the open, overall slope angle for stope horizontal two side ends side first stablizes angle [alpha] exploitation extremely by boundary according to first of exploitation initial designs, internal dumping bottom pressure side step follows up in time, shortens hole end distance d, reduce the whole height of end wall hon this basis, keep mining height constant, advance to two side ends side from end side bottom, cancel end side transport routes, slope angle is increased to second and stablizes angle beta, peel off rock mass, construct intermediate axle at Bottom of Stope, the rock mass of stripping is transported to internal dumping by the intermediate axle of constructing at the bottom of pit in the open and dumps, recovery end helps residual coal afterwards, realizes by side exploitation.

Described shortening hole end distance dminimum safe distance d _minfor 50m; The height of described internal dumping bottom pressure side step is 2 ~ 3 times of working pit edge shoulder height, and the height of working pit edge step is less than the maximum digging height of extractive equipment.

Beneficial effect: opencut steep end-slope mining method of the present invention, by improving end wall angle, reclaims residual coal, reduces stripping-to-ore ratio.Derivative on the basis of existing timeliness side slope theory, by improving slope angle, can ensure to improve its slope angle under the prerequisite that end side is stable, recovery end be helped residual coal, is reduced stripping-to-ore ratio, reduces cost of transportation.There is the advantages such as application cost is low, good economical benefit, and there is practicality widely.

Accompanying drawing explanation

Fig. 1 is that side of the present invention is by side exploitation shape and structure schematic diagram;

Fig. 2 is open pit mine field structure top view of the present invention;

Fig. 3 is that the A-A place of Fig. 2 is by side recovery profile schematic diagram;

Fig. 4 is of the present invention by the stope structure top view after side exploitation;

Fig. 5 is the B-B place stereochemical structure sectional view of Fig. 4.

In figure: 1, end side, 2, bottom pressure side step, 3, seam mining height, 4, end side road, 5, rock mass, 6, the residual coal of end side, 7, at the bottom of outdoor pit, 8, intermediate axle, 9, internal dumping, 10, working pit edge step.

Detailed description of the invention

Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:

As shown in Figure 1, Figure 2, Figure 4 shows: opencut steep end-slope mining method of the present invention, in the process of exploiting in the open, overall side slope for stope horizontal two side ends side 1 leans on boundary according to the stable angle [alpha] exploitation of initial designs, and internal dumping bottom pressure side step 2 follows up in time, shortens hole end distance d, reduce the whole height of end side 1 side slope hon this basis, constant according to seam mining height 3, advance from bottom end side 1 to two side ends side, cancel end side road 4, slope angle is increased to β, and peel off rock mass 5, recovery end helps residual coal 6, intermediate axle 8 is constructed at Bottom of Stope, the rock mass 5 peeled off is transported to internal dumping 9 by intermediate axle 8 and dumps, and recovery end helps residual coal 6 afterwards, realizes by side exploitation.

As shown in Figure 4, Figure 5: when internal dumping bottom pressure side step 2 follows up, hole end distance dreach the minimum safe distance needed for exploitation d _min, minimum safe distance d _minfor 50m, meet extractive equipment job requirements; The height of described internal dumping bottom pressure side step 2 is 2 ~ 3 times of working pit edge step 10 height; The height of described working pit edge step 10 is less than the maximum digging height of extractive equipment, is generally 10 ~ 15m.

Claims

1. an opencut steep end-slope mining method, be included in opencast process, overall slope angle for stope horizontal two side ends side (1) first stablizes angle [alpha] exploitation extremely by boundary according to first of exploitation initial designs, internal dumping bottom pressure side step (2) follows up in time, shortens hole end distance d, reduce the whole height of end side (1) side slope h, it is characterized in that: reducing the whole height of end side (1) side slope hbasis on, keep mining height (3) constant, advance from end side (1) bottom to two side ends side, cancel end side road (4), slope angle is increased to second and stablizes angle beta, peel off rock mass (5), intermediate axle (8) is constructed at Bottom of Stope, the rock mass peeled off is transported to internal dumping (9) by the intermediate axle (8) that at the bottom of pit, (7) are constructed in the open dump, by improving end wall angle, reclaims residual coal, reducing stripping-to-ore ratio; Recovery end helps residual coal (6) afterwards, realizes by side exploitation; Described shortening hole end distance dminimum safe distance d _minfor 50m; The height of described internal dumping bottom pressure side step (2) is 2 ~ 3 times of working pit edge step (10) height, and the height of working pit edge step (10) is less than the maximum digging height of extractive equipment.