CN105808934A - Method for determining earth surface damage range and disturbance numbers under multi-coal seam mining - Google Patents

Abstract

The invention relates to a method for determining an earth surface damage range and disturbance numbers under multi-coal seam mining, and belongs to the field of mining techniques, land utilization and land reclamation. The method comprises the following steps: carrying out earth surface subsidence range simulation and prediction in coal seams by utilizing a probability integral method according to an underground coal inherent condition; determining a final earth surface subsidence range under multi-coal seam repeated mining according to a coal seam mining plan; dividing different earth surface disturbance areas for the multi-coal seam repeated mining; determining the disturbance numbers of the different disturbance areas. According to the method, the earth surface subsidence range caused by the mining of the coal seams and the repeated influences, on the earth surface, caused by the multi-coal seam mining are comprehensively considered, so that the earth surface damage range and the disturbance numbers under the multi-coal seam mining are determined; the method is simple, easy to understand and convenient to apply practically, and provides basic information for the follow-up land reclamation work of subsidence lands after the multi-coal seam mining.

Description

Earth's surface damage range and disturbance number of times defining method under mutil-coal seam mining

Technical field

The invention belongs to mining technique, Land_use change and land reclamation technical field, particularly to the defining method of the lower earth's surface damage range of multiple seam mining area repeated mining impact and disturbance number of times.

Background technology

Coal resources in China rich reserves, explored coal resources reserves are up to 1.48 trillion tons.Wherein, coal seam, some areas number of plies is many, accumulation minable thickness is big, for instance Huainan Mining Area, Anhui Province minable coal seam 9-18 layer, accumulation minable thickness reaches 25-34m；The mining area minable coal seam major parts such as Yanzhou, Shandong Province, Jining are at 7-10 layer, and minable coal seam gross thickness is about 8-12m；Site in Xuzhou Mining Area, Jiangsu Province Main workable coal seams 9 layers, accumulation is adopted thickness and is reached 15m.It is known that, China is coal production big country, show according to " national economy and social development statistical communique in 2014 " data, within 2014, annual China raw coal output is 38.7 hundred million tons, wherein the coal production of more than 90% comes from underground mine, and mostly adopt and move towards longwall all across the method management top board that falls, thus defining numerous subsidence land in coal mining area, according to related data, to the end of the year 2012, the land area of China's depression because of coal mining is about 1,560,000 hectares, and coal mine subsidence land work of reclaiming is extremely urgent.

Along with the increase of constantly exploitation and the mining depth of coal, mutil-coal seam mining is more general.Compared with exploiting with single coal bed, mutil-coal seam mining subsidence has a lot of complicated feature, under mutil-coal seam mining, owing to each ocurrence of coal seam situation is different, therefore the subsidence scope that different coal exploitation causes also is not quite similar, earth's surface zones of different is affected number of times difference by coal mining simultaneously, causes that earth's surface damage situation is complicated and changeable, is unfavorable for the carrying out that follow-up land reclamation works.Therefore, for mutil-coal seam mining, it is necessary first to the final damage range in delineation earth's surface, it is determined that zones of different is subject to disturbance number of times, region of could reclaiming needed for determining in advance, the impact of follow-up Seam Mining is better accounted for, thus the Reclamation Engineering of reasonable arrangement zones of different.

The ground damage etc. exploited currently for single work surface or single coal bed has had a large amount of deep exploration and research, and achieves great successes.But the research for the final damage range in mutil-coal seam mining earth's surface and disturbance number of times is less, under multiple seam repeated mining, how to determine the earth's surface seat of settlement, and zones of different is by disturbance number of times, thus the selection for the determination of follow-up scope of reclaiming and Secondary Reclamation Time provides Back ground Information, to mutil-coal seam mining depression reclaim most important.

Summary of the invention

It is an object of the invention to as solving an above-mentioned difficult problem, the defining method of earth's surface damage range and disturbance number of times under mutil-coal seam mining is proposed, by land subsidence scope under sunykatuib analysis mutil-coal seam mining, affect in combination with repeated mining, determine the final damage range in earth's surface and disturbance number of times, thus providing Back ground Information for follow-up mutil-coal seam mining land reclamation work.

Earth's surface damage range and disturbance number of times defining method under the mutil-coal seam mining that the present invention proposes, the method is primarily adapted for use in mutil-coal seam mining mining area, including according to underground coal occurrence condition, utilize probability integration process, point coal seam carries out the analog prediction of subsidence scope, then according to seam mining plan, it is determined that the final Subsidence Range in earth's surface under multiple seam repeated mining, multiple seam is repeated exploitation simultaneously and divides different surface disturbance regions, and determine that zones of different is subject to the number of times of disturbance.

The method specifically includes following steps:

1) according to underground coal occurrence condition, utilize probability integration process, point coal seam carries out subsidence scope simulation expectation: set production zone n coal seam altogether, and mining sequence is coal seam 1, coal seam 2 ..., coal seam i ..., coal seam n, i exploitation in coal seam causes arbitrfary point, ground (x to utilize probability integration process to estimate respectively, y) sinking, as shown in expression formula (1), then sinking be 10mm some delineation contour be coal seam i exploitation seat of settlement D_i, i=1,2,3 ..., i ... n.

$W_i\left(x,y\right)=q_i{m}_i{\mathrm{cos\α}}_i\underset{S_i}{\∫\∫}\frac{1}{{r_i}^2}{e}^{\mathrm{\π}\frac{{\left(\mathrm{\η}-x\right)}^2+{\left(\mathrm{\ϵ}-y\right)}^2}{{r_i}^2}}d\mathrm{\η}d\mathrm{\ϵ}---\left(1\right)$

In formula (1): W_i(x y) causes arbitrfary point, ground (x, sinking y), unit mm for coal seam i exploitation；

q_iSubsidence factor for coal seam i exploitation；The coal that mi is coal seam i is thick, unit mm；

α_iFor the seam inclination of coal seam i, unit °；S_iProduction zone for coal seam i；

r_iFor the major effect radius of coal seam i, unit m；I=1,2,3 ..., i ... n；

2) according to seam mining plan, determine the final Subsidence Range in earth's surface under multiple seam repeated mining: according to seam mining plan, with step 1) in point coal seam subsidence coverage, the final seat of settlement in earth's surface under multiple seam repeated mining is drawn by space overlapping, after then m seam mining terminates, the final Subsidence Range R in earth's surface_mAs shown in expression formula (2):

$R_m=\underset{j=1}{\overset{m}{\∪}}{D}_j---\left(2\right)$

In formula (1): m=1,2,3 ..., m ... n；J=1,2,3 ..., j ... m；

3) multiple seam is repeated exploitation and divide different surface disturbance regions: according to mutil-coal seam mining earth surface effects scope, it is determined that after m seam mining terminates, the different earth's surface disturbance region F of division_kAs shown in expression formula (3):

$F_k=\left\{\begin{array}{cc}{R}_1& (k=1)\\ R_k-R_{k-1}& \left(k=2,3,\mathrm{....},m\right)\end{array}\right.---\left(3\right)$

In formula (2): m=1,2,3 ..., m ... n；K=1,2,3 ..., k ... m；

4) determine that different earth's surfaces disturbance region is by disturbance number of times: according to mutil-coal seam mining earth surface effects feature, it is determined that after m seam mining terminates, surface disturbance region F_kNumber of times T (F by disturbance_k) as shown in expression formula (4):

T(F_K)=m+1-k (4)

In formula (3): m=1,2,3 ..., m ... n；K=1,2,3 ..., k ... m.

The present invention mainly has techniques below advantage:

The present invention is by utilizing under Using Probability Integral Method To Predicate mutil-coal seam mining, divide the subsidence scope that seam mining causes, consider multiple seam repeated mining feature simultaneously, clearly divided the earth's surface different disturbance regions by mining influence, and accurately determined the zones of different number of times by disturbance.The method is easily understood, it is simple to practical application, provides the foundation information for follow-up mutil-coal seam mining land reclamation work.

Accompanying drawing explanation

Fig. 1 is earth's surface damage range and disturbance number of times defining method flow chart under mutil-coal seam mining.

Fig. 2 be under mutil-coal seam mining earth's surface damage range and disturbance number of times schematic diagram (in figure, A-B represents original ground, Si represents working seam i (i=1,2, ..., n), curve Li represents that i exploitation in coal seam causes surface subsidence basin scope after terminating, and region Ri represents that i exploitation in coal seam terminates the final seat of settlement in rear earth's surface).

Fig. 3 is embodiment earth's surface damage range and disturbance number of times schematic diagram.

Detailed description of the invention

The defining method of earth's surface damage range and disturbance number of times under the mutil-coal seam mining that the present invention proposes, describes in detail as follows in conjunction with drawings and Examples:

The method of the present invention is primarily adapted for use in mutil-coal seam mining mining area, including according to underground coal occurrence condition, utilize probability integration process, point coal seam carries out the analog prediction of subsidence scope, then according to seam mining plan, determine the final Subsidence Range in earth's surface under multiple seam repeated mining, multiple seam is repeated exploitation simultaneously and divides different surface disturbance regions, and determine that zones of different is subject to the number of times of disturbance.

The method specifically includes following steps:

1) according to underground coal occurrence condition, utilize probability integration process, point coal seam carries out subsidence scope simulation expectation: set production zone n coal seam altogether, and mining sequence is coal seam 1, coal seam 2 ..., coal seam i ..., coal seam n, i exploitation in coal seam causes arbitrfary point, ground (x to utilize probability integration process to estimate respectively, y) sinking, as shown in expression formula (1), then sinking be 10mm some delineation contour be coal seam i exploitation seat of settlement D_i, i=1,2,3 ..., i ... n.

$W_i\left(x,y\right)=q_i{m}_i{\mathrm{cos\α}}_i\underset{S_i}{\∫\∫}\frac{1}{{r_i}^2}{e}^{\mathrm{\π}\frac{{\left(\mathrm{\η}-x\right)}^2+{\left(\mathrm{\ϵ}-y\right)}^2}{{r_i}^2}}d\mathrm{\η}d\mathrm{\ϵ}---\left(1\right)$

In formula (1): W_i(x y) causes arbitrfary point, ground (x, sinking y), unit mm for coal seam i exploitation；

q_iSubsidence factor for coal seam i exploitation；The coal that mi is coal seam i is thick, unit mm；

α_iFor the seam inclination of coal seam i, unit °；S_iProduction zone for coal seam i；

r_iFor the major effect radius of coal seam i, unit m；I=1,2,3 ..., i ... n；

2) according to seam mining plan, determine the final Subsidence Range in earth's surface under multiple seam repeated mining: according to seam mining plan, with step 1) in point coal seam subsidence coverage, the final seat of settlement in earth's surface under multiple seam repeated mining is drawn by space overlapping, after then m seam mining terminates, the final Subsidence Range R in earth's surface_mAs shown in expression formula (2):

$R_m=\underset{j=1}{\overset{m}{\∪}}{D}_j---\left(2\right)$

In formula (1): m=1,2,3 ..., m ... n；J=1,2,3 ..., j ... m；

3) multiple seam is repeated exploitation and divide different surface disturbance regions: according to mutil-coal seam mining earth surface effects scope, it is determined that after m seam mining terminates, the different earth's surface disturbance region F of division_kAs shown in expression formula (3):

$F_k=\left\{\begin{array}{cc}{R}_1& (k=1)\\ R_k-R_{k-1}& \left(k=2,3,\mathrm{....},m\right)\end{array}\right.---\left(3\right)$

In formula (2): m=1,2,3 ..., m ... n；K=1,2,3 ..., k ... m；

4) determine that different earth's surfaces disturbance region is by disturbance number of times: according to mutil-coal seam mining earth surface effects feature, it is determined that after m seam mining terminates, surface disturbance region F_kNumber of times T (F by disturbance_k) as shown in expression formula (4):

T(F_K)=m+1-k (4)

In formula (3): m=1,2,3 ..., m ... n；K=1,2,3 ..., k ... m.

Embodiment:

The present embodiment is mining area, a certain high ground-water level Plain, east, and ground even is open, mainly has four working seams in district, respectively coal seam 1, coal seam 2, coal seam 3 and coal seam 4, these four coal seams are the whole district and can adopt, and simple in construction, wherein coal seam 1 buried depth is about 620m, and average thickness is 2.0m；Coal seam 2 buried depth is about 680m, and average thickness is 2.5m；Coal seam 3 buried depth is about 730m, and average thickness is 2.0m, and coal seam 4 buried depth is about 770m, and average thickness is 3.0m.

The present embodiment determines earth's surface damage range and disturbance number of times under mutil-coal seam mining at computer software environment Imitating, and its method flow is as it is shown in figure 1, comprise the following steps:

1) according to underground coal occurrence condition, utilize probability integration process, point coal seam carries out subsidence scope simulation expectation: production zone is totally 4 coal seams, and mining sequence is coal seam 1, coal seam 2, coal seam 3, coal seam 4, utilizes probability integration process and electronic computer to obtain coal output layer 1, coal seam 2, coal seam 3, coal seam 4 and exploit respectively and cause subsidence coverage for D₁=78hm²、D₂=95hm²、D₃=113hm²、D₄=133hm²。

2) according to seam mining plan, determine the final Subsidence Range in earth's surface under multiple seam repeated mining:: according to seam mining plan, with step 1) in point coal seam subsidence coverage, the final Subsidence Range in earth's surface under multiple seam repeated mining is drawn by space overlapping, after then coal seam 1, coal seam 2, coal seam 3, coal seam 4 exploitation terminate, the final Subsidence Range in earth's surface is respectively $R_1=\underset{j=1}{\overset{1}{\∪}}{D}_j=D_1=78{\mathrm{hm}}^2,R_2=\underset{j=1}{\overset{2}{\∪}}{D}_j=D_1\∪D_2=95{\mathrm{hm}}^2,$ $R_3=\underset{j=1}{\overset{3}{\∪}}{D}_j=D_1\∪D_2\∪D_3=113{\mathrm{hm}}^2,R_4=\underset{j=1}{\overset{4}{\∪}}{D}_j=D_1\∪D_2\∪D_3\∪D_4=133{\mathrm{hm}}^2.$

3) multiple seam is repeated exploitation and divide different surface disturbance regions: according to mutil-coal seam mining earth surface effects scope, it is determined that after 4 seam minings terminate, by the region F of different disturbance number of times₁=R₁=78hm², F₂=R₂-R₁=17hm², F₃=R₃-R₂=18hm², F₄=R₄-R₃=20hm²。

4) determine that different earth's surfaces disturbance region is by disturbance number of times: according to mutil-coal seam mining earth surface effects feature, it is determined that after 4 seam minings terminate, surface disturbance region F₁、F₂、F₃、F₄Number of times respectively T (F by disturbance₁)=4+1-1=4, T (F₂)=4+1-2=3, T (F₃)=4+1-3=2, T (F₄)=4+1-4=1.This example subsidence scope and disturbance number of times are as shown in Figure 3, in figure, A-B represents original ground, S1, S2, S3, S4 represent working seam 1, coal seam 2, coal seam 3 and coal seam 4 respectively, curve L1, L2, L3, L4 represent that coal seam 1, coal seam 2, coal seam 3 and coal seam 4 exploitation cause surface subsidence basin scope after terminating, and region R1, R2, R3, R4 represent that coal seam 1, coal seam 2, coal seam 3 and coal seam 4 exploitation terminate the final seat of settlement in rear earth's surface respectively.

Claims (2)

1. earth's surface damage range and disturbance number of times defining method under a mutil-coal seam mining, it is characterized in that, the method includes: according to underground coal occurrence condition, utilize probability integration process, point coal seam carries out the analog prediction of subsidence scope, then according to seam mining plan, it is determined that the final Subsidence Range in earth's surface under multiple seam repeated mining, multiple seam is repeated exploitation simultaneously and divides different surface disturbance regions, and determine that zones of different is subject to the number of times of disturbance.

2. the method for claim 1, it is characterised in that the method specifically includes following steps:

1) according to underground coal occurrence condition, utilize probability integration process, point coal seam carries out subsidence scope simulation expectation: set production zone n coal seam altogether, and mining sequence is coal seam 1, coal seam 2 ..., coal seam i ..., coal seam n, i exploitation in coal seam causes arbitrfary point, ground (x to utilize probability integration process to estimate respectively, y) sinking, as shown in expression formula (1), then sinking be 10mm some delineation contour be coal seam i exploitation seat of settlement D_i, i=1,2,3 ..., i ... n.

$W_i(x,y)=q_i{m}_i{\mathrm{cos\α}}_i\underset{S_i}{\∫\∫}\frac{1}{{r_i}^2}{e}^{\mathrm{\π}\frac{{(\mathrm{\η}-x)}^2+{(\mathrm{\ϵ}-y)}^2}{{r_i}^2}}d\mathrm{\η}d\mathrm{\ϵ}---\left(1\right)$

In formula (1): W_i(x y) causes arbitrfary point, ground (x, sinking y), unit mm for coal seam i exploitation；

q_iSubsidence factor for coal seam i exploitation；m_iCoal for coal seam i is thick, unit mm；

α_iFor the seam inclination of coal seam i, unit °；S_iProduction zone for coal seam i；

r_iFor the major effect radius of coal seam i, unit m；I=1,2,3 ..., i ... n；

2) according to seam mining plan, determine the final Subsidence Range in earth's surface under multiple seam repeated mining: according to seam mining plan, with step 1) in point coal seam subsidence coverage, the final seat of settlement in earth's surface under multiple seam repeated mining is drawn by space overlapping, after then m seam mining terminates, the final Subsidence Range R in earth's surface_mAs shown in expression formula (2):

$R_m=\underset{j=1}{\overset{m}{\∪}}{D}_j---\left(2\right)$

In formula (1): m=1,2,3 ..., m ... n；J=1,2,3 ..., j ... m；

3) multiple seam is repeated exploitation and divide different surface disturbance regions: according to mutil-coal seam mining earth surface effects scope, it is determined that after m seam mining terminates, the different earth's surface disturbance region F of division_kAs shown in expression formula (3):

$F_k=\left\{\begin{array}{cc}{R}_1& (k=1)\\ R_k-R_{k-1}& (k=2,3,\mathrm{....},m)\end{array}\right.---\left(3\right)$

In formula (2): m=1,2,3 ..., m ... n；K=1,2,3 ..., k ... m；

4) determine that different earth's surfaces disturbance region is by disturbance number of times: according to mutil-coal seam mining earth surface effects feature, it is determined that after m seam mining terminates, surface disturbance region F_kNumber of times T (F by disturbance_k) as shown in expression formula (4):

T(F_K)=m+1-k (4)

In formula (3): m=1,2,3 ..., m ... n；K=1,2,3 ..., k ... m.