蘭花寶欣礦中厚煤層無巷旁充填沿空留巷技術(shù)與工程實踐
發(fā)布時間：2019-02-15 16:18
【摘要】：山西古縣蘭花寶欣煤礦設(shè)計產(chǎn)量0.9Mt/a,目前主采3號煤層,平均煤厚1.77m,傾角為4~10°,埋深400m,位于山西組中部,K7粉細砂巖之上。存在工作面接續(xù)緊張、資源采出率低等問題,因此本文以蘭花寶欣礦3號煤層為工程背景,研究攻關(guān)無巷旁充填沿空留巷技術(shù),取得主要成果如下:(1)對無巷旁充填沿空留巷覆巖大結(jié)構(gòu)的演化規(guī)律及穩(wěn)定性進行了理論分析和研究。在工作面回采結(jié)束、接替工作面回采前,弧形三角塊B受下部直接頂和矸石提供的支承力、相鄰塊體的夾持作用,大結(jié)構(gòu)能夠達到平衡穩(wěn)定狀態(tài);二次采動影響期間,大結(jié)構(gòu)承受的載荷雖然不斷的增加,各塊體之間的受力狀態(tài)發(fā)生了變化,但是支承條件未改變,因此會保持隨機的平衡狀態(tài),接替工作面推過后,大結(jié)構(gòu)會徹底失穩(wěn)。(2)分析了無巷旁充填沿空留巷圍巖小結(jié)構(gòu)的組成及力學特征,是指由巷道錨桿錨索組合支護、巷內(nèi)輔助支撐和錨固作用范圍的圍巖構(gòu)成的錨固承載體系。將無巷旁充填沿空留巷頂板的前期垮落簡化為三邊或四邊支承的矩形疊加層板受彎折破壞的力學模型,給出了巷內(nèi)輔助支撐載荷分別在頂板初次垮落、周期垮落以及后期破壞活動過程中的計算公式。(3)以蘭花寶欣礦3號煤層地質(zhì)條件為依據(jù),采用3DEC離散元數(shù)值分析方法,模擬了3103工作面和3105工作面無巷旁充填沿空留巷開采過程,研究了無巷旁充填沿空留巷在兩次采動過程中的圍巖變形規(guī)律與應力變化特征。3103工作面回采時,在工作面后方10m~30m的范圍內(nèi),巷道頂板下沉最為劇烈,下沉速度為12.2mm/d~18.1mm/d,最大下沉量達到122~175mm,為煤層采厚的6%~9%;3105工作面回采時,在超前工作面10m至工作面后方25m的范圍內(nèi),巷道頂板急劇下沉,在巷道報廢前,下沉速度達到35.5mm/d~41.1mm/d,頂板最大下沉量達到350~435mm,為煤層采厚的17%~22%。3105工作面回采過程中,靠近3103采空區(qū)部分的采場頂板首先形成弧三角形垮落,然后向O型垮落發(fā)展。因此,推斷在當前的地質(zhì)條件,無巷旁充填沿空留巷采場頂板在兩邊支承的情況下,采空側(cè)會形成“X—O”型的垮落形態(tài)。(4)采用巷內(nèi)強力支護方式和頂板自然垮落實現(xiàn)了蘭花寶欣礦無巷旁充填沿空留巷技術(shù),截至2017年1月,3103工作面已經(jīng)順利回采完畢,留巷長度達到660m,多回收煤炭約3.98萬t,增加收入約1122.18萬元,取得了階段性成功。本論文研究成果解決了蘭花寶欣礦礦井采掘接替緊張的難題,目前減少了3個掘進工作面,提高煤炭回采率10~20%,延長了礦井服務年限。
[Abstract]:The design output of Orchid Baoxin Coal Mine in Guxian County, Shanxi Province is 0.9 Mt / a. At present, the main coal seam No. 3 has an average coal thickness of 1.77 m, a dip angle of 4 擄10 擄and a buried depth of 400 m. It is located in the middle part of Shanxi formation and above the K7 fine sand rock. There are some problems such as tight working face and low recovery rate of resources. Therefore, taking No. 3 coal seam of Orchid Baoxin Coal Mine as the engineering background, this paper studies the technology of keeping roadway along goaf by filling side roadway without roadway. The main achievements are as follows: (1) the evolution law and stability of overburden rock structure with no roadway side filling along gob are analyzed and studied theoretically. At the end of the mining face, before replacing the mining face, the arc triangle block B is supported by the direct roof of the lower part and the gangue, and the clamping action of the adjacent block can achieve the equilibrium and stability of the large structure. During the influence of secondary mining, although the load borne by the large structure increases continuously, the stress state among the blocks changes, but the supporting conditions remain unchanged, so the random equilibrium state will be maintained to replace the work face after pushing. Large structure will be completely unstable. (2) analyzing the composition and mechanical characteristics of surrounding rock structure without roadway side filling along goaf retaining roadway, which means the combined support of roadway bolt and anchor cable, Roadway supporting and anchoring range of surrounding rock composed of Anchorage bearing system. In this paper, the early collapse of the roof with no roadway side filling along the gob is simplified as the mechanical model of bending failure of rectangular superimposed laminates supported by three or four sides, and the auxiliary supporting load in the roadway collapses for the first time, respectively. Based on the geological conditions of No. 3 coal seam in Orchid Baoxin Coal Mine, the 3DEC discrete element numerical analysis method is used. This paper simulates the mining process of 3103 and 3105 working face without roadway side filling along goaf retaining roadway, studies the deformation law of surrounding rock and the variation characteristics of stress in the second mining process of roadway side filling and gob retaining roadway without roadway side filling. When 3103 face is mined, the deformation of surrounding rock and the variation of stress in the second mining process are studied. In the range of 10m~30m at the back of the face, the roof of the roadway is the most severe, with a subsidence velocity of 12.2mm / d ~ 18.1mm / d and a maximum subsidence of 122mm / 175mm. During the mining of 3105 face, within the range of 10 m ahead of the working face to 25 m behind the working face, the roof of the roadway sinks sharply. Before the roadway is scrapped, the subsidence speed reaches 35.5mm / dT 41.1 mm / d, and the maximum subsidence of the roof reaches 350mm / 435mm. In the mining process of 17 / 22 / 3105 working face for coal seam thickness, the roof of the stope near the 3103 goaf area first forms arc triangle caving, then develops to O type collapse. Therefore, it is inferred that under the present geological conditions, if the roof of the stope with no roadway side filling along the gob is supported on both sides, The caving side will form the "X-O" type collapse form. (4) by adopting the strong support in the roadway and the natural roof collapse, the technology of keeping the roadway along the gob without side filling in Orchid Baoxin Mine has been realized. As of January 2017, The 3103 face has been successfully mined, the length of the roadway is 660m, the coal recovery is about 39800 tons, and the income is about 11.2218 million yuan, and the stage success has been achieved. The research results of this paper have solved the difficult problem of mining replacement in Orchid Baoxin Mine. At present, it has reduced 3 working faces, increased the coal recovery rate by 10 ~ 20, and prolonged the service life of the mine.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD353
本文編號：2423508
[Abstract]:The design output of Orchid Baoxin Coal Mine in Guxian County, Shanxi Province is 0.9 Mt / a. At present, the main coal seam No. 3 has an average coal thickness of 1.77 m, a dip angle of 4 擄10 擄and a buried depth of 400 m. It is located in the middle part of Shanxi formation and above the K7 fine sand rock. There are some problems such as tight working face and low recovery rate of resources. Therefore, taking No. 3 coal seam of Orchid Baoxin Coal Mine as the engineering background, this paper studies the technology of keeping roadway along goaf by filling side roadway without roadway. The main achievements are as follows: (1) the evolution law and stability of overburden rock structure with no roadway side filling along gob are analyzed and studied theoretically. At the end of the mining face, before replacing the mining face, the arc triangle block B is supported by the direct roof of the lower part and the gangue, and the clamping action of the adjacent block can achieve the equilibrium and stability of the large structure. During the influence of secondary mining, although the load borne by the large structure increases continuously, the stress state among the blocks changes, but the supporting conditions remain unchanged, so the random equilibrium state will be maintained to replace the work face after pushing. Large structure will be completely unstable. (2) analyzing the composition and mechanical characteristics of surrounding rock structure without roadway side filling along goaf retaining roadway, which means the combined support of roadway bolt and anchor cable, Roadway supporting and anchoring range of surrounding rock composed of Anchorage bearing system. In this paper, the early collapse of the roof with no roadway side filling along the gob is simplified as the mechanical model of bending failure of rectangular superimposed laminates supported by three or four sides, and the auxiliary supporting load in the roadway collapses for the first time, respectively. Based on the geological conditions of No. 3 coal seam in Orchid Baoxin Coal Mine, the 3DEC discrete element numerical analysis method is used. This paper simulates the mining process of 3103 and 3105 working face without roadway side filling along goaf retaining roadway, studies the deformation law of surrounding rock and the variation characteristics of stress in the second mining process of roadway side filling and gob retaining roadway without roadway side filling. When 3103 face is mined, the deformation of surrounding rock and the variation of stress in the second mining process are studied. In the range of 10m~30m at the back of the face, the roof of the roadway is the most severe, with a subsidence velocity of 12.2mm / d ~ 18.1mm / d and a maximum subsidence of 122mm / 175mm. During the mining of 3105 face, within the range of 10 m ahead of the working face to 25 m behind the working face, the roof of the roadway sinks sharply. Before the roadway is scrapped, the subsidence speed reaches 35.5mm / dT 41.1 mm / d, and the maximum subsidence of the roof reaches 350mm / 435mm. In the mining process of 17 / 22 / 3105 working face for coal seam thickness, the roof of the stope near the 3103 goaf area first forms arc triangle caving, then develops to O type collapse. Therefore, it is inferred that under the present geological conditions, if the roof of the stope with no roadway side filling along the gob is supported on both sides, The caving side will form the "X-O" type collapse form. (4) by adopting the strong support in the roadway and the natural roof collapse, the technology of keeping the roadway along the gob without side filling in Orchid Baoxin Mine has been realized. As of January 2017, The 3103 face has been successfully mined, the length of the roadway is 660m, the coal recovery is about 39800 tons, and the income is about 11.2218 million yuan, and the stage success has been achieved. The research results of this paper have solved the difficult problem of mining replacement in Orchid Baoxin Mine. At present, it has reduced 3 working faces, increased the coal recovery rate by 10 ~ 20, and prolonged the service life of the mine.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD353
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