本文選題：切頂卸壓 + 沿空留巷��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：神華神東礦區(qū)由于煤柱留設(shè)造成煤炭資源的大量浪費(fèi),為改善此問(wèn)題采用切頂卸壓沿空留巷工藝。針對(duì)神華神東哈拉溝煤礦12201工作面的切頂卸壓無(wú)煤柱開(kāi)采項(xiàng)目,分析其預(yù)裂切縫的關(guān)鍵參數(shù),利用數(shù)值模擬驗(yàn)證設(shè)計(jì)的合理性;根據(jù)現(xiàn)場(chǎng)礦壓監(jiān)測(cè)數(shù)據(jù),分析工作面支承壓力的影響范圍;對(duì)比分析常規(guī)留巷模式和切頂留巷模式的異同,計(jì)算二者頂板壓力,得出各自支護(hù)強(qiáng)度的大小,從而判斷兩種留巷方式的優(yōu)缺點(diǎn)。以實(shí)用礦山壓力理論為基礎(chǔ)、理論力學(xué)為依托,采用理論分析、數(shù)值模擬、工程實(shí)踐等多角度對(duì)上述問(wèn)題進(jìn)行分析探討,現(xiàn)得出以下主要結(jié)論:(1)對(duì)哈拉溝礦的工程地質(zhì)條件進(jìn)行分析研究,對(duì)切頂成巷進(jìn)行理論分析,在前人研究的基礎(chǔ)上構(gòu)建力學(xué)模型,分析研究發(fā)現(xiàn)切頂留巷的成功關(guān)鍵取決于切縫的高度和角度,采用合理的切縫可以保證切頂留巷的成功;(2)針對(duì)哈拉溝礦12201工作面地質(zhì)條件進(jìn)行設(shè)計(jì),采用最為適合該礦的預(yù)裂切縫,高度、角度、間距,采用此種設(shè)計(jì)可以達(dá)到采空區(qū)上覆巖層完全垮落,但不影響沿空順槽圍巖穩(wěn)定性,對(duì)比其他高度、角度的切縫利用數(shù)值模擬分析切縫的可行性,發(fā)現(xiàn)哈拉溝礦最佳切縫高度為6m,最佳切縫角度為10°,最佳切縫間距為600mm;(3)本文系統(tǒng)性的闡述了對(duì)淺埋復(fù)合頂板薄煤層在切頂卸壓沿空留巷過(guò)程中工作面支承壓力影響,研究發(fā)現(xiàn)針對(duì)哈拉溝礦切頂卸壓沿空留巷工程而言,采用切頂成巷工藝超前支承壓力影響范圍為25m左右,支承壓力影響范圍為90～150m左右;(4)經(jīng)過(guò)理論計(jì)算之后發(fā)現(xiàn),切頂卸壓沿空留巷工藝比常規(guī)沿空留巷工藝支護(hù)強(qiáng)度小,同時(shí)安全可行性高,具有明顯的優(yōu)勢(shì)。
[Abstract]:In Shenhua-Shendong mining area, coal resources are wasted because of coal pillar retention. In order to improve this problem, cutting top pressure relief technology along goaf is adopted. In view of the mining project of cutting roof and releasing pressure without pillar in 12201 face of Shenhua Shen-Donghalagou Coal Mine, the key parameters of its pre-splitting joint are analyzed, and the rationality of the design is verified by numerical simulation, and according to the monitoring data of mine pressure on the spot, This paper analyzes the influence range of supporting pressure in working face, compares and analyzes the similarities and differences between conventional retaining roadway mode and cutting top retaining roadway mode, calculates the roof pressure of both, obtains the magnitude of support strength, and judges the merits and demerits of two kinds of retaining roadway modes. Based on practical mine pressure theory and theoretical mechanics, the above problems are analyzed and discussed from many angles, such as theoretical analysis, numerical simulation, engineering practice, etc. The main conclusions are as follows: (1) the engineering geological conditions of Haagou Mine are analyzed, and the theoretical analysis of the roof cutting roadway is carried out, and the mechanical model is constructed on the basis of previous studies. It is found that the key to success of cutting top and retaining roadway depends on the height and angle of cutting joint, and reasonable cutting joint can guarantee the success of cutting top retaining roadway. (2) the geological condition of 12201 face in Hagagou Coal Mine is designed. Adopting the most suitable pre-crack cutting joint, height, angle, spacing, this design can achieve the complete collapse of overlying strata in goaf, but it does not affect the stability of surrounding rock along the goaf trench, compared with other heights. The angle of the slit is analyzed by numerical simulation. It is found that the optimum height of cutting joint is 6 m, the optimum angle of cut joint is 10 擄, and the optimum spacing of cutting joint is 600mm. (3) the paper systematically expounds the influence of the supporting pressure on the working face of shallow composite roof thin coal seam in the process of cutting and unloading along the gob roadway. It is found that the influence range of leading support pressure is about 25m and the influence range of supporting pressure is about 90 ~ 150m for the roadway engineering of Haagou Mine. (4) after theoretical calculation, it is found that the influence range of leading support pressure is about 25 m, and that the influence range of supporting pressure is about 90 ~ 150 m. (4) after theoretical calculation, it is found that, The technology of cutting the top and releasing the pressure along the gob retaining roadway has less support intensity and higher safety and feasibility than the conventional gob-side roadway technology, so it has obvious advantages.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TD322

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