【摘要】：在我國(guó)煤炭井工開(kāi)采的比例比較高,隨著井工開(kāi)采深度的增加,我國(guó)煤礦安全生產(chǎn)將面臨地應(yīng)力升高、瓦斯壓力增大等嚴(yán)峻問(wèn)題。針對(duì)青東煤礦松軟低透氣性煤層,煤體松軟,煤體破壞程度較高,煤體透氣性較差等特點(diǎn),采用傳統(tǒng)防突措施,現(xiàn)場(chǎng)抽排效果不佳,給現(xiàn)場(chǎng)煤與瓦斯突出防治工作帶來(lái)諸多困難,因此采取水力沖孔措施提高煤體透氣性,提高瓦斯抽采效率是防治煤與瓦斯突出、提高煤炭安全高效開(kāi)采行之有效的方法。 本文在分析水力沖孔過(guò)程動(dòng)力特性、影響水射流破煤因素的基礎(chǔ)上,利用ANSYS/LS-DYNA數(shù)值模擬對(duì)水射流侵蝕煤體動(dòng)態(tài)過(guò)程分析,并分析計(jì)算水力沖孔對(duì)鉆孔周?chē)后w的應(yīng)力、應(yīng)變變化影響。在青東煤礦728工作面頂板巖巷實(shí)施水力沖孔措施工業(yè)試驗(yàn),平均單孔沖煤量1.3t,水力沖孔前后鉆孔直徑擴(kuò)大到593.4mm,較沖孔前增大6.3倍。對(duì)水力沖孔后瓦斯抽采濃度和瓦斯抽采純量考察,單孔最大瓦斯?jié)舛葲_孔后峰值6.53%,較沖孔前平均值提高6.5倍；最大瓦斯抽采純流量沖孔后最高值0.4m3/min,比沖孔前增加0.33m3/min,提高5.7倍；試驗(yàn)區(qū)最大殘余瓦斯壓力0.21MPa,最大殘余瓦斯含量3.17m3/t,驗(yàn)證水力沖孔的卸壓增透效果。結(jié)合在煤巷工作面掘進(jìn)過(guò)程中的鉆屑瓦斯解吸指標(biāo)K1(mL/gmin1/2)最大值為0.11,最大鉆屑量Smax(Kg)最大值為3.9,"縣2(Pa)最大值為80,瓦斯放散初速度△p最大值為8mmHg,煤體堅(jiān)固性系數(shù)大于0.7等突出指標(biāo)進(jìn)行了分析,頂板巷下向鉆孔水力沖孔消突效果顯著,該技術(shù)為82采區(qū)的728工作面投產(chǎn)節(jié)省了時(shí)間,經(jīng)濟(jì)效益顯著。
[Abstract]:The proportion of coal miners is relatively high in our country. With the increase of mining depth, the safety production of coal mines in our country will face some serious problems, such as the increase of in-situ stress and the increase of gas pressure. In view of the characteristics of soft and low permeability coal seam in Qingdong coal mine, the coal body is soft, the destruction degree of coal body is high, and the gas permeability of coal body is poor, the effect of field drainage is not good by adopting traditional anti-outburst measures. It is difficult to prevent coal and gas outburst on the spot, so it is an effective method to prevent coal and gas outburst and to improve the safety and efficiency of coal mining by taking hydraulic punching measures to improve the permeability of coal body and improve the efficiency of gas extraction. On the basis of analyzing the dynamic characteristics of hydraulic punching process and influencing factors of water jet breaking coal, the dynamic process of water jet eroding coal body is analyzed by ANSYS/LS-DYNA numerical simulation, and the stress of hydraulic punching on coal body around borehole is analyzed and calculated. The effect of strain variation. The industrial test of hydraulic punching measures in the roof rock roadway of No. 728 working face of Qingdong Coal Mine shows that the average coal flushing capacity of single hole is 1.3 t, the diameter of borehole before and after hydraulic punching expands to 593.4 mm, which is 6.3 times larger than that before punching. The concentration of gas extraction and the scalar amount of gas extraction after hydraulic punching are investigated. The peak value of the maximum gas concentration in single hole after punching is 6.53, which is 6.5 times higher than the average before punching. The maximum value of 0.4m3 / min after punching was increased by 0.33m3 / min, which was 5.7 times higher than that before punching. The maximum residual gas pressure is 0.21 MPA and the maximum residual gas content is 3.17 m3 / t in the test area. The maximum value of gas desorption index K1 (mL/gmin1/2) is 0.11, the maximum value of Smax (Kg) is 3.9, the maximum value of county 2 (Pa) is 80, the maximum value of K1 (mL/gmin1/2) is 0.11 and the maximum value of Smax (Kg) is 3.9, respectively. The maximum initial velocity p of gas release is 8mm Hg, and the coal body firmness coefficient is greater than 0.7. The outburst suppression effect of hydraulic punching in the bottom of roof roadway is remarkable. This technique saves time for 728 working face in 82 mining area. The economic benefit is remarkable.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TD713

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