【摘要】：本文針對丁集煤礦11-2煤層、13-1煤層瓦斯賦存實際情況,測試得到了11-2、13-1兩煤層的瓦斯基礎(chǔ)參數(shù),通過把兩煤層的透氣性系數(shù)與抽采難易程度標(biāo)準(zhǔn)相對照判斷得到：11-2煤層1#鉆孔處和13-1煤層2#鉆孔處煤層抽采難易程度都為勉強抽采。 從現(xiàn)場試驗可以看出壓降法測定底板穿層鉆孔抽采影響半徑是一種簡單、有效的方法。本文對壓降法的測試原理及具體方法進行了探討研究,并將該方法在丁集煤礦進行了現(xiàn)場試驗,測試結(jié)果如下：丁集煤礦13-1煤層在采用孔徑94mmm抽采鉆孔進行煤層瓦斯抽采,當(dāng)抽采負壓為24KPa,抽采時間為43d時,其抽采影響半徑為4m,抽采51d后影響半徑為5m；測試到了11-2煤層在采用94mm鉆孔進行煤層瓦斯抽采,當(dāng)抽采負壓為24KPa,抽采時間為36d時,其抽采影響半徑為3m,且可知瓦斯抽采鉆孔抽采47d時影響半徑為4.5m,抽采54d后影響半徑為5m。根據(jù)抽采時間與半徑之間的關(guān)系,優(yōu)化了11-2煤層、13-1煤層底板穿層鉆孔的布置,將相鄰兩個預(yù)抽鉆孔間距6m優(yōu)化為l0m間距布置,避免了設(shè)計和施工過程中煤層內(nèi)出現(xiàn)鉆孔的無效重疊,該測試結(jié)果為丁集煤礦瓦斯抽采及防治工作提供了重要依據(jù)。
[Abstract]:In this paper, according to the actual situation of gas occurrence in 11-2 coal seam and 13-1 coal seam in Dingji Coal Mine, the gas foundation parameters of 11 ~ 2N ~ (13) ~ (-1) coal seam are obtained by testing. By comparing the permeability coefficient of the two coal seams with the standard of extraction difficulty, it is concluded that the difficulty degree of extracting coal seam at the # 11-2 coal seam and the 13-1 coal seam borehole is forced extraction. It can be seen from the field test that the pressure drop method is a simple and effective method for determining the influence radius of borehole pumping through the bottom layer. In this paper, the testing principle and concrete method of pressure drop method are studied, and the field test of this method is carried out in Dingji Coal Mine. The test results are as follows: 13-1 coal seam in Dingji Coal Mine is using hole diameter 94mmm drainage borehole to carry out coal seam gas drainage. When the suction negative pressure is 24 KPA and the extraction time is 43 days, the influence radius of extraction is 4 m, and the influence radius is 5 m after 51 days of extraction. The test results show that 11-2 coal seam is using 94mm borehole to extract coal seam gas, when the suction negative pressure is 24 KPA, and the extraction time is 36 days, The influence radius of gas extraction is 3 m, and the influence radius is 4.5 m in 47 days and 5 m after 54 days of gas extraction. According to the relation between the extraction time and the radius, the arrangement of drilling holes in the floor of coal seam No. 13-1 in 11-2 coal seam is optimized, and the interval between the adjacent two pre-pumping boreholes is optimized to be 10 m spacing. The invalid overlap of boreholes in the coal seam during the design and construction is avoided. The test results provide an important basis for gas extraction and prevention in Dingji Coal Mine.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TD712

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