二氧化碳致裂器泄能关键参数研究
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摘要
为致裂器爆破能达到最佳的效果,开展了准静态强度测试、动态爆破致裂试验,分析了二氧化碳致裂器泄放压力与定压剪切片厚度、发热材料用量和液态二氧化碳充装量之间的关系,并得出了泄放压力模型;通过压力的计算分析和三维流体模拟,分析出泄能口的最优布置方式。试验结果表明:定压剪切片厚度为3 mm时,准静态抗剪强度为130 MPa,合理的发热材料用量为113 g,泄放压力峰值约为185 MPa;厚度为4 mm时,准静态抗剪强度为220 MPa,合理的发热材料用量为163 g,泄放压力峰值约为263 MPa;在保证整体刚度和使用寿命前提下,尽量减小泄能通道长度,增大孔直径,断面面积与定压剪切片破断面积相同,腔内壁光滑,泄能口倾角75°为宜。
In order to achieve the best blasting effect, quasi static strength test and dynamic blasting splitting test were carried out. And the release pressure and the thickness of the constant pressure shear sheet of the carbon dioxide fracturers were analyzed, and the relationship between the amount of heating material and the filling amount of liquid carbon dioxide were determined. Finally, the model of discharge pressure were obtained. The optimal layout of the outlet was analyzed through the calculation and analysis of pressure and three-dimensional fluid simulation. The test results showed that when the thickness of the shear sheet was 3 mm, the quasi-static shear strength was 130 MPa, and the reasonable amount of heating material was 113 g,and the peak discharge pressure was about 185 MPa. When the thickness was 4 mm, the quasi-static shear strength was 220 MPa, and the reasonable amount of heating material was 163 g, and the peak discharge pressure was about 263 MPa. Under the premise of guaranteeing the overall stiffness, the length of the discharge channel was minimized and the diameter of the hole was increased. The cross section area was the same as that of the constant pressure shearing slice, the cavity wall was smooth and the angle of outlet inclination was 75 °.
In order to achieve the best blasting effect, quasi static strength test and dynamic blasting splitting test were carried out. And the release pressure and the thickness of the constant pressure shear sheet of the carbon dioxide fracturers were analyzed, and the relationship between the amount of heating material and the filling amount of liquid carbon dioxide were determined. Finally, the model of discharge pressure were obtained. The optimal layout of the outlet was analyzed through the calculation and analysis of pressure and three-dimensional fluid simulation. The test results showed that when the thickness of the shear sheet was 3 mm, the quasi-static shear strength was 130 MPa, and the reasonable amount of heating material was 113 g,and the peak discharge pressure was about 185 MPa. When the thickness was 4 mm, the quasi-static shear strength was 220 MPa, and the reasonable amount of heating material was 163 g, and the peak discharge pressure was about 263 MPa. Under the premise of guaranteeing the overall stiffness, the length of the discharge channel was minimized and the diameter of the hole was increased. The cross section area was the same as that of the constant pressure shearing slice, the cavity wall was smooth and the angle of outlet inclination was 75 °.
引文
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[3]贺超.基于二氧化碳深孔预裂增透技术的低透煤层瓦斯治理[J].煤炭科学技术,2017,45(6):67-72.
[4]黄园月,尹岚岚,倪昊,等.二氧化碳致裂器研制与应用[J].煤炭技术,2015,34(8):123-124.
[5]霍中刚.二氧化碳致裂器深孔预裂爆破煤层增透新技术[J].煤炭科学技术,2015,43(2):80-83.
[6]康玉.煤气泄漏装置的数值模拟与试验研究[D].秦皇岛:燕山大学,2011.
[7]孟祥甜,刘磐,倪昊,等.CO2致裂器药卷最小起爆长度试验[J].煤矿安全,2018,49(1):53-56.
[8]严成增,孙冠华,郑宏,等.爆炸气体驱动下岩体破裂的有限元-离散元模拟[J].岩土力学,2015,36(8):2419-2425.
[9]李宁,陈莉静,张平.爆生气体驱动岩石裂缝动态扩展分析[J].岩土工程学报,2006,28(4):460-463.
[10]李宁,SWOBODA G.爆破荷载的数值模拟与应用[J].岩石力学与工程学报,1994,13(4):357-364.
[11]赵新涛,刘东燕,程贵海,等.爆生气体作用机理及岩石裂纹扩展分析[J].重庆大学学报,2011,34(6):75.
[12]李炜.数值分析模拟爆生气体作用下岩石裂纹扩展研究进展[J].工程建设,2008,40(2):16-22.
[13]凌伟明,杨永琦.爆生气体在光面爆破中的作用[J].煤炭学报,1990,15(1):73-82.
[14]杨小林,孙博,褚怀保.爆生气体在煤体爆破过程中的作用分析[J].金属矿山,2011(11):65-68.