承压水作用下切顶卸压对煤层底板破坏深度影响的试验研究
|
摘要
为研究承压水作用下煤层顶板切顶卸压对煤层底板破坏深度的影响,以二维相似模拟试验台为基础,研制了简易底板承压水施加装置,并运用动态应变仪和全站型电子测距仪分别进行应力和位移监测。试验模拟了切顶卸压和常规开采条件下的煤层底板破坏深度情况,得到了2种不同条件下围岩应力场的变化规律和底板破坏深度值。试验结果显示:切顶卸压和不切顶卸压条件下,在近水体处的裂隙导升带破坏区别不大;监测到的煤层底板应力变化规律相似,但扰动强度不同。不切顶条件下的底板破坏深度比切顶条件下大,切顶卸压在一定程度上能够减小底板破坏深度。
To study the effect of reducing mine pressure by cutting roof strata on the depth of floor strata failure zones above the confined aquifers, a simple confined aquifer simulation device was developed based on a two-dimensional similar simulation test bed. Stress and displacement were respectively monitored by dynamic strain gauge and total station electronic distance meter. The variation of stress field in surrounding rock and the failure depth of floor strata were got under the conditions of both cutting roof strata and conventional mining conditions. The test results show that there is little difference in fracture conduction zone damage near water body between the two conditions, and the variation trend of the monitored stress is similar, while the stress disturbance intensity is different. The floor failure depth without roof cutting is greater than that under roof cutting, which indicates that the reasonable design of roof cutting can reduce the failure depth of floor to a certain extent.
To study the effect of reducing mine pressure by cutting roof strata on the depth of floor strata failure zones above the confined aquifers, a simple confined aquifer simulation device was developed based on a two-dimensional similar simulation test bed. Stress and displacement were respectively monitored by dynamic strain gauge and total station electronic distance meter. The variation of stress field in surrounding rock and the failure depth of floor strata were got under the conditions of both cutting roof strata and conventional mining conditions. The test results show that there is little difference in fracture conduction zone damage near water body between the two conditions, and the variation trend of the monitored stress is similar, while the stress disturbance intensity is different. The floor failure depth without roof cutting is greater than that under roof cutting, which indicates that the reasonable design of roof cutting can reduce the failure depth of floor to a certain extent.
引文
[1]曹胜根,姚强岭,王福海,等.承压水体上采煤底板突水危险性分析与治理[J].采矿与安全工程学报,2010(3):346-350.
[2]王兆会,杨胜利,孔德中,等.承压水上采煤底板破坏深度研究[J].煤矿安全,2014,45(1):17-20.
[3]尹立明.深部煤层开采底板突水机理基础实验研究[D].青岛:山东科技大学,2011.
[4]李见波,许延春.承压水渗流条件下预防陷落柱突水力学模型及应用[J].中国矿业大学学报,2016,45(2):217-224.
[5]赵继忠,冯利民,陈舰艇,等.承压水上开采工作面底板破坏深度相似模拟试验[J].煤矿安全,2015,46(6):32-35.
[6]王家臣,李见波,徐高明.导水陷落突水模拟试验台研制及应用[J].采矿与安全工程学报,2010,27(3):305-309.
[7]熊祖强,王晓蕾.承压水上工作面破坏及裂隙演化相似模拟试验[J].地下空间与工程学报,2014,10(5):1114-1120.
[8]魏世义,陈新明,许延春.高承压水过断层破碎带巷道稳定性研究[J].煤炭科学技术,2013,41(S2):8-10.
[9]杨映涛,李抗抗.用物理相似模拟技术研究煤层底板突水机理[J].煤田地质与勘探,1997(增刊):33-36.
[10]张杰,侯忠杰.固-液藕合试验材料的研究[J].岩石力学与工程学报,2004,23(18):3157-3161.
[11]刘爱华,彭述权,李夕兵,等.深部开采承压突水机制相似物理模型试验系统研制及应用[J].岩石力学与工程学报,2009,28(7):1335-1341.
[12]弓培林,胡耀青,赵阳升,等.带压开采底板变形破坏规律的三维相似模拟研究[J].岩石力学与工程学报,2005,24(23):4396-4402.
[2]王兆会,杨胜利,孔德中,等.承压水上采煤底板破坏深度研究[J].煤矿安全,2014,45(1):17-20.
[3]尹立明.深部煤层开采底板突水机理基础实验研究[D].青岛:山东科技大学,2011.
[4]李见波,许延春.承压水渗流条件下预防陷落柱突水力学模型及应用[J].中国矿业大学学报,2016,45(2):217-224.
[5]赵继忠,冯利民,陈舰艇,等.承压水上开采工作面底板破坏深度相似模拟试验[J].煤矿安全,2015,46(6):32-35.
[6]王家臣,李见波,徐高明.导水陷落突水模拟试验台研制及应用[J].采矿与安全工程学报,2010,27(3):305-309.
[7]熊祖强,王晓蕾.承压水上工作面破坏及裂隙演化相似模拟试验[J].地下空间与工程学报,2014,10(5):1114-1120.
[8]魏世义,陈新明,许延春.高承压水过断层破碎带巷道稳定性研究[J].煤炭科学技术,2013,41(S2):8-10.
[9]杨映涛,李抗抗.用物理相似模拟技术研究煤层底板突水机理[J].煤田地质与勘探,1997(增刊):33-36.
[10]张杰,侯忠杰.固-液藕合试验材料的研究[J].岩石力学与工程学报,2004,23(18):3157-3161.
[11]刘爱华,彭述权,李夕兵,等.深部开采承压突水机制相似物理模型试验系统研制及应用[J].岩石力学与工程学报,2009,28(7):1335-1341.
[12]弓培林,胡耀青,赵阳升,等.带压开采底板变形破坏规律的三维相似模拟研究[J].岩石力学与工程学报,2005,24(23):4396-4402.