软弱夹层倾角对煤系砂岩物理力学特性的影响研究
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摘要
针对某矿区煤系砂岩软弱夹层倾角分布各异的特点,分别对不含夹层及倾角为0°,30°,45°,60°和90°的软弱夹层岩样进行单轴压缩试验及波速测试,探讨不同软弱夹层倾角对煤系砂岩单轴抗压强度及岩石完整性等特性的影响,研究结果表明:(1)软弱夹层对煤系砂岩的单轴抗压强度具有明显的弱化作用;(2)软弱夹层对煤系砂岩强度的弱化整体趋势为随夹层倾角的增加呈现出先减小、再增大,其中30°的夹层对强度弱化最显著,使岩石单轴抗压强度降低19.1%,且轴向变形增大17.7%;90°的夹层弱化作用最小,强度仅降低4.9%,且变形基本一致;(3)与对强度的影响类似,软弱夹层对波速同样产生弱化作用,整体趋势为先减小后增大,其中30°的夹层对波速影响较大,相比完整岩石,波速降低11%,而90°夹层对波速影响最小,仅降低2.0%。
Aimed at the uneven distribution properties of the weak interlayer inclination of coal bearing sandstone in a mining area,the uniaxial compression test and the wave velocity testwere conducted on the weak interlayer rock samples without interlayers and with inclination angles of 0°,30°,45°,60°and 90°.Then the effects of different inclination angles of weak interlayers on the uniaxial compressive strength and rock integrity of coal bearing sandstone were discussed.The study results were concluded as follows.Firstly,the weak interlayer had an obviously weakening effect on the uniaxial compressive strength of coal bearing sandstone.Secondly,the overall trend that the weak interlayer weaken the uniaxial compressive strength of coal bearing sandstone decreased and then increased with increasing interlayer inclination.The interlayer inclination angle of 30°had the most obviously weakening effect on the strength,which made the uniaxial compressive strength of rock reduced by 19.1%,and the axial deformation increased by 17.7%.And the interlayer inclination angle of 90°had less weakening effects,which made the strength decreased by 4.9%,and the deformation was basically the same.Thirdly the weak interlayer had a weakening effect on wave velocity,which was similar to the strength.The overall trend firstly reduced and then raised.The interlayer inclination angle of 30°had an obviously weakening effect on the wave velocity.Compared to intact rocks,the wave velocity was reduced by 11%,whereas the inclination angle of 90°had less weakening effects on the wave velocity,and only decreased by 2%.
Aimed at the uneven distribution properties of the weak interlayer inclination of coal bearing sandstone in a mining area,the uniaxial compression test and the wave velocity testwere conducted on the weak interlayer rock samples without interlayers and with inclination angles of 0°,30°,45°,60°and 90°.Then the effects of different inclination angles of weak interlayers on the uniaxial compressive strength and rock integrity of coal bearing sandstone were discussed.The study results were concluded as follows.Firstly,the weak interlayer had an obviously weakening effect on the uniaxial compressive strength of coal bearing sandstone.Secondly,the overall trend that the weak interlayer weaken the uniaxial compressive strength of coal bearing sandstone decreased and then increased with increasing interlayer inclination.The interlayer inclination angle of 30°had the most obviously weakening effect on the strength,which made the uniaxial compressive strength of rock reduced by 19.1%,and the axial deformation increased by 17.7%.And the interlayer inclination angle of 90°had less weakening effects,which made the strength decreased by 4.9%,and the deformation was basically the same.Thirdly the weak interlayer had a weakening effect on wave velocity,which was similar to the strength.The overall trend firstly reduced and then raised.The interlayer inclination angle of 30°had an obviously weakening effect on the wave velocity.Compared to intact rocks,the wave velocity was reduced by 11%,whereas the inclination angle of 90°had less weakening effects on the wave velocity,and only decreased by 2%.
引文
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[2]何玉红.单轴荷载下砂岩波速特征与损伤演化规律研究[J].地下空间与工程学报,2016,12(1):44-48.
[3]向新益.非贯穿性节理对岩体单轴抗压强度的影响[J].人民黄河,2015,37(2):119-122.
[4]闫月龙,徐涛,任思玉,等.节理产状对岩石单轴抗压强度的影响研究[J].地下空间与工程学报,2016,12(4):897-903.
[5]刘恺德,刘泉声,朱元广,等.考虑层理方向效应煤岩巴西劈裂及单轴压缩试验研究[J].岩石力学与工程学报,2013,32(2):308-316.
[6]侯鹏,高峰,杨玉贵,等.考虑层理影响页岩巴西劈裂及声发射试验研究[J].岩土力学,2016,37(6):1603-1612.
[7]周斌.湘西红砂岩顺层边坡稳定可靠度分析和风险评估[D].长沙:中南大学,2010.
[8]Gehle C,Kutter H K.Breakage and shear behavior of intermittent rock joints[J].The International Journal of Rock Mechanics&Mining Sciences,2003,40(5):687-700.
[9]Zuo Jianping,Wang Zhaofeng,Zhou Hongwei,et al.Failure behavior of a rock-coal-rock combined body with a weak coal interlayer[J].International Journal of Mining Science and Technology,2013,23(6):907-912.
[10]宋彦琦,李名,刘江,等.含不同倾角天然软弱夹层的大理岩破坏试验[J].中国矿业大学学报,2015,44(4):623-629.
[11]赵永红,杨振涛.含软弱夹层岩石材料的损伤破坏过程[J].岩石力学与工程学报,2005,24(13):2350-2356.
[12]李银平,刘江,杨春和.泥岩夹层对盐岩变形和破损特征的影响分析[J].岩石力学与工程学报,2006,25(12):2461-2461.
[13]郭富利,张顶立,苏洁,等.软弱夹层引起围岩系统强度变化的试验研究[J].岩土工程学报,2009,31(5):720-726.
[14]蒋昱州,徐卫亚,朱杰兵,等.含断续软弱夹层岩石流变力学特性研究[J].长江科学院院报,2009,26(12):71-75.
[15]祁连光,杨科,陆伟,等.煤系地层岩石单轴抗压强度统计分析[J].煤炭科学技术,2013,41(2):100-103.
[16]重庆建筑工程学院,同济大学.岩体力学[M].北京:中国建筑工业出版社,1981:18-21.
[17]陈颙,黄庭芳,刘恩儒.岩石物理学[M].合肥:中国科学技术大学出版社,2009.