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 ar-ea, the uniaxial compression test and the wave velocity testwere conducted on the weak interlayer rock samples without inter-layers 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 conclu-ded as follows. Firstly, the weak interlayer had an obviously weakening effect on the uniaxial compressive strength of coal bear-ing 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 in-clination 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%.
作者
汤友生
姚海林
廖阳
卢正
岳万轩
TANG Yousheng;YAO Hailin;LIAO Yang;LU Zheng;YUE;Wanxuan(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Geosciences and Info-Physics,Central South University,Changsha,Hunan 410083,China;China United Engineering Corporation Limited,Hangzhou,Zhejiang 310052,China)
出处
《矿业研究与开发》
CAS
北大核心
2018年第8期51-55,共5页
Mining Research and Development
基金
国家自然科学基金资助项目(41472286)
中国科学院青年创新促进会资助项目
湖北省杰出青年基金资助项目(2017CFA056).
关键词
煤系砂岩
软弱夹层
倾角
单轴抗压强度
波速
Coal bearing sandstone
Weak interlayer
Inclination
Uniaxial compressive strength
Wave velocity
