不同围压下黄砂岩力学特征与声发射特征
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摘要
为研究不同围压下黄砂岩的力学特征、声发射特征和岩石破裂形态,采用ROCK 600-50型岩石三轴流变仪与声发射系统对黄砂岩进行常规三轴试验,研究不同围压下的黄砂岩的峰值应力、峰值应变、残余强度及破坏形态变化特征,讨论了黄砂岩破裂过程声发射计数演化规律。结果表明:黄砂岩试件的峰值应力、轴向峰值应变和残余强度均随围压的增加而增大,围压对径向峰值应变影响较弱,通过对声发射计数分析,黄砂岩破坏程度随围压增大更加剧烈,会出现二次或多次破坏,围压减少了黄砂岩破坏过程中主裂纹数目,并明显抑制了次生裂纹的产生。
To study the mechanical characteristics of yellow sandstone under different confining pressures, acoustic emission characteristics and rock fracture morphology, using ROCK 600-50 rock tri-axial rheological apparatus and acoustic emission system to carry out the conventional tri-axial test for yellow sandstone, to study the peak stress, peak strain, residual strength and mode of post-embedded of yellow sandstone in different confining pressures and discuss the evolution of acoustic emission counting in yellow-sandstone fracture process. The results show that: the peak stress, axial peak strain and residual strength of yellow sandstone specimens increase with the increase of confining pressure; the influence of confining pressure on radial peak strain is weaker; through the analysis of acoustic emission counting, yellow sandstone damage degree is more intense with the increase of confining pressure, and secondary or multiple failures may occur. Confining pressure reduces the number of yellow sandstone main cracks in the process of failure, and significantly inhibits the production of the secondary cracks.
To study the mechanical characteristics of yellow sandstone under different confining pressures, acoustic emission characteristics and rock fracture morphology, using ROCK 600-50 rock tri-axial rheological apparatus and acoustic emission system to carry out the conventional tri-axial test for yellow sandstone, to study the peak stress, peak strain, residual strength and mode of post-embedded of yellow sandstone in different confining pressures and discuss the evolution of acoustic emission counting in yellow-sandstone fracture process. The results show that: the peak stress, axial peak strain and residual strength of yellow sandstone specimens increase with the increase of confining pressure; the influence of confining pressure on radial peak strain is weaker; through the analysis of acoustic emission counting, yellow sandstone damage degree is more intense with the increase of confining pressure, and secondary or multiple failures may occur. Confining pressure reduces the number of yellow sandstone main cracks in the process of failure, and significantly inhibits the production of the secondary cracks.
引文
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[15]顾义磊,吴文杰,李清淼,等.不同围压下岩石全应力应变及卸载过程声发射特征[J].煤矿安全,2015,46(6):36-39.
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[17]杨永明,鞠杨,陈佳亮,等.三轴应力下致密砂岩的裂纹发育特征与能量机制[J].岩石力学与工程学报,2014,33(4):691-698.
[18]王思洋,孙超杰,郭鹏飞,等.基于声发射的大理岩破坏模式研究[J].化工矿物与加工,2018(5):32-35.
[2]何满潮,钱七虎.深部岩体力学基础[M].北京:科学出版社,2010.
[3]李林峰.加载和卸围压条件下岩石力学特性的对比研究[J].地下空间与工程学报,2013,9(1):55-60.
[4]张颖,李明,王可慧,等.岩石动态力学性能试验研究[J].岩石力学与工程学报,2010,29(S2):4153-4158.
[5]赵星光,马利科,苏锐,等.北山深部花岗岩在压缩条件下的破裂演化与强度特性[J].岩石力学与工程学报,2014,33(S2):3665-3675.
[6]王吉渊.围压对煤体力学性质影响的实验研究[J].煤矿安全,2010,41(12):14-16.
[7]刘刚,李明.煤岩单轴与三轴压缩试验研究[J].煤矿安全,2013,44(7):4-6.
[8]杨永杰,王德超,郭明福,等.基于三轴压缩声发射试验的岩石损伤特征研究[J].岩石力学与工程学报,2014,33(1):98-104.
[9]苏承东,翟新献,李宝富,等.砂岩单三轴压缩过程中声发射特征的试验研究[J].采矿与安全工程学报,2011,28(2):225-230.
[10]许江,李树春,唐晓军,等.基于声发射的岩石疲劳损伤演化[J].工程科学学报,2009,31(1):19-24.
[11]张黎明,马绍琼,任明远,等.不同围压下岩石破坏过程的声发射频率及b值特征[J].岩石力学与工程学报,2015(10):2057-2063.
[12]张黎明,王在泉,石磊,等.不同应力路径下大理岩破坏过程的声发射特性[J].岩石力学与工程学报,2012,31(6):1230-1236.
[13]张为民,卜滕滕.围压效应下煤岩组合体破坏与裂纹发育的细观模拟[J].煤矿安全,2017,48(11):45.
[14]任非.三轴压缩条件下煤岩力学特性及破坏模式[J].煤矿安全,2018,49(1):37-39.
[15]顾义磊,吴文杰,李清淼,等.不同围压下岩石全应力应变及卸载过程声发射特征[J].煤矿安全,2015,46(6):36-39.
[16]张磊,贾奇锋.单轴加载过程煤样声发射及损伤特征实验研究[J].煤矿安全,2017,48(10):43-46.
[17]杨永明,鞠杨,陈佳亮,等.三轴应力下致密砂岩的裂纹发育特征与能量机制[J].岩石力学与工程学报,2014,33(4):691-698.
[18]王思洋,孙超杰,郭鹏飞,等.基于声发射的大理岩破坏模式研究[J].化工矿物与加工,2018(5):32-35.