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赵宏刚等:加卸载下原煤力学特性及渗透演化规律 ·1679· 性试验研究.工程科学学报,2015,37(8):971) -加卸载速率比,n=4.751 加卸载速率比,n=3.50:1 4]Li C H,Zhang L X,Yao ZQ,et al.Permeability characteristics 加卸载速率比,n=2.25】 and mechanism analysis of two types of rocks.J Univ Sci Technol 4 Beijing,2010,32(2):158 3 (李长洪,张立新,姚作强,等两种岩石的不同类型渗透特 性实验及其机理分析.北京科技大学学报,2010,32(2): 158) [5]Yin G Z,Jiang C B,Wang WZ,et al.Experimental study of in- 2000 4000 60008000 10000 fluence of confining pressure unloading speed on mechanical prop- 时间s erties and gas permeability of containinggas coal rock.Chin 图7渗透率时间关系曲线 Rock Mech Eng,2011,30(1)68 Fig.7 Relationship between permeability and time (尹光志,蒋长宝,王维忠,等.不同卸围压速度对含瓦斯煤 岩力学和瓦斯渗流特性影响试验研究.岩石力学与工程学 4结论 报,2011,30(1):68) Yin GZ,Jiang C B,Xu J,et al.An experimental study on effect (1)加卸载过程中,加卸载速率比n越大,峰值应 of water content on coalbed gas permeability in ground stress field. 力附近的曲线平台越长,轴向应变£,和环向应变e,也 Transp Porous Media,2012,94(1)87 ] Xu J.,Li BB,Zhou T,et al.Experimental study of coal deforma- 越大,体应变e,的变形量则越小.加卸载比4.75:1下 tion and permeability characteristics under loading-unloading con- 轴向应变和环向应变较3.50:1下分别提高39.85%和 ditions.J China Coal Soc,2012,37(9):1493 8.38%,3.50:1下较2.25:1下分别提高64.87%和 (许江,李波波,周婷,等.加卸载条件下煤岩变形特性与渗 496%:但速率比225:1下体应变e较4.75:1和3.50:1条 透特征的试验研究.煤炭学报,2012,37(9):1493) 件则分别提高448.15%和78.67%. 8] Jiang C B,Yin G Z,Huang Q X,et al.Experiment of deforma- (2)不同加卸载速率比n下含瓦斯煤变形模量均 tion property and gas permeation of containing gas coal under co 先迅速减小后缓慢减小,到破坏时再迅速降低,而后逐 fining pressure-unloading process.J China Coal Soc,2011,36 渐保持稳定.变形模量与应变关系在加卸载过程中可 (5):802 (蒋长宝,尹光志,黄启翔,等.含瓦斯煤岩卸围压变形特征 分为三个阶,且在相同轴向应变时,n越小,变形模量 及瓦斯渗流试验.煤炭学报,2011,36(5):802) 越大 9]Jiang C B,Huang G,Huang Q X.Experiment on deformation (3)偏应力一应变曲线与渗透率一应变曲线的变 failure and permeability evolution law of gas-containing coal under 化相对应.渗透率变化曲线可分为三个阶段:初始压 multi-stage unloading confining pressure.China Coal Soc, 密与弹性阶段、屈服破坏阶段和破坏后阶段.屈服破 2011,36(12):2039 坏阶段,加卸载速率比越小,煤样峰值处的体应变和 (蒋长宝,黄滚,黄启翔.含瓦斯煤多级式卸围压变形破坏及 渗透率演化规律实验.煤炭学报,2011,36(12):2039) 渗透率越大.速率比3.50:1时煤样体应变与渗透率较 [10]Li X Q,Yin GZ,Cai B.Experimental study of deformation and 4.75:1时分别增加212.5%和12.3%:速率比2.25:1 seepage properties of outburst coal samples under cyclic loading. 时较3.50:1时分别增加78%和15.4%.采用较慢速 Chin J Rock Mech Eng,2010,29(Suppl 2):3498 度开采,渗透率较高,有利于瓦斯的抽采与排放 (李晓泉,尹光志,蔡波.循环载荷下突出煤样的变形和渗 透特性试验研究.岩石力学与工程学报,2010,29(增刊2): 参考文献 3498) [Wang J A,Peng S P,Meng Z P.Permeability rule in full strain- [11]Zhao H B,Wang J C.Experimental study of evolution law of me- stress process of rock under triaxial compression.Unig Sci chanical properties of coal containing gas under unloading confi- Technol Beijing,2001,23(6):489 ning pressure.Rock Soil Mech,2011,32(Suppl 1):270 (王金安,彭苏萍,孟召平.岩石三轴全应力应变过程中的渗 (赵洪宝,王家臣.卸围压时含瓦斯煤力学性质演化规律试 透规律.北京科技大学学报,2001,23(6):489) 验研究.岩土力学,2011,32(增刊1):270) Yang Y J,Wang D C,Wang K,et al.Micro and meso-damage [12]Yin G Z,Li W P,Li M H,et al.Permeability properties and ef- mechanism of coal's strength and deformation characteristics.J fective stress of raw coal under loading-unloading conditions.J Unie Sci Technol Beijing,2011,33(6):653 China Coal Soc,2014,39 (8):1497 (杨永杰,王德超,王凯,等.煤岩强度及变形特征的微细观 (尹光志,李文璞,李铭辉,等。加卸载条件下原煤渗透率与 损伤机理.北京科技大学学报,2011,33(6):653) 有效应力的规律.煤炭学报,2014,39(8):1497) B]Kang X T,Yin GZ,Huang G,et al.Experiment research on gas [13]Zhu J,Jiang Y D,Zhao Y X,et al.Experimental study on per- seepage anisotropy in lowpermeability coal.Chin Eng,2015, meability of coal samples under the simultaneous action of unloa- 37(8):971 ding and loading.J China Coal Soc,35 (Suppl 1):76 (康向涛,尹光志,黄滚,等.低透气性原煤瓦斯渗流各向异 (祝捷,姜耀东,赵毅鑫,等.加卸荷同时作用下煤样渗透性赵宏刚等: 加卸载下原煤力学特性及渗透演化规律 图 7 渗透率--时间关系曲线 Fig. 7 Relationship between permeability and time 4 结论 ( 1) 加卸载过程中,加卸载速率比 n 越大,峰值应 力附近的曲线平台越长,轴向应变 ε1和环向应变 ε3也 越大,体应变 εv的变形量则越小. 加卸载比 4. 75∶ 1下 轴向应变和环向应变较 3. 50∶ 1下分别提高 39. 85% 和 8. 38% ,3. 50 ∶ 1 下 较 2. 25 ∶ 1 下 分 别 提 高 64. 87% 和 4. 96%; 但速率比2. 25∶ 1下体应变 εv较4. 75∶ 1和3. 50∶ 1条 件则分别提高 448. 15% 和 78. 67% . ( 2) 不同加卸载速率比 n 下含瓦斯煤变形模量均 先迅速减小后缓慢减小,到破坏时再迅速降低,而后逐 渐保持稳定. 变形模量与应变关系在加卸载过程中可 分为三个阶,且在相同轴向应变时,n 越小,变形模量 越大. ( 3) 偏应力--应变曲线与渗透率--应变曲线的变 化相对应. 渗透率变化曲线可分为三个阶段: 初始压 密与弹性阶段、屈服破坏阶段和破坏后阶段. 屈服破 坏阶段,加卸载速率比 n 越小,煤样峰值处的体应变和 渗透率越大. 速率比 3. 50∶ 1时煤样体应变与渗透率较 4. 75∶ 1时分别增加 212. 5% 和 12. 3% ; 速率比 2. 25∶ 1 时较 3. 50∶ 1时分别增加 78% 和 15. 4% . 采用较慢速 度开采,渗透率较高,有利于瓦斯的抽采与排放. 参 考 文 献 [1] Wang J A,Peng S P,Meng Z P. Permeability rule in full strain￾stress process of rock under triaxial compression. J Univ Sci Technol Beijing,2001,23( 6) : 489 ( 王金安,彭苏萍,孟召平. 岩石三轴全应力应变过程中的渗 透规律. 北京科技大学学报,2001,23( 6) : 489) [2] Yang Y J,Wang D C,Wang K,et al. Micro and meso-damage mechanism of coal’s strength and deformation characteristics. J Univ Sci Technol Beijing,2011,33( 6) : 653 ( 杨永杰,王德超,王凯,等. 煤岩强度及变形特征的微细观 损伤机理. 北京科技大学学报,2011,33( 6) : 653) [3] Kang X T,Yin G Z,Huang G,et al. Experiment research on gas seepage anisotropy in low-permeability coal. Chin J Eng,2015, 37( 8) : 971 ( 康向涛,尹光志,黄滚,等. 低透气性原煤瓦斯渗流各向异 性试验研究. 工程科学学报,2015,37( 8) : 971) [4] Li C H,Zhang L X,Yao Z Q,et al. Permeability characteristics and mechanism analysis of two types of rocks. J Univ Sci Technol Beijing,2010,32( 2) : 158 ( 李长洪,张立新,姚作强,等. 两种岩石的不同类型渗透特 性实验及其机理分析. 北京科技大学学报,2010,32 ( 2 ) : 158) [5] Yin G Z,Jiang C B,Wang W Z,et al. Experimental study of in￾fluence of confining pressure unloading speed on mechanical prop￾erties and gas permeability of containing-gas coal rock. Chin J Rock Mech Eng,2011,30( 1) : 68 ( 尹光志,蒋长宝,王维忠,等. 不同卸围压速度对含瓦斯煤 岩力学和瓦斯渗流特性影响试验研究. 岩石力学与工程学 报,2011,30( 1) : 68) [6] Yin G Z,Jiang C B,Xu J,et al. An experimental study on effect of water content on coalbed gas permeability in ground stress field. Transp Porous Media,2012,94( 1) : 87 [7] Xu J,Li B B,Zhou T,et al. Experimental study of coal deforma￾tion and permeability characteristics under loading--unloading con￾ditions. J China Coal Soc,2012,37( 9) : 1493 ( 许江,李波波,周婷,等. 加卸载条件下煤岩变形特性与渗 透特征的试验研究. 煤炭学报,2012,37( 9) : 1493) [8] Jiang C B,Yin G Z,Huang Q X,et al. Experiment of deforma￾tion property and gas permeation of containing-gas coal under con￾fining pressure--unloading process. J China Coal Soc,2011,36 ( 5) : 802 ( 蒋长宝,尹光志,黄启翔,等. 含瓦斯煤岩卸围压变形特征 及瓦斯渗流试验. 煤炭学报,2011,36( 5) : 802) [9] Jiang C B,Huang G,Huang Q X. Experiment on deformation failure and permeability evolution law of gas-containing coal under multi-stage unloading confining pressure. J China Coal Soc, 2011,36( 12) : 2039 ( 蒋长宝,黄滚,黄启翔. 含瓦斯煤多级式卸围压变形破坏及 渗透率演化规律实验. 煤炭学报,2011,36( 12) : 2039) [10] Li X Q,Yin G Z,Cai B. Experimental study of deformation and seepage properties of outburst coal samples under cyclic loading. Chin J Rock Mech Eng,2010,29( Suppl 2) : 3498 ( 李晓泉,尹光志,蔡波. 循环载荷下突出煤样的变形和渗 透特性试验研究. 岩石力学与工程学报,2010,29( 增刊 2) : 3498) [11] Zhao H B,Wang J C. Experimental study of evolution law of me￾chanical properties of coal containing gas under unloading confi￾ning pressure. Rock Soil Mech,2011,32( Suppl 1) : 270 ( 赵洪宝,王家臣. 卸围压时含瓦斯煤力学性质演化规律试 验研究. 岩土力学,2011,32( 增刊 1) : 270) [12] Yin G Z,Li W P,Li M H,et al. Permeability properties and ef￾fective stress of raw coal under loading-unloading conditions. J China Coal Soc,2014,39( 8) : 1497 ( 尹光志,李文璞,李铭辉,等. 加卸载条件下原煤渗透率与 有效应力的规律. 煤炭学报,2014,39( 8) : 1497) [13] Zhu J,Jiang Y D,Zhao Y X,et al. Experimental study on per￾meability of coal samples under the simultaneous action of unloa￾ding and loading. J China Coal Soc,35( Suppl 1) : 76 ( 祝捷,姜耀东,赵毅鑫,等. 加卸荷同时作用下煤样渗透性 ·1679·
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