基于JRC-JCS模型的人工劈裂砂岩结构面力学特性研究
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摘要
为探究人工劈裂结构面与天然结构面力学特性的相似性,解决现场取样困难、难以保证均一性等问题,文章采用人工劈裂方式制备砂岩结构面,并进行三维扫描和室内直剪试验等,根据结构面相关理论、Barton标准剖面线等理论知识,描述了人工劈裂砂岩结构面的相关形态并确定了结构面粗糙度系数,最后基于JRC-JCS模型进行力学参数的估算,并与直剪试验结果对比,分析人工劈裂砂岩结构面的力学特性。结果表明:在粗糙度系数相同时,结构面的抗剪强度与所受的法向应力成正相关;在法向应力相同时,结构面抗剪强度与粗糙度系数成正相关;砂岩结构面的黏聚力和内摩擦角与粗糙度系数呈正相关,其相关系数与粗糙度系数呈负相关,结构面粗糙度系数越小,相关系数越接近于1。研究成果为结构面室内研究工作奠定了基础。
In order to explore the similarity between the mechanical properties of artificial split structural plane and natural structural plane,and to solve the difficulties of sampling in the field and ensuring uniformity and so on,the sandstone structural plane was prepared by artificial splitting,and the3 Dscanning and the indoor direct shear test were carried out.According to the relevant theory of structural plane,Barton standard profile and other theoretical knowledge,the related morphology of the artificial split sandstone structural plane was described and the roughness coefficient of the structural plane was determined.Finally,the mechanical parameters were estimated based on the JRC-JCS model,and the mechanical properties of the artificial split sandstone structural plane were analyzed and compared with the results of the direct shear test.The results show that when the roughness coefficient is the same,the shear strength of the structural plane is positively correlated with the normal stress,and the shear strength of the plane is positively correlated with the roughness coefficient when the normal stress is the same.The cohesion and the angle of internal friction of sandstone structural plane are positively correlated with the roughness coefficient;the correlation coefficient is negatively correlated with the roughness coefficient;the smaller the roughness coefficient of structural plane is,the closer the correlation coefficient is to 1.The research results lay a foundation for the indoor re-search of structural plane.
In order to explore the similarity between the mechanical properties of artificial split structural plane and natural structural plane,and to solve the difficulties of sampling in the field and ensuring uniformity and so on,the sandstone structural plane was prepared by artificial splitting,and the3 Dscanning and the indoor direct shear test were carried out.According to the relevant theory of structural plane,Barton standard profile and other theoretical knowledge,the related morphology of the artificial split sandstone structural plane was described and the roughness coefficient of the structural plane was determined.Finally,the mechanical parameters were estimated based on the JRC-JCS model,and the mechanical properties of the artificial split sandstone structural plane were analyzed and compared with the results of the direct shear test.The results show that when the roughness coefficient is the same,the shear strength of the structural plane is positively correlated with the normal stress,and the shear strength of the plane is positively correlated with the roughness coefficient when the normal stress is the same.The cohesion and the angle of internal friction of sandstone structural plane are positively correlated with the roughness coefficient;the correlation coefficient is negatively correlated with the roughness coefficient;the smaller the roughness coefficient of structural plane is,the closer the correlation coefficient is to 1.The research results lay a foundation for the indoor re-search of structural plane.
引文
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[11]张雅慧,汪丁建,唐辉明,等.基于PFC2D数值试验的异性结构面剪切强度特性研究[J].岩土力学,2016,37(4):1031-1041.
[12]郑光,许强.JRC-JCS模型在某边坡抗剪强度取值中的应用[J].山西建筑,2008(6):15-17.
[13]游志诚,王亮清,杨艳霞,等.基于三维激光扫描技术的结构面抗剪强度参数各向异性研究[J].岩石力学与工程学报,2014,33(增刊1):3003-3008.
[14] CHOI S O,CHUNG S K.Stability analysis of jointed rock slopes with the Barton constitutive model in UDEC[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(Suppl 1):581-586.
[15] FOTOOHI K,MTTRI H S.Non-linear fault behaviour near underground excavations:a boundary element approach[J].International Journal for Numerical and Analytical Methods in Geomechanics,1998,20(3):173-190.
[2] AYDAN O,SHIMZU Y,KAWAMOTO T.A portable system for in-situ characterization of surface morphology and frictional properties of rock discontinuities[C]//Proceedings of 4th International Symposium on Filed Measurements in Geomechanics(FAGM95),Bergamo,Italy.[S.l.:s.n.],1995:463-470.
[3] TANG H M,GE Y F,WANG L Q,et al.Study on estimation method of rock mass discontinuity shear strengh based on three-dimensional scanning and image technique[J].Journal of Earth Science,2012,23(6):908-913.
[4]葛云峰,唐辉明,黄磊,等.岩体结构面三维粗糙度系数表征新方法[J].岩石力学与工程学报,2012,31(12):2508-2517.
[5] BARTON N,CHOUBEY V.The shear strength of rock joints in theory and practice[J].Rock Mechanics and Rock Engineering,1977,10(1):1-54.
[6] TSE R,CRUDEN D M.Estimating joint roughness coeffcients[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Absbracts,1979,16(2):303-307.
[7]葛云峰.基于BAP的岩体结构面的粗糙度与峰值抗剪强度研究[D].武汉:中国地质大学(武汉),2014.
[8]张庆,郑光,许强,等.携剪实验和JRC-JCS模型在结构面抗剪强度取值中的应用[J].地质灾害与环境保护,2011(1):103-107.
[9]杜时贵,胡晓飞,郭霄,等.JRC-JCS模型与直剪试验对比研究[J].岩石力学与工程学报,2008,27(增刊1):2747-2753.
[10]王智德,夏元友,夏国邦,等.顺层岩质边坡结构面抗剪强度特性试验研究[J].岩土力学,2015,36(增刊2):193-200.
[11]张雅慧,汪丁建,唐辉明,等.基于PFC2D数值试验的异性结构面剪切强度特性研究[J].岩土力学,2016,37(4):1031-1041.
[12]郑光,许强.JRC-JCS模型在某边坡抗剪强度取值中的应用[J].山西建筑,2008(6):15-17.
[13]游志诚,王亮清,杨艳霞,等.基于三维激光扫描技术的结构面抗剪强度参数各向异性研究[J].岩石力学与工程学报,2014,33(增刊1):3003-3008.
[14] CHOI S O,CHUNG S K.Stability analysis of jointed rock slopes with the Barton constitutive model in UDEC[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(Suppl 1):581-586.
[15] FOTOOHI K,MTTRI H S.Non-linear fault behaviour near underground excavations:a boundary element approach[J].International Journal for Numerical and Analytical Methods in Geomechanics,1998,20(3):173-190.