Grasselli节理峰值抗剪强度公式再探

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摘要确定节理峰值抗剪强度公式面临的首要问题是获取节理表面形貌并合理的评价其粗糙度。常用的方法是节理粗糙度系数(JRC)评价方法，但JRC的评价结果是基于二维剖面线获得的，该方法低估了节理面的粗糙度且具有较大的主观性。节理面形貌测试表明，节理面微元有效剪切倾角与≥ 的微元面积的总和与节理总面积的比值呈高次抛物线关系。基于42组不同形貌节理的直剪试验结果，将节理的峰值剪胀角与形貌参数相联系，提出新的能够考虑剪胀效应的节理峰值抗剪强度公式。新峰值抗剪强度公式符合莫尔–库仑摩擦定律的形式，具有明确的物理含义。所需要的参数均由节理面形貌测试确定，因此能够预测节理的峰值抗剪强度。最后，对已有的节理峰值抗剪强度公式进行比优统计分析并建议公式的使用范围。

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关键词 ：岩石力学, 节理, 三维形貌参数, 峰值抗剪强度

Abstract：The major problem in determining the shear strength of rock joints is how to measure and then express the joint roughness with a number or a mathematical function according to joint morphology. Joint roughness coefficient(JRC) is probably the most commonly used method to measure roughness of rock joint surfaces. The method of evaluating JRC of joint is by visual comparison of measured profiles against a set of standard JRC profiles produced by Barton and Choubey. However，JRC estimation by visual comparison is prone to subjectivity and based on the analysis of only a single profile in the direction of shearing and usually underestimates joint roughness. The right method should be based on three-dimensional topography of joint surface. During shear tests，it is observed that the common characteristic among all the contact areas is that they are located in the steepest zones facing the shear direction. There is a parabolic function relationship between the potential contact area and the apparent dip angle. This function is a manifestation of real three-dimensional joint surface morphology information. Based on 42 direct shear test results，the relationship between peak shear dilatancy angle and three-dimensional morphology parameters is presented，and then a new shear strength criterion is proposed. All the parameters are determined according to joint topography. The new criterion follows the standard form of Mohr-Coulomb formula and has a explicit physical meaning. Finally，priority between two shear strength criteria is analyzed and how to use the new criterion is also suggested.

Key words： rock mechanics joints three-dimensional surface parameters peak shear strength

收稿日期: 2011-08-12

引用本文:

唐志成1，2，夏才初1，2，宋英龙1，2，刘婷1，2. Grasselli节理峰值抗剪强度公式再探[J]. 岩石力学与工程学报, 2012, 31(2): 356-364.
TANG Zhicheng1，2，XIA Caichu1，2，SONG Yinglong1，2，LIU Ting1，2. DISCUSSION ABOUT GRASSELLI?S PEAK SHEAR STRENGTH CRITERION FOR ROCK JOINTS. , 2012, 31(2): 356-364.

链接本文:

http://www.rockmech.org/CN/Y2012/V31/I2/356

[7]	HSIUNG S M，GHOSH A，AHOLA M P，et al. Assessment of conventional methodologies for joint roughness coefficient determination[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1993，30(7)：825-829. " target="_blank">
[13]	KULATILAKE P H S W，SHOU G，HUANG T H，et al. New peak shear strength criteria for anisotropic rock joints[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1995，32(7)：673-697. " target="_blank">
[17]	BELEM T，HOMAND F，SOULEY M. Quantitative parameters for rock joint surface roughness[J]. Rock Mechanics and Rock Engineering，2000，33(4)：217-242.
[21]	COTTRELL B E. Updates to the GG-shear strength criterion[M. S. Thesis][D]. Toronto，Canada：University of Toronto，2009. " target="_blank">
[10]	ODLING N E. Natural fracture profiles，fractal dimension and joint roughness coefficients[J]. Rock Mechanics，1994，27(3)：135-153. " target="_blank">
[11]	REEVES M J. Rock surface roughness and frictional strength[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1985，22(6)：429-442. " target="_blank">
[15]	GENTIER S，RISS J，ARCHAMBAULT G，et al. Influence of fracture geometry on sheared behavior[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(1/2)：161-174. " target="_blank">
[18]	GRASSELLI G. Shear strength of rock joints based on quantified surface description[Ph. D. Thesis][D]. Switzerland：Swiss Federal Institute of Technology，2001. " target="_blank">
[19]	GRASSELLI G，WIRTH J，EGGER P. Quantitative three-dimensional description of a rough surface and parameter evolution with shearing[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(6)：789-800.
[22]	JING L. Numerical modeling of jointed rock masses by distinct element method for two- and three-dimensional problems[Ph. D. Thesis][D]. Lulea，Sweden：Lulea University of Technology，1990. " target="_blank">
[23]	ASADOLLAHI P. Stability analysis of a single three-dimensional rock block：effect of dilatancy and high-velocity water jet impact[Ph. D. Thesis][D]. Austin，USA：University of Texas at Austin，2009. " target="_blank">
[3]	BARTON N，CHOUBEY V. The shear strength of rock joints in theory and practice[J]. Rock Mechanics and Rock Engineering，1977，10(1/2)：1-54. " target="_blank">
[16]	HOMAND F，BELEM T，SOULEY M. Friction and degradation of rock joint surfaces under shear loads[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2001，25(10)：973-999. " target="_blank">
[20]	GRASSELLI G，EGGER P. Constitutive law for the shear strength of rock joints based on three-dimensional surface parameters[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(1)：25-40.
[1]	PATTON F D. Multiple modes of shear failure in rock[C]// Proceedings of the First Congress of International Society of Rock Mechanics. Lisbon，Portugal：[s.n.]，1966：509-513. " target="_blank">
[2]	LADANYI B，ARCHAMBAULT G. Simulation of the shear behavior of a jointed rock mass[C]// Proceedings of the 11th US Symposium on Rock Mechanics. Berkeley，US：[s.n.]，1970：105-125. " target="_blank">
[4]	AMADEI B，WIBOWO J，STURE S，et al. Applicability of existing models to predict the behavior of replicas of natural fractures of welded tuff under different boundary conditions[J]. Geotechnical and Geology Engineering，1998，16(1)：79-128. " target="_blank">
[5]	International Society for Rock Mechanics. Suggested methods for the quantitative description of discontinuities in rock masses[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1978，15(2)：319-368. " target="_blank">
[6]	BEER A J，STEAD D，COGGAN J S. Technical note estimation of the joint roughness coefficient(JRC) by visual comparison[J]. Rock Mechanics and Rock Engineering，2002，35(1)：65-74.
[8]	HUANG S L，OELFKE S M，SPECK R C. Applicability of fractal characterization and modeling to rock joint profiles[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1992，29(1)：89-98. " target="_blank">
[9]	XIE H P，WANG J A，KWASNIEWSKI M A. Multi-fractal characterization of rock fracture surfaces[J]. International Journal of Rock Mechanics and Mining Sciences，1999，36(1)：19-27. " target="_blank">
[12]	TSE R，CRUDEN D M. Estimating joint roughness coefficients[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1979，16(5)：303-307. " target="_blank">
[14]	HONG E S，LEE J S，LEE I M. Underestimation of roughness in rough rock joints[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2008，32(11)：1 385-1 403. " target="_blank">