基于三维裂隙网络的RQD尺寸效应与空间效应的研究

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摘要岩石质量指标(RQD)是岩土工程与地质工程中的重要概念，在岩体性质分析中起到了重要作用，但RQD存在着明显的尺寸效应与空间效应，这在以后岩体工程设计计算中并没有引起充分的重视。为研究RQD的空间效应，采用三维裂隙网络模拟方法模拟现场真实岩体，并在模型中设立大量测线获取岩体中不同位置的RQD值。结果表明，岩体中不同位置的RQD值并不相同，存在明显的空间效应。为获取可整体代表岩体好坏程度的RQD值，需在大量RQD样本的基础上进行分析。另外，为更好地体现岩体的非均质性，研究不同阈值下的RQD范围，最终确定可充分反映待分析岩体的最佳阈值，为4 m。尺寸效应是RQD参数的重要性质，通过改变测线长度的方法探讨RQD在不同尺度下的变化情况。总结、提出RQD的计算模型与公式，即：A-A模型、T-T模型、A-A-S模型、Priest-Hudson公式与Senz-Kazi公式。分别研究与对比不同模型下RQD的尺寸效应，结果表明，采用A-A-S模型可充分减少尺寸效应带来的RQD的计算误差；当阈值较大时，Priest-Hudson公式与Senz-Kazi公式存在一定的误差，基于三维裂隙网络模拟的方法进行RQD的计算将会更为准确。

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关键词 ：岩石力学, 岩体, 岩石质量指标(RQD), 空间效应, 尺寸效应

Abstract：Rock quality designation(RQD)，which plays an significant role in the rock mass analysis，is an important parameter in geotechnical and geological engineering. However，the size effect and spatial effect have not been comprehensively considered. To investigate the spatial effect of RQD，three-dimensional(3D) fracture network modelling is used to simulate the actual rock mass，and numerous scan-lines are set to obtain RQD values. The result shows that the RQD values vary in different regions and have obvious spatial effect. To obtain the characteristics of RQD that could represent the whole rock mass quality，the analysis based on plenty of RQD samples should be conducted. In addition，to better reflect the inhomogeneity feature of rock mass，RQD ranges of different thresholds are studied；and the optimal threshold of 4 m that can comprehensively reflect the inhomogeneity feature of the investigated rock mass is determined. The size effect is an important feature of RQD. To investigate the feature，the RQD variation is researched by changing the scan-line length. The models and equations(i.e. A-A model，T-T model，A-A-S model，Priest-Hudson equation，and Senz-Kazi equation) are proposed and summarized. The size effects of different models are studied. The results show that：the error of size effect can be decreased using A-A-S model；when the threshold is relative large，the results by Priest-Hudson equation and Senz-Kazi equation have errors；and the RQD value based on 3D fracture network is more correct.

Key words： rock mechanics rock mass rock quality designation(RQD) spatial effect size effect

引用本文:

张文1，陈剑平1，苑晓青1，马骏骅2. 基于三维裂隙网络的RQD尺寸效应与空间效应的研究[J]. 岩石力学与工程学报, 2012, 31(7): 1437-1445.
ZHANG Wen1，CHEN Jianping1，YUAN Xiaoqing1，MA Junhua2. STUDY OF SIZE EFFECT AND SPATIAL EFFECT OF RQD FOR ROCK MASSES BASED ON THREE-DIMENSIONAL FRACTURE NETWORK. , 2012, 31(7): 1437-1445.

链接本文:

http://www.rockmech.org/CN/Y2012/V31/I7/1437

[3]	SENZ Z，KAZI A. Discontinuity spacing and RQD estimates from finite length scanlines[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1984，21(4)：203-212. " target="_blank">
[4]	CHOI S Y，PARK H D. Variation of rock quality designation(RQD) with scanline orientation and length：a case study in Korea[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(2)：207-221.
[5]	VLASTOS S，LIU E，MAIN I G，et al. Numerical simulation of wave propagation in media with discrete distributions of fractures：effects of fracture sizes and spatial distributions[J]. Geophysical Journal International，2003，152(3)：649-668. " target="_blank">
[8]	ZHANG W，WANG Q，CHEN J P，et al. Determination of the optimal threshold and length measurements for RQD calculations[J]. International Journal of Rock Mechanics and Mining Sciences，2012，51(1)：1-12. " target="_blank">
[12]	陈剑平，石丙飞，王清. 工程岩体随机结构面优势方向的表示法初探[J]. 岩石力学与工程学报，2005，24(2)：241-245.(CHEN Jianping，SHI Bingfei，WANG Qing. Study on the dominant orientations of random fractures of fractured rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(2)：241-245.(in Chinese))
[14]	PHSW K，WU T H. Estimation of mean trace length of discontinuities[J]. Rock Mechanics and Rock Engineering，1984，17(4)：215-232. " target="_blank">
[15]	PHSW K，WU T H. Sampling bias on orientation of discontinuities[J]. Rock Mechanics and Rock Engineering，1984，17(4)：243-253. " target="_blank">
[6]	陈剑平，肖树芳，王清. 随机不连续面三维网络计算机模拟原理[M]. 长春：东北师范大学出版社，1995：9-17.(CHEN Jianping，XIAO Shufang，WANG Qing. Three-dimensional network modeling of stochastic fractures[M]. Changchun：Northeast Normal University Press，1995：9-17.(in Chinese)) " target="_blank">
[9]	HARRISON J P. Selection of the threshold value in RQD assessments[J]. International Journal of Rock Mechanics and Mining Sciences，1999，36(5)：673-685. " target="_blank">
[17]	NIIBORI Y，NAKATA R，TOCHIYAMA O. Evaluation of solute transport through a fracture by considering the spatial distributions of retardation effect in grain scale[J]. Journal of Hydrologic Engineering，2009，14(11)：1 214-1 220 " target="_blank">
[1]	DEERE D U. Technical description of rock cores for engineering purposes[J]. Rock Mechanics and Engineering Geology，1963，1(1)：18-22. " target="_blank">
[11]	PRIEST S D. Discontinuity analysis for rock engineering[M]. London：Chapman and Hall，1993：129-149. " target="_blank">
[2]	PRIEST S D，HUDSON J A. Discontinuity spacing in rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1976，13(5)：135-148. " target="_blank">
[13]	PHSW K. Estimating elastic constants and strength of discontinuous rock[J]. Journal of Geotechnical Engineering，1985，111(7)：847-864. " target="_blank">
[16]	侯哲生，韩文峰，李晓. 金川二矿区巷道围岩力学参数空间效应数值分析II[J]. 岩石力学与工程学报，2004，23(1)：64-68.(HOU Zhesheng，HAN Wenfeng，LI Xiao. Numerical analysis of spatial effect of mechanical parameter of surrounding rocks in Jinchuan deposit[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(1)：64-68.(in Chinese))
[7]	王国欣，肖树芳，陈剑平. 不连续面三维网络在RQD中的应用研究[J]. 岩石力学与工程学报，2002，21(12)：1 761-1 764.(WANG Guoxin，XIAO Shufang，CHEN Jianping. Study on application of 3D network of discontinuities to RQD[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(12)：1 761-1 764.(in Chinese)) " target="_blank">
[10]	杜时贵，王思敬. 岩石质量指标(RQD)的各向异性分析[J]. 工程地质学报，1996，4(4)：48-54.(DU Shigui，WANG Sijing. Simple analysis of anisotropy of rock quality designation[J]. Journal of Engineering Geology，1996，4(4)：48-54.(in Chinese))