|
|
|
| SIZE EFFECT OF ROCK MESSES AND ASSOCIATED REPRESENTATIVE ELEMENT PROPERTIES |
| LIANG Zhengzhao1，2，ZHANG Yongbin2，TANG Shibin1，LI Lianchong2，TANG Chun?an2 |
| (1. State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian，Liaoning 116024，China；2. Center of Rock Instability and Seismicity Research，Dalian University of Technology，Dalian，Liaoning 116024，China) |
|
|
|
|
Abstract The rock size effect，including intact rock size effect and size effect of jointed rock mass，is a hot topic in rock mechanics and rock engineering. However，determining the parameters of intact rocks and the rock mass with randomly distributed joints is much difficult in numerical simulations. In this paper，it is assumed that the rock mass is composed of intact rock with joints. Based on physico-mechanical test and microscopic parameter statistical theory，a statistical model is built to study the intact rock scale effect. Based on the statistical analysis of macro joint distribution，a macroscopic rock mass model is put forward to investigate the rock mass scale effect. The main idea is described as follows：(1) A statistical model can be established by analyzing the data of the laboratory experimental tests of intact rocks. The representative element size and its strength can be obtained by studying the scale effect of the intact rocks. (2) By determining the mechanical parameters of the joints and the geometric distribution parameter of the joints，the numerical network model of joints can be established. (3) The rock mass model with different scales can be built to study the rock mass scale effect，and then，the representative element size and its strength can be calculated. By using the strength reduction FEM or centrifugal loading method，the stability of the rock engineering can be analyzed according to the mechanical parameters of the jointed rock mass. Finally，the influences of the heterogeneity，confining pressure and density of joints on rock size effect are discussed. With increase of heterogeneity，representative element volume of rock sample increases；with increase of confining pressure，the representative strength increases but the increase of representative element volume is not obvious；with increase of density of joints，the representative element volume and strength decrease. The results will be useful for understanding the rock mass scale effect and provide a helpful way to obtain the mechanical parameters of jointed rock mass.
|
|
Received: 11 January 2013
|
|
|
|
| [1] 尤明庆，邹友峰. 关于岩石非均质性与强度尺寸效应的讨论[J]. 岩石力学与工程学报，2000，19(3)： 391–395.(YOU Minqing，ZOU Youfeng. Discussion on heterogeneity of rock material and size effect on specimen strength[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(3)：391–395.(in Chinese))
[2] 刘宝琛，张寄生，杜奇中. 岩石抗压强度的尺寸效应[J]. 岩石力学与工程学报，1998，17(6)：611–614.(LIU Baochen，ZHANG Jisheng，DU Qizhong. A study of size effect for compression strength of rock[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(6)：611–614.(in Chinese)).
[3] 杨圣奇，苏承东，明平美，等. 岩石强度尺寸效应的研究方法和机制的研究[J]. 焦作工学院学报：自然科学版，2009，21(5)：324–326. (YANG Shengqi，SU Chengdong，MING Pingmei，et al. Study on the method and mechanism of size effect of rock strength[J]. Journal of Jiaozuo Institute of Technology：Natural Science，2009，21(5)：324–326.(in Chinese))
[4] 陈剑平，王 清，肖树芳. 岩体裂隙网络分数维计算机模拟[J]. 工程地质学报，1995，3(5)：80–85.(CHEN Jianping，WANG Qing，XIAO Shufang. Computer modelling of the fractal dimension of rock mass fracture network[J]. Journal of Engineering Geology，1995，3(5)：80–85.(in Chinese))
[5] 朱焕春，陈文理. 生成节理随机数的直接法[J]. 武汉水利电力大学学报，1997，30(2)：10–12.(ZHU Huanchun，CHEN Wenli. Direct method forming joint random number[J]. Journal of Wuhan University of Hydraulic and Electric Engineering，1997，30(2)：10–12.(in Chinese))
[6] 张红亮，王水林，李春光. 基于数值试验的节理岩体变形特性REV研究[J]. 岩石力学与工程学报，2008，27(增2)：3 643–3 648. (ZHANG Hongliang，WANG Shuilin，LI Chunguang. Research on representative elemental volume(REV) of deformation character of jointed rock mass based on numerical experiment[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(Supp.2)：3 643–3 648.(in Chinese))
[7] 周创兵，熊文林. 论岩体的渗透特性[J]. 工程地质学报，1996，4(2)：69–74.(ZHOU Chuangbing，XIONG Wenlin. On permeability characteristics of rock mass[J]. Journal of Engineering Geology，1996，4(2)：69–74.(in Chinese))
[8] 周创兵，於三大. 论岩体表征单元体积REV——岩体力学参数取值的一个基本问题[J]. 工程地质学报，1999，7(4)：332–337. (ZHOU Chuangbing，YU Sanda. Representative elementary volume REV—a fundamental problem for selecting the mechanical parameters of jointed rock masses[J]. Journal of Engineering Geology，1999，7(4)：332–336.(in Chinese))
[9] 汪远年，李世海. 断续节理岩体随机模型三维离散元数值模拟[J]. 岩石力学与工程学报，2004，23(11)：3 652–3 658.(WANG Yuannian，LI Shihai. Stochastic model and numerical simulation for discontinuous jointed rock mass using 3D DEM[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(11)：3 652–3 658.(in Chinese))
[10] 何满潮，薛廷河，彭延飞. 工程岩体力学参数确定方法的研究[J]. 岩石力学与工程学报，2001，20(2)：225–229.(HE Manchao，XUE Tinghe，PENG Yanfei. A new way of determining mechanical parameters of engineering rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(2)：225–229.(in Chinese))
[11] 朱道建，杨林德，蔡永昌. 柱状节理岩体各向异性特性及尺寸效应研究[J]. 岩石力学与工程学报，2009，28(7)：1 405–1 414.(ZHU Daojian，YANG Linde，CAI Yongchang. Research on anisotropic characteristics and size effect of columnar jointed rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(7)：1 405–1 414.(in Chinese))
[12] 李云林. 三峡工程坝基岩体力学参数选择分析[J]. 长江科学院院报，1996，13(3)：45–49.(LI Yunlin. Selection and analysis of mechanical parameters of dam foundation rockmass of Three Gorges Project[J]. Journal of Yangtze River Scientific Research Institute，1996，13(3)：45–49.(in Chinese))
[13] 周火明，盛 谦，邬爱清. 三峡工程永久船闸边坡岩体宏观力学参数的尺寸效应研究[J]. 岩石力学与工程学报，2001，20(5)：661–664.(ZHOU Huoming，SHENG Qian，WU Aiqing. Size effect analysis on macro-mechanics parameters for the rock masses of the TGP ship lock slope[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(5)：661–664.(in Chinese))
[14] WEIBULL W. The phenomenon of rupture of solids [M]. Stockholm：I. V. A. Proc.，1939：17.
[15] 山口梅太郎，西松裕一. 岩石力学基础[M]. 北京：冶金工业出版社，1982：104–105.(YAMAGUCHI Meitailang，NISHIMATSU Yuichi. Basic principle of rock mechanics[M]. Beijing：Metallurgical Industry Press，1982：104–105.(in Chinese))
[16] 武汉水利电力学院. 土力学及岩石力学[M]. 北京：水利出版社，1982：360.(Wuhan Institute of Hydraulic and Electric Engineering. Soil mechanics and rock mechanics[M]. Beijing：Water Conservancy Press，1982：360.(in Chinese))
[17] BEAR J. Dynamics of fluids in porous media [M]. New York：Elsevier，1972：119–186.
[18] KULATILAKE P H S W. Estimating elastic constants and strength of discontinuous rock[J]. Journal of Geotechnical Engineering，1985，111(10)：847–864.
[19] 杨学堂，哈秋聆，张永兴，等. 裂隙岩体宏观力学参数数值仿真模拟研究[J]. 水力发电，2004，30(7)：43–49.(YANG Xuetang，HA Qiuling，ZHANG Yongxing，et al. Study on numerical simulation of macro mechanic parameters of fissured rock mass[J]. Water Power，2004，30(7)：43–49.(in Chinese))
[20] 张占荣，盛 谦，杨艳霜，等. 基于现场试验的岩体变形模量尺寸效应研究[J]. 岩土力学，2010，31(9)：2 875–2 881.(ZHANG Zhanrong， SHENG Qian，YANG Yanshuang，et al. Study of size effect of rock mass deformation modulus based on in-situ test[J]. Rock and Soil Mechanics，2010，31(9)：2 875–2 881.(in Chinese))
[21] 吕兆兴，冯增朝，赵阳升. 岩石的非均质性对其材料强度尺寸效应的影响[J]. 煤炭学报，2007，32(9)：917–920.(LU Zhaoxing，FENG Zengchao，ZHAO Yangsheng. Influence of rock in homogeneity on strength-size effect of rock materials[J]. Journal of China Coal Society，2007，32(9)：917–920.(in Chinese)) |
|
|
|
2013, Vol. 32 
