复杂节理岩体的剪切强度特性的尺寸影响研究
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摘要
基于三维块体离散元软件3DEC程序,考虑存在三组节理的复杂节理岩体的情况,通过对10个不同尺寸的岩体块体进行直剪试验模拟,探讨岩体尺寸对于剪切强度特性的影响效果。由于剪切面相对节理面位置的不同,块体分为两组(第Ⅰ、Ⅱ组),得出了法向应力作用下的剪切应力与水平位移的关系曲线图。通过计算可得出剪切强度参数——黏聚力和摩擦角及其与块体尺寸的关系曲线。由此可见,两组的差异较大,故在进行选择参数时应根据剪切面的位置分别进行考虑。最后对岩体的剪切强度特性的尺寸效应进行了理论分析,认为节理岩体的剪切强度特性的尺寸影响的关键原因是节理结构面的存在,节理的相对位置、组数、间距、材料属性等都是重要的影响因素。
Shear strength characteristics of rock is one of the indicators of rock mechanical properties,thus the study of size effect has been a subject of particular concern of scholars,so the impact study of the size to jointed rock mass shear strength characteristics emerged. Based on three-dimensional block discrete element software program 3DEC,considering the case of the presence of three sets joints of jointed rock mass,through direct shear test simulation of rock blocks of different sizes,explore the effect of dimension to shear strength characteristics. Due to the different positions of the shear plane,blocks are divided into two groups( Group Ⅰ、Ⅱ),a graph of shear stress and horizontal displacement under the action of normal stress was acquired. It can be derived by calculating the shear strength parameters — cohesion and friction angle,and the curves with the rock size. It shows large differences between the two groups,therefore,it should be considered separately when selecting these parameters,and theoretically analyze rock size effect to shear strength propriety. The key reasons for shear strength of jointed rock mass affected by size is the presence of joint structural planes,besides the relative position of joints,the number of joint groups,spacing,material properties etc. are all important influence factors.
Shear strength characteristics of rock is one of the indicators of rock mechanical properties,thus the study of size effect has been a subject of particular concern of scholars,so the impact study of the size to jointed rock mass shear strength characteristics emerged. Based on three-dimensional block discrete element software program 3DEC,considering the case of the presence of three sets joints of jointed rock mass,through direct shear test simulation of rock blocks of different sizes,explore the effect of dimension to shear strength characteristics. Due to the different positions of the shear plane,blocks are divided into two groups( Group Ⅰ、Ⅱ),a graph of shear stress and horizontal displacement under the action of normal stress was acquired. It can be derived by calculating the shear strength parameters — cohesion and friction angle,and the curves with the rock size. It shows large differences between the two groups,therefore,it should be considered separately when selecting these parameters,and theoretically analyze rock size effect to shear strength propriety. The key reasons for shear strength of jointed rock mass affected by size is the presence of joint structural planes,besides the relative position of joints,the number of joint groups,spacing,material properties etc. are all important influence factors.
引文
[1]田永生,张盛,李广强.宏观、细观和微观相结合的材料性质研究[J].水利与建筑工程学报,2008,6(1):111-114.
[2]Bear J.Dynamics of Fluids in Porous Media[M].New York:American Elsevier,1972.
[3]Long J C S,Remer J S,Wilson C R,et al.Porous media equivalents for networks of discontinuous fractures[J].Water Resources Research,1982,18(3):645-658.
[4]Oda M.A method for evaluating the representative elementary volume based on joint survey of rock masses[J].Canadian Geotechnical Journal,1988,25(3):440-447.
[5]刘顺桂,池永翔,王思敬,等.柱状节理玄武岩体抗剪强度参数尺寸效应研究[J].工程地质学报,2009,17(3):367-370.
[6]周创兵,陈益峰,姜清辉.岩体表征单元体与岩体力学参数[J].岩土工程学报,2007,29(8):1135-1142.
[7]张贵科.节理岩体正交各向异性等效力学参数与屈服准则研究及其工程应用[D].南京:河海大学,2006.
[8]唐辉明,张宜虎,孙云志.岩体等效变形参数研究[J].地球科学,2007,32(3):389-396.
[9]杨建平,陈卫忠,戴永浩.裂隙岩体变形模量尺寸效应研究II:解析法[J].岩土力学,2011,32(6):1607-1612.
[10]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):332-336.
[11]Kulatilake P H S W.Estimating elastic constants and strength of discontinuous rock[J].Journal of Geotechnical Engineering,1985,111(7):847-864.
[12]朱万成,张敏思,张洪训,等.节理岩体表征单元体尺寸确定的数值模拟[J].岩土工程学报,2013,35(6):1121-1127.
[13]向文飞.裂隙岩体表征单元体及力学特性尺寸效应研究[D].武汉:武汉大学,2005.
[14]唐辉明,张宜虎,孙云志.岩体等效变形参数研究[J].地球科学:中国地质大学学报,2007,32(3):389-396.
[15]杨建平,陈卫忠,戴永浩.裂隙岩体变形模量尺寸效应研究I:有限元法[J].岩土力学,2011,32(5):1538-1545.
[16]Min K B,Jing L.Numerical determination of the equivalent elastic compliance tensor for fractured rock masses using the distinct element method[J].International Journal of Rock Mechanics and Mining Sciences,2003,40(6):795-816.
[17]Min K B,Jing L.Stress dependent mechanical properties and bounds of Poisson's ratio for fractured rock masses investigated by a DFN-DEM technique[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(3):1-6.
[18]闫东旭,徐卫亚,王伟,等.柱状节理岩体宏观等效弹性模量尺寸效应研究[J].岩土工程学报,2012,34(2):243-250.
[19]宁宇,徐卫亚,郑文棠,等.柱状节理岩体随机模拟及其表征单元体尺度研究[J].岩石力学与工程学报,2008,27(6):1202-1208.
[20]马超锋,李晓,介玉新,等.围压对节理岩体表征单元体尺寸的影响研究[J].岩石力学与工程学报,2011,30(S2):3928-3936.
[21]卢波,葛修润,朱东林,等.节理岩体表征单元体的分形几何研究[J].岩石力学与工程学报,2005,24(8):1355-1361.
[22]王一然,钟山,高轩麟,等.基于工程岩体内摩擦系数等效模型数值试验[J].水利与建筑工程学报,2014,12(4):84-87.
[2]Bear J.Dynamics of Fluids in Porous Media[M].New York:American Elsevier,1972.
[3]Long J C S,Remer J S,Wilson C R,et al.Porous media equivalents for networks of discontinuous fractures[J].Water Resources Research,1982,18(3):645-658.
[4]Oda M.A method for evaluating the representative elementary volume based on joint survey of rock masses[J].Canadian Geotechnical Journal,1988,25(3):440-447.
[5]刘顺桂,池永翔,王思敬,等.柱状节理玄武岩体抗剪强度参数尺寸效应研究[J].工程地质学报,2009,17(3):367-370.
[6]周创兵,陈益峰,姜清辉.岩体表征单元体与岩体力学参数[J].岩土工程学报,2007,29(8):1135-1142.
[7]张贵科.节理岩体正交各向异性等效力学参数与屈服准则研究及其工程应用[D].南京:河海大学,2006.
[8]唐辉明,张宜虎,孙云志.岩体等效变形参数研究[J].地球科学,2007,32(3):389-396.
[9]杨建平,陈卫忠,戴永浩.裂隙岩体变形模量尺寸效应研究II:解析法[J].岩土力学,2011,32(6):1607-1612.
[10]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):332-336.
[11]Kulatilake P H S W.Estimating elastic constants and strength of discontinuous rock[J].Journal of Geotechnical Engineering,1985,111(7):847-864.
[12]朱万成,张敏思,张洪训,等.节理岩体表征单元体尺寸确定的数值模拟[J].岩土工程学报,2013,35(6):1121-1127.
[13]向文飞.裂隙岩体表征单元体及力学特性尺寸效应研究[D].武汉:武汉大学,2005.
[14]唐辉明,张宜虎,孙云志.岩体等效变形参数研究[J].地球科学:中国地质大学学报,2007,32(3):389-396.
[15]杨建平,陈卫忠,戴永浩.裂隙岩体变形模量尺寸效应研究I:有限元法[J].岩土力学,2011,32(5):1538-1545.
[16]Min K B,Jing L.Numerical determination of the equivalent elastic compliance tensor for fractured rock masses using the distinct element method[J].International Journal of Rock Mechanics and Mining Sciences,2003,40(6):795-816.
[17]Min K B,Jing L.Stress dependent mechanical properties and bounds of Poisson's ratio for fractured rock masses investigated by a DFN-DEM technique[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(3):1-6.
[18]闫东旭,徐卫亚,王伟,等.柱状节理岩体宏观等效弹性模量尺寸效应研究[J].岩土工程学报,2012,34(2):243-250.
[19]宁宇,徐卫亚,郑文棠,等.柱状节理岩体随机模拟及其表征单元体尺度研究[J].岩石力学与工程学报,2008,27(6):1202-1208.
[20]马超锋,李晓,介玉新,等.围压对节理岩体表征单元体尺寸的影响研究[J].岩石力学与工程学报,2011,30(S2):3928-3936.
[21]卢波,葛修润,朱东林,等.节理岩体表征单元体的分形几何研究[J].岩石力学与工程学报,2005,24(8):1355-1361.
[22]王一然,钟山,高轩麟,等.基于工程岩体内摩擦系数等效模型数值试验[J].水利与建筑工程学报,2014,12(4):84-87.