上覆土层节理岩质边坡稳定性数值分析
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摘要
采用Mohr-Coulomb和Ubiquitous-Joint本构模型,运用强度折减法,研究节理面倾向与倾角、土层与岩层的厚度比例对上覆土层节理岩质边坡稳定性的影响。结果表明:节理面顺倾角度大小与岩体中岩石的内摩擦角接近时,坡体稳定性较差,破坏区域较大;节理面反倾角度与坡体潜在破坏裂隙近似正交时,坡体稳定性较好;随着坡角的增大,节理面倾角变化对坡体稳定性的影响逐渐减弱;当节理面倾角大于坡角时,边坡角度是影响坡体稳定性的主要因素;上覆土层厚度小于4m时,安全系数随土层厚度的增加而增大,土层厚度大于4m时,安全系数随土层厚度的增加而减小;上层土体的厚度较小时,应重点对坡脚处进行支护;上层土体厚度接近或超过坡高一半时,应重点对上层土体临空侧进行支护。
The influence of the dip and inclination of joint and the ratio of soil thickness to rock thickness on the stability of jointed rock slope with overlying soil is researched in the present paper. The Mohr-Coulomb and Ubiquitous-Joint constitutive models and strength reduction method are used. Results of numerical simulation reveal that:for consequent-joint slope,when the consequent angle of joint is approximately equal to the internal friction angle of the rock,the safety factor is small and the damage area is large; while for anti-dip rock slope,the safety factor is large when the joint intersects vertically with the potential damage fracture of the slope. The effect of the dip of joint on slope stability reduces with the slope angle increasing. When the dip of joint is larger than the slope angle,slope angle is the main factor affecting the slope stability. When the thickness of soil layer is less than 4 meters,the slope safety factor increases with the thickness of soil layer increasing,and vise versa. When the thickness of the overlying soil is small,the slope toe should be the focus of support work,while the air side of the overlying soil should be supported as the key position when the thickness of the overlying soil is close to or larger than half of the slope height.
The influence of the dip and inclination of joint and the ratio of soil thickness to rock thickness on the stability of jointed rock slope with overlying soil is researched in the present paper. The Mohr-Coulomb and Ubiquitous-Joint constitutive models and strength reduction method are used. Results of numerical simulation reveal that:for consequent-joint slope,when the consequent angle of joint is approximately equal to the internal friction angle of the rock,the safety factor is small and the damage area is large; while for anti-dip rock slope,the safety factor is large when the joint intersects vertically with the potential damage fracture of the slope. The effect of the dip of joint on slope stability reduces with the slope angle increasing. When the dip of joint is larger than the slope angle,slope angle is the main factor affecting the slope stability. When the thickness of soil layer is less than 4 meters,the slope safety factor increases with the thickness of soil layer increasing,and vise versa. When the thickness of the overlying soil is small,the slope toe should be the focus of support work,while the air side of the overlying soil should be supported as the key position when the thickness of the overlying soil is close to or larger than half of the slope height.
引文
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[13]Itasca Consulting Group,Inc.Fast Language Analysis of Continuain 3 Dimensions,Version 3.0,User’s Manual[K].Minneapolis,MN USA:Itasca Consulting Group,Inc,2005.
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[2]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版社,2010:146-193.(ZHENG Ying-ren,CHEN Zu-yu,WANG Gong-xian,et al.Engineering Treatment of Slope&Landslide[M].Beijing:China Communication Press,2010:146-193.(in Chinese))
[3]白云峰,周德培,冯君.顺向坡岩层走向与边坡走向夹角的上限值[J].西南交通大学学报,2005,40(3):326-329.(BAI Yun-feng,ZHOU De-pei,FENG Jun.Upper Limit of Angle between Strikes of Slope and Strata for Dip Slope[J].Journal of Southwest Jiaotong University,2005,40(3):326-329.(in Chinese))
[4]陈从新,黄平路,卢增木.岩层倾角影响顺层岩石边坡稳定性的模型试验研究[J].岩土力学,2007,28(3):476-481.(CHEN Cong-xin,HUANG Ping-lu,LU Zeng-mu.Study on Correlation between Stability of Consequent Rock Slope and Obliquity of Rock Layer by Simulation Experiment[J].Rock and Soil Mechanics,2007,28(3):476-481.(in Chinese))
[5]龚文惠,王平,陈峰.顺层岩质路堑边坡稳定性的敏感性因素分析[J].岩土力学,2007,28(4):812-816.(GONG Wen-hui,WANG Ping,CHEN Feng.Analysis of Sensitivity Factors to Stability of Bedding Rock Cutting Slope[J].Rock and Soil Mechanics,2007,28(4):812-816.(in Chinese))
[6]蔡跃,三谷泰浩,江琦哲郎.反倾层状岩体边坡稳定性的数值分析[J].岩石力学与工程学报,2008,27(12):2517-2522.(CAI Yue,MITANI Y,ESAKI T.Numerical Analysis of Stability for an Antidip Stratified Rock Slope[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(12):2517-2522.(in Chinese))
[7]LU G Y,ZHU Z Q,LIU Q Y,et al.Failure Mode and Strength Anisotropic Characteristic of Stratified Rock Mass under Uniaxial Compressive Situation[J].Journal of Central South University,2009,16(4):663-668.
[8]林杭,曹平,李江腾,等.层状岩质边坡破坏模式及稳定性的数值分析[J].岩土力学,2010,31(10):3300-3304.(LIN Hang,CAO Ping,LI Jiang-teng,et al.Numerical Analysis of Failure Modes and Stability of Stratified Rock Slopes[J].Rock and Soil Mechanics,2010,31(10):3300-3304.(in Chinese))
[9]柳群义.红层路堑边坡稳定性与防治研究[D].长沙:中南大学,2010:54-65.(LIU Qun-yi.Study on the Stability of Road Slope with Red Bedded Rock Mass and Its Reinforcement Technique[D].Changsha:Central South University,2010:54-65.(in Chinese))
[10]卢敦华,曲艳伟,何忠明,等.结构面强度参数对层状边坡稳定性影响的三维分析[J].中南大学学报(自然科学版),2011,42(1):147-151.(LU Dun-hua,QU Yan-wei,HE Zhong-ming,et al.Three-dimensional Analysis for Effect of Structural Plane Strength Parameters on Stratified Slope Stability[J].Journal of Central South University(Science and Technology),2011,42(1):147-151.(in Chinese))
[11]黄书岭,徐劲松,丁秀丽,等.考虑结构面特性的层状岩体复合材料模型与应用研究[J].岩石力学与工程学报,2010,29(4):743-756.(HUANG Shu-ling,XU Jin-song,DING Xiu-li,et al.Study of Layered Rock Mass Composite Model Based on Characteristics of Structural Plane and Its Application[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(4):743-756.(in Chinese))
[12]赵炼恒,罗强,李亮,等.层状岩体边坡动态稳定性拟静力上限分析[J].岩土力学,2010,31(11):3627-3634.(ZHAO Lian-heng,LUO Qiang,LI Liang,et al.Upper Bound Quasi-static Analysis of Dynamic Stability of Layered Rock Slopes[J].Rock and Soil Mechanics,2010,31(11):3627-3634.(in Chinese))
[13]Itasca Consulting Group,Inc.Fast Language Analysis of Continuain 3 Dimensions,Version 3.0,User’s Manual[K].Minneapolis,MN USA:Itasca Consulting Group,Inc,2005.
[14]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,2011:160-168.(CHEN Zhong-yi,ZHOU Jing-xing,WANG Hong-jin.Soil Mechanics[M].Beijing:Tsinghua University Press,2011:160-168.(in Chinese))
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