顺层岩体路堑边坡稳定性的弹塑性有限元模拟分析
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摘要
基于理想弹塑性本构模型和Drucker-Prager准则,运用岩体力学理论、有限元数值模拟技术和强度折减原理,对顺层岩体路堑边坡在开挖过程中不同阶段的应力、变形、结构面上的摩擦力和边坡的稳定性等问题进行了模拟分析。分析表明,顺层岩体路堑边坡的应力场、位移场、结构面的接触状况以及边坡的稳定性明显受开挖效应的影响;在每一阶段的开挖面上,坡脚附近的水平位移量最大,最危险接触面也都集中在开挖形成的坡脚处,此处岩石最先脱落破坏;边坡的稳定性安全系数也随着开挖阶段的深入而逐渐降低。
Based on perfectly elastoplastic constitutive model and Drucker-Prager yield criterion,the rock mechanics theory,the numerical simulation technique of FEM and the strength reduction principle are used to simulate and analyze the stress,displacement,friction on contact surface and the stability of bedding rock cutting slope in different excavated stages.The analysis indicates that the stress field,displacement field,contact status and stability of the bedding rock cutting slope are obviously influenced by excavating effect.On each excavated face,the horizontal displacement near the slope toe is the biggest;the most dangerous contact surface focuses on the excavated slope toe where the abscission destruction firstly occurs.Also,the safety factor of the slope gets lower gradually as the slope is excavated deeper.
Based on perfectly elastoplastic constitutive model and Drucker-Prager yield criterion,the rock mechanics theory,the numerical simulation technique of FEM and the strength reduction principle are used to simulate and analyze the stress,displacement,friction on contact surface and the stability of bedding rock cutting slope in different excavated stages.The analysis indicates that the stress field,displacement field,contact status and stability of the bedding rock cutting slope are obviously influenced by excavating effect.On each excavated face,the horizontal displacement near the slope toe is the biggest;the most dangerous contact surface focuses on the excavated slope toe where the abscission destruction firstly occurs.Also,the safety factor of the slope gets lower gradually as the slope is excavated deeper.
引文
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[2]张年学,盛祝平,孙广忠,等.长江三峡工程库区顺层岸坡研究[M].北京:地震出版社,1993.
[3]李树森,任光明,左三胜.层状结构岩体顺层斜坡失稳机理的力学分析[J].地质灾害与环境保护,1995,6(2):24-29.LI Shu-sen,REN Guang-min,ZUO San-sheng.Mech-anical analysis of instability mechanism of consequent slope in bedded rockmass[J].Journal of Geological Hazards and Environment Preservation,1995,6(2):24-29.
[4]晏鄂川,唐辉明,何淼.路堑边坡工程的动态仿真分析[J].岩土力学,2004,25(2):246-250.YAN E-chuan,TANG Hui-ming,HE Miao.Real-time simulation for slope engineering of highway[J].Rock and Soil Mechanics,2004,25(2):246-250.
[5]赵尚毅,时为民,郑颖人.边坡稳定分析的有限元法[J].地下空间,2001,21(5):450-454.ZHAO Shang-yi,SHI Wei-min,ZHENG Yin-ren.FEM for analysis of slope stability[J].Underground Space,2001,21(5):450-454.
[6]周翠英,刘祚秋,董立国,等.边坡变形破坏过程的大变形有限元分析[J].岩土力学,2003,24(4):644-652.ZHOU Cui-ying,LIU Zuo-qiu,DONG LI-guo,et al.Large deformation finite element analysis of slopes failure[J].Rock and Soil Mechanics,2003,24(4):644-652.
[7]赵尚毅,郑颖人,时卫明,等.用有限元强度折减法求边坡稳定的安全系数[J].岩土工程学报,2002,24(3):343-346.ZHAO Shang-yi,ZHENG Yin-ren,SHI Wei-ming,et al.Analysis of safety factor of slope by strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2002,24(3):343-346.
[8]晏鄂川,唐辉明.工程岩体稳定性评价与利用[M].武汉:中国地质大学出版社,2002.
[9]黄润秋,许强.开挖过程的非线性理论分析[J].工程地质学报,1999,7(1):9-14.HUANG Run-qiu,XU Qiang.Nonlinear theory analysis of rockmass movement in excavation[J].Journal of Engineering Geology,1999,7(1):9-14.
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