不同因素影响下高边坡稳定性评价及防护措施
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摘要
探讨了降雨和地震作用下高边坡稳定性受影响机理。以典型工程实例为背景,借助有限元软件,建立较为精细的有限元模型,利用静力强度折减法与动力时程法计算得到不同外部条件作用对高边坡稳定性的影响,而后基于分析结果制定防护措施。结果表明:降雨与地震均对边坡稳定性产生了显著影响,安全系数较自重作用分别降低12.3%与25.2%。塑性区的贯通是边坡破坏的必要条件,而非充分条件。高岩质边坡通过微型桩加固后,安全系数提高了33.8%,说明该类防护措施可以有效控制边坡滑动。
This paper discussed the mechanism of how rainfall and seismic actions influence stability of high slope. Depending on typical engineering project and finite element software,the fine finite element model was established,through which the effects of different external conditions on high slope stability were obtained by means of static strength reduction and dynamic time history analysis,and then the related protection measures were specified. The result shows that both rainfall and earthquake have significant effect on stability of high slope with the safety factor,comparing to that under the action of gravity,reduced by 12. 3 % and 25. 2 %,respectively. The cut-through of plastic zone is not the sufficient condition,but the necessary condition of slope failure. High rock slope has safety factor increased by 33. 8 % after reinforced by micro-piles,showing such protection measures may control slope sliding effectively.
This paper discussed the mechanism of how rainfall and seismic actions influence stability of high slope. Depending on typical engineering project and finite element software,the fine finite element model was established,through which the effects of different external conditions on high slope stability were obtained by means of static strength reduction and dynamic time history analysis,and then the related protection measures were specified. The result shows that both rainfall and earthquake have significant effect on stability of high slope with the safety factor,comparing to that under the action of gravity,reduced by 12. 3 % and 25. 2 %,respectively. The cut-through of plastic zone is not the sufficient condition,but the necessary condition of slope failure. High rock slope has safety factor increased by 33. 8 % after reinforced by micro-piles,showing such protection measures may control slope sliding effectively.
引文
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[4]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,29(8):1714-1723.Zheng Y R,Ye H L,Huang R Q.Analysis and discussion of failure mechanism and fracture surface of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009,29(8):1714-1723.
[5]文畅平,杨果林.基于属性数学理论的岩土边坡地震稳定性评价[J].中国铁道科学,2010,31(5):8-14.Wen C P,Yang G L.The seismic stability evaluation of the rock and soil slope based on the attribute mathematical theory[J].China Railway Science,2010,31(5):8-14.
[6]Bishop A W,Blight G E.Some aspects of effective stress in saturated and unsaturated soils[J].Géotechnique,1963,13(3):177-197.
[7]Fredlund D G,Morgenstern N R,Widger R A.The shear strength of unsaturated soils[J].Canadian Geotechnical Journal,1978,15(3):313-321.
[8]Yang C S,Mo H H,Chen J S,et al.Influence of seismic loading on segment opening of a shield tunnel[J].The Scientific World Journal,2014,3:1-8.
[2]Reichenberger V,Jakobs H,Bastian P,et al.A mixed-dimensional finite volume method for two-phase flow in fractured porous media[J].Advances in Water Resources,2006,29(7):1020-1036.
[3]刘洋,李世海,刘晓宇.基于连续介质离散元的双重介质渗流应力耦合模型[J].岩石力学与工程学报,2011,30(5):951-959.Liu Y,Li S H,Liu X Y.Coupled fluid flow and stress computation model of dual media based on continuum-medium distinct element method[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(5):951-959.
[4]郑颖人,叶海林,黄润秋.地震边坡破坏机制及其破裂面的分析探讨[J].岩石力学与工程学报,2009,29(8):1714-1723.Zheng Y R,Ye H L,Huang R Q.Analysis and discussion of failure mechanism and fracture surface of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009,29(8):1714-1723.
[5]文畅平,杨果林.基于属性数学理论的岩土边坡地震稳定性评价[J].中国铁道科学,2010,31(5):8-14.Wen C P,Yang G L.The seismic stability evaluation of the rock and soil slope based on the attribute mathematical theory[J].China Railway Science,2010,31(5):8-14.
[6]Bishop A W,Blight G E.Some aspects of effective stress in saturated and unsaturated soils[J].Géotechnique,1963,13(3):177-197.
[7]Fredlund D G,Morgenstern N R,Widger R A.The shear strength of unsaturated soils[J].Canadian Geotechnical Journal,1978,15(3):313-321.
[8]Yang C S,Mo H H,Chen J S,et al.Influence of seismic loading on segment opening of a shield tunnel[J].The Scientific World Journal,2014,3:1-8.
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