高速公路改扩建对既有顺层边坡扰动可靠度分析
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摘要
对安徽省某沿江高速公路既有顺层边坡进行二次开挖改扩建时,需拆除既有边坡的支护结构,将导致原有已加固边坡的应力重新调整,极易诱发更危险的边坡失稳破坏,严重危害既有高速公路的运营安全。考虑解除原有边坡加固措施,抗剪强度参数c、φ值变异性对边坡稳定性的影响,建立了结合有限元强度折减法和点估计法的边坡可靠度分析方法,对原南沿江高速既有高边坡提出了预加固、后开挖的处治方式,并对不同工况进行了可靠度对比分析。结果表明:对既有边坡进行预加固处置后,开挖边坡的安全系数由直接开挖的1.008提高至1.207,而失稳破坏概率由48.01%降至11.49%,大大提高了边坡的稳定性,且具有较强的经济、环保、安全效应。
To reconstruct and expand the existing slope of an expressway along the Yangtze River in Anhui Province,it is necessary to dismantle the supporting structures of the slope,which will easily lead to the readjustment of the stress of the slope and induce a new slope failure.Considering the effects of removing the reinforcement measures of the existing slope and the variability of the shear strength parameters c andφon the slope stability,in this paper a slope reliability analysis method combining the finite element strength reduction method and the point estimate method is established.The idea of prereinforcement is put forward for the existing high slope,and the reliability of different conditions is compared and analyzed.The result proves that the safety factor of the excavation slope is increased from 1.008 to 1.207 and the failure probability is reduced from 48.01% to 11.49% after the pre-reinforcement of the existing slope,which greatly improves the stability of the slope,and the scheme has better economic,environmental and safety benefits.
To reconstruct and expand the existing slope of an expressway along the Yangtze River in Anhui Province,it is necessary to dismantle the supporting structures of the slope,which will easily lead to the readjustment of the stress of the slope and induce a new slope failure.Considering the effects of removing the reinforcement measures of the existing slope and the variability of the shear strength parameters c andφon the slope stability,in this paper a slope reliability analysis method combining the finite element strength reduction method and the point estimate method is established.The idea of prereinforcement is put forward for the existing high slope,and the reliability of different conditions is compared and analyzed.The result proves that the safety factor of the excavation slope is increased from 1.008 to 1.207 and the failure probability is reduced from 48.01% to 11.49% after the pre-reinforcement of the existing slope,which greatly improves the stability of the slope,and the scheme has better economic,environmental and safety benefits.
引文
[1]谭积青.改扩建高速公路桩锚支护边坡稳定性数值分析[J].中外公路,2013,33(3):34-36.
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[3]段跃华,何忠明,李健.基于FLAC3D的改扩建高速公路高边坡施工方案优选[J].公路工程,2014,39(3):60-64.
[4]柏俊磊,王乐华,汤开宇,等.开挖卸荷速率变化对岩质边坡应力应变影响作用研究[J].长江科学院院报,2014,31(6):60-64,68.
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[10]王德洋.基于可靠度理论的边坡稳定性研究进展[C]//中国地质学会工程地质专业委员会.2016年全国工程地质学术年会论文集,2016:9.
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[12]李典庆,周创兵,陈益峰,等.边坡可靠度分析的随机响应面法及程序实现[J].岩石力学与工程学报,2010,29(8):1513-1523.
[13]祝玉学.边坡可靠性分析[M].北京:冶金工业出版社,1993.
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[16]王刘洋.Rosenblueth法在土坡稳定可靠度分析中的应用[J].岩土工程技术,2005,(2):72-74.
[17]罗文强,龚珏.Rosenblueth方法在斜坡稳定性概率评价中的应用[J].岩石力学与工程学报,2003,(2):232-235.
[18]张亚国,张波,李萍,等.基于点估计法的黄土边坡可靠度研究[J].工程地质学报,2011,19(4):615-619.
[19]汪伟,申俊敏,赵建斌,等.基于强度折减法的黄土边坡可靠度分析[J].交通科技,2013,(6):43-45.
[20]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报,2002,(3):343-346.
[21]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,(10):57-61,78.
[22]Zheng Y R,Zhao S G,Zhang L Y.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62.
[23]郑颖人,赵尚毅.岩土工程极限分析有限元法及其应用[J].土木工程学报,2005,(1):91-98,104.
[2]罗根传,胡庆国,谭积青.基于极限平衡法与强度折减法的高边坡过程稳定性分析[J].矿冶工程,2013,33(2):14-17.
[3]段跃华,何忠明,李健.基于FLAC3D的改扩建高速公路高边坡施工方案优选[J].公路工程,2014,39(3):60-64.
[4]柏俊磊,王乐华,汤开宇,等.开挖卸荷速率变化对岩质边坡应力应变影响作用研究[J].长江科学院院报,2014,31(6):60-64,68.
[5]陈宾,张可能,周斌,等.道路改扩建膨胀土边坡工程过程稳定性分析及治理[J].矿冶工程,2010,30(3):23-26.
[6]王仲锦,吴敏敏,程爱君,等.铁路路堤边坡的可靠度设计方法研究[J].铁道工程学报,2013,30(3):24-27,49.
[7]唐亚明.基于可靠度的黄土斜坡稳定性分析[J].地质通报,2008,(8):1217-1222.
[8]蒋水华,李典庆.基于随机响应面法和Sarma法的边坡可靠度分析[J].铁道工程学报,2011,28(7):21-27,33.
[9]李杰.基于可靠度方法的既有铁路边坡稳定性分析[J].铁道工程学报,2014,(2):33-37.
[10]王德洋.基于可靠度理论的边坡稳定性研究进展[C]//中国地质学会工程地质专业委员会.2016年全国工程地质学术年会论文集,2016:9.
[11]Yen B C,Cheng S T,Melching C S.First-order reliability analysis.in:BC Yen ed.,Stochastic and Risk Analysis in Hydraulic Engineering[M].Water research publications,littleton,co,1986:1-36.
[12]李典庆,周创兵,陈益峰,等.边坡可靠度分析的随机响应面法及程序实现[J].岩石力学与工程学报,2010,29(8):1513-1523.
[13]祝玉学.边坡可靠性分析[M].北京:冶金工业出版社,1993.
[14]Rosenblueth E.Two-point estimates in probabilities[J].Appl.Math.,Modeling,1981,(5):329-335.
[15]Rosenblueth E.Point estimates for probability moments[J].Proc.natl.acad.sci.U.S.A.,1975,72(10):3812-3814.
[16]王刘洋.Rosenblueth法在土坡稳定可靠度分析中的应用[J].岩土工程技术,2005,(2):72-74.
[17]罗文强,龚珏.Rosenblueth方法在斜坡稳定性概率评价中的应用[J].岩石力学与工程学报,2003,(2):232-235.
[18]张亚国,张波,李萍,等.基于点估计法的黄土边坡可靠度研究[J].工程地质学报,2011,19(4):615-619.
[19]汪伟,申俊敏,赵建斌,等.基于强度折减法的黄土边坡可靠度分析[J].交通科技,2013,(6):43-45.
[20]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报,2002,(3):343-346.
[21]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,(10):57-61,78.
[22]Zheng Y R,Zhao S G,Zhang L Y.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62.
[23]郑颖人,赵尚毅.岩土工程极限分析有限元法及其应用[J].土木工程学报,2005,(1):91-98,104.