地震作用下桩锚组合结构加固边坡稳定性分析
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摘要
对于一些性质复杂,滑坡推力巨大的边(滑)坡,单一的抗滑结构对其整治已显得无能为力,于是各种组合抗滑结构应运而生,然而目前对采用组合防治结构加固边坡稳定性的研究又十分稀缺。因此,以桩锚组合结构加固边坡为例,运用极限分析上限定理,推导出了地震作用下桩锚组合结构加固边坡中抗滑桩所需提供抗力的计算公式以及该加固边坡的屈服加速度计算公式,并提出了永久位移的预测方法,为地震带边坡防治结构的设计提供理论依据。通过对桩锚组合结构加固的实例边坡的计算分析,得到了在确定的锚索布置条件下,抗滑桩所需提供抗力和边坡屈服加速度与地震系数、抗滑桩布置位置、边坡特性和坡体材料特性等因素相关关系的一系列研究结果,揭示了地震作用下桩锚组合结构加固边坡的稳定性。
An example of slope reinforced with pile and anchor composite structure was used to study the stability under the seismic loading.Calculations were conducted by applying the limit analysis upper bound method.Analyt-ical expressions were derived that enable to readily calculate the reinforcement force of pile required to prevent fail-ure and the yield acceleration of slopes subjected to earthquake loading.Moreover,a suitable procedure based on the assessment of earthquake-induced permanent displacement was proposed for designing reinforced slopes in seis-mically active areas.From the example,the influence of seismic forces on slope stability was obtained.
An example of slope reinforced with pile and anchor composite structure was used to study the stability under the seismic loading.Calculations were conducted by applying the limit analysis upper bound method.Analyt-ical expressions were derived that enable to readily calculate the reinforcement force of pile required to prevent fail-ure and the yield acceleration of slopes subjected to earthquake loading.Moreover,a suitable procedure based on the assessment of earthquake-induced permanent displacement was proposed for designing reinforced slopes in seis-mically active areas.From the example,the influence of seismic forces on slope stability was obtained.
引文
[1]Zhang X J,Chen W F.Stability analysis of slopes with gen-eral nonlinear failure criterion[J].Int J Numer Anal MethGeomech 1987(11):33-50.
[2]Yu H S,Salgado R,Sloan S W,et al.Limit analysis versuslimit equilibrium for slope stability[J].Journal of Geotech-nical and Geoenvironmental Engineering,ASCE,1998,124(1):1-11.
[3]Yang Xiaoli,Li Liang,Li Kekun.Beating capacity analysis ofsubgrade soil using upper bound finite element method[J].Journal of Changsha Railway University2,002,20(1):41-45.[杨小礼,李亮,李克坤.上限有限元法及其在路堤稳定性分析中的应用[J].长沙铁道学院学报,2002,20(1):41-45.]
[4]Yang X L,Li L,Yin J H.Seismic and static stability anal-ysis of rock slopes by a kinematical approach[J].Geotech-nique,2004,54:543-9.
[5]Ausilio E,Conte E,Duente G.Stability analysis of reinforcedslopes[J].Soil Dynamics and Earthquake Engineering,2000(19):159-172.
[6]Ausilio E,Conte E,Duente G.Stability analysis of slopes re-inforced with piles[J].Computers and Geotechnics,2001,28:591-611.
[7]Kokusho T,Ishizawa T.Energy approach for earthquake in-duces slope failure evaluation[J].Soil Dynamics and Earth-quake Engineering,2006,26:221-230.
[8]Kokusho TI,shizawa T.Energy approach to earthquake-in-duces slope failure and its implications[J].Journal ofGeotechnical and Geoenvironmental Engineering,2007,133(7):828-840.
[9]陈惠发.极限分析与土体塑性[M].北京:人民交通出版社,1995.
[10]Xong Bin.The motion mechanism of viscous debris[D].Beijing:Tsinghua University,1996.[熊斌.黏性泥石流运动机理[D].北京:清华大学,1996.]
[11]Xiao Li Yang.Seismic displacement of rock slopes withnonlinear hoek-Brown failure criterion[J].InternationalJournal of Rock Mechanics&Mining Sciences,2007,44:948-953.
[2]Yu H S,Salgado R,Sloan S W,et al.Limit analysis versuslimit equilibrium for slope stability[J].Journal of Geotech-nical and Geoenvironmental Engineering,ASCE,1998,124(1):1-11.
[3]Yang Xiaoli,Li Liang,Li Kekun.Beating capacity analysis ofsubgrade soil using upper bound finite element method[J].Journal of Changsha Railway University2,002,20(1):41-45.[杨小礼,李亮,李克坤.上限有限元法及其在路堤稳定性分析中的应用[J].长沙铁道学院学报,2002,20(1):41-45.]
[4]Yang X L,Li L,Yin J H.Seismic and static stability anal-ysis of rock slopes by a kinematical approach[J].Geotech-nique,2004,54:543-9.
[5]Ausilio E,Conte E,Duente G.Stability analysis of reinforcedslopes[J].Soil Dynamics and Earthquake Engineering,2000(19):159-172.
[6]Ausilio E,Conte E,Duente G.Stability analysis of slopes re-inforced with piles[J].Computers and Geotechnics,2001,28:591-611.
[7]Kokusho T,Ishizawa T.Energy approach for earthquake in-duces slope failure evaluation[J].Soil Dynamics and Earth-quake Engineering,2006,26:221-230.
[8]Kokusho TI,shizawa T.Energy approach to earthquake-in-duces slope failure and its implications[J].Journal ofGeotechnical and Geoenvironmental Engineering,2007,133(7):828-840.
[9]陈惠发.极限分析与土体塑性[M].北京:人民交通出版社,1995.
[10]Xong Bin.The motion mechanism of viscous debris[D].Beijing:Tsinghua University,1996.[熊斌.黏性泥石流运动机理[D].北京:清华大学,1996.]
[11]Xiao Li Yang.Seismic displacement of rock slopes withnonlinear hoek-Brown failure criterion[J].InternationalJournal of Rock Mechanics&Mining Sciences,2007,44:948-953.
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