地震作用下黑方台黄土滑坡稳定性分析及治理措施
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摘要
以甘肃省永靖县黑方台黄土滑坡为依托,对黄土滑坡的分布特征和形成因素进行了分析,得出降雨入渗和灌溉是滑坡最主要的滑动原因.对地震作用下滑坡的稳定性采用了强度折减法和简化毕肖普法进行了分析计算.计算结果表明:该滑坡在采取工程加固措施整治前,在地震作用下处于不稳定状态,需进行整治,结合工程地质条件,提出采用排水和抗滑桩的整治方案,并计算得出在地震作用下整治后的滑坡安全稳定系数大于设计值.研究结论可为地震作用下黄土滑坡的稳定性分析提供参考和理论依据.
The distribution features and the direct and remote causes are analyzed for the earthequake-induced loess landslides in Heifangtai,Yongjing County,Gansu,China.Agricultural irrigation and natural precipitation are considered to be the major causes.A stability analysis is performed by using two pseudo-static methods: finite-element-based strength reduction method and simplified Bishop method.Through the analysis it is concluded that the loess landslides are in an unstable condition under seismic load before treatment and corresponding saftety evaluation and treatment should be implemented to reinforce the landslide without any delay.It is indicated that the reinforced landslides have a safety factor which is greater than the allowable safety factor under seismic load.The results can be references for similar landslide treatment.
The distribution features and the direct and remote causes are analyzed for the earthequake-induced loess landslides in Heifangtai,Yongjing County,Gansu,China.Agricultural irrigation and natural precipitation are considered to be the major causes.A stability analysis is performed by using two pseudo-static methods: finite-element-based strength reduction method and simplified Bishop method.Through the analysis it is concluded that the loess landslides are in an unstable condition under seismic load before treatment and corresponding saftety evaluation and treatment should be implemented to reinforce the landslide without any delay.It is indicated that the reinforced landslides have a safety factor which is greater than the allowable safety factor under seismic load.The results can be references for similar landslide treatment.
引文
[1]刘汉龙,薄景山,刘德东.岩土边坡地震稳定性分析研究评述[J].地震工程与工程振动,2005,25(1):164-171.
[2]GB50011-2001建筑抗震设计规范[S].
[3]Newmark NM.Effects of Earthquakes on Dams andEmbankments[J].Geotechnique,1965,15(2):139-160.
[4]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556.
[5]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,2002,24(3):343-346.
[6]郑颖人,赵尚毅,肖佑昆.用有限元强度折减法分析具有非贯通结构面岩质边坡稳定性[J].地质与勘探,2003,39(8):12-16.
[7]董玉文,任青文.屈服准则对边坡稳定有限元分析的影响研究[J].水电能源科学,2009,27(1):137-139.
[8]李垠,苏凯,李杰.Mohr-Coulomb等面积圆屈服准则在边坡稳定分析中的应用[J].大地测量与地球动力学,2009,29(1):135-139.
[9]田振刚.有限元强度折减法在边坡计算中失稳判据的讨论[J].公路交通技术,2009,4(11):29-31.
[10]许淑珍,董鹏.纵环向注浆联合支护技术在滑坡体黄土隧道中的应用[J].铁道标准设计,2011(2):103-106.
[11]李惠青.金斗山滑坡治理施工方案[J].铁道标准设计,2009(12):20-23.
[12]王念秦.黄土滑坡发育规律及其防治措施研究[D].成都理工大学博士论文,2004.
[2]GB50011-2001建筑抗震设计规范[S].
[3]Newmark NM.Effects of Earthquakes on Dams andEmbankments[J].Geotechnique,1965,15(2):139-160.
[4]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556.
[5]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,2002,24(3):343-346.
[6]郑颖人,赵尚毅,肖佑昆.用有限元强度折减法分析具有非贯通结构面岩质边坡稳定性[J].地质与勘探,2003,39(8):12-16.
[7]董玉文,任青文.屈服准则对边坡稳定有限元分析的影响研究[J].水电能源科学,2009,27(1):137-139.
[8]李垠,苏凯,李杰.Mohr-Coulomb等面积圆屈服准则在边坡稳定分析中的应用[J].大地测量与地球动力学,2009,29(1):135-139.
[9]田振刚.有限元强度折减法在边坡计算中失稳判据的讨论[J].公路交通技术,2009,4(11):29-31.
[10]许淑珍,董鹏.纵环向注浆联合支护技术在滑坡体黄土隧道中的应用[J].铁道标准设计,2011(2):103-106.
[11]李惠青.金斗山滑坡治理施工方案[J].铁道标准设计,2009(12):20-23.
[12]王念秦.黄土滑坡发育规律及其防治措施研究[D].成都理工大学博士论文,2004.
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