基于强度折减法的库岸滑坡三维有限元分析
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摘要
通过现场踏勘调研,根据滑坡的环境地质条件,详细探讨了该库岸滑坡的成因机制和演化过程,并重点分析了滑坡失稳的影响因素。建立滑坡体的三维有限元模型,运用有限元强度折减理论对其稳定性进行了计算分析。结果表明,滑坡体在天然状况下是稳定的,库水位上升至正常蓄水位时将超过滑坡前缘高程,滑坡安全系数降低,不满足规范规定的最小安全系数的要求,在考虑降雨入渗、库水位骤降时,滑坡进一步趋于危险;在考虑蓄水+地震工况时,库岸滑坡有失稳的可能。据此提出了削坡减载治理措施,治理后滑坡在各工况下的安全系数均满足规范的要求,研究成果对滑坡的治理具有较大的参考价值。
The genetic mechanism and evolvement process of the reservoir bank landslide were discussed detailedly based on engineering exploration and analyzing environmental geological conditions.And some main factors effecting stability of the landslide were analyzed emphatically.Through building a 3D FEM model of landslide,the stable situations of the landslide under various situations were considered based on the strength reduction method.The result shows that the landslide is steady under the natural situation.The front edge of the landslide will be drowned out when the reservoir retains water normally;the safety factor reduces and can’t meet the requirements of norms.The landslide tends to be more dangerous under rainfall infiltration and rapid drawdown of the reservoir water level.And the landslide will be instable when water storage situation and earthquake situation were considered at the same time.According to the preceding analysis,the treatment measures of cutting slope and reducing load were presented.The landslide is steady under various conditions after being controlled.The relevant conclusions and methods proposed take a good effect in landslide treatment.
The genetic mechanism and evolvement process of the reservoir bank landslide were discussed detailedly based on engineering exploration and analyzing environmental geological conditions.And some main factors effecting stability of the landslide were analyzed emphatically.Through building a 3D FEM model of landslide,the stable situations of the landslide under various situations were considered based on the strength reduction method.The result shows that the landslide is steady under the natural situation.The front edge of the landslide will be drowned out when the reservoir retains water normally;the safety factor reduces and can’t meet the requirements of norms.The landslide tends to be more dangerous under rainfall infiltration and rapid drawdown of the reservoir water level.And the landslide will be instable when water storage situation and earthquake situation were considered at the same time.According to the preceding analysis,the treatment measures of cutting slope and reducing load were presented.The landslide is steady under various conditions after being controlled.The relevant conclusions and methods proposed take a good effect in landslide treatment.
引文
[1]孙杰,贾建业,詹文欢.广东某滑坡特征及稳定性评价[J].水土保持研究,2007,14(5):37-39.SUN Jie,JIA Jian-ye,ZHAN Wen-huan.Features and the stability evaluation for a landslide in Guangdong[J].Research of Soil and Water Conservation,2007,14(5):37-39.
[2]王明华,晏鄂川.水库蓄水对库岸滑坡的影响研究[J].岩土力学,2007,28(12):2722-2725.WANG Ming-hua,YAN E-chuan.Study on influence of reservoir water impounding on reservoir landslide[J].Rock and Soil Mechanics,2007,28(12):2722-2725.
[3]李宏杰,戴福初,杨军.某滑坡蓄水后的三维稳定性数值分析[J].水文地质工程地质,2007,27(6):59-62.LI Hong-jie,DAI Fu-chu,YANG Jun.Stability assessment of a landslide after impoundment by using 3D numerical analysis[J].Hydrogeology and Engineering Geology,2007,27(6):59-62.
[4]李建林,王乐华,邓华锋,等.铅厂滑坡及坝基开挖边坡稳定研究报告[R].湖北宜昌:三峡大学,2007.
[5]赵尚毅,郑颖人,时卫民.用有限元强度折减法求边坡稳定性安全系数[J].岩土工程学报,2002,24(3):344-346.ZHAO Shang-yi,ZHENG Ying-ren,SHI Wei-min.Analysis of safety factor of slope by strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2002,24(3):344-346.
[6]郑颖人.岩土材料屈服与破坏及边(滑)坡稳定分析方法研讨[J].岩石力学与工程学报,2007,26(4):649-660.ZHENG Ying-ren.Discussion on yield and failure of geometries and stability analysis methods of slope/landslide[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(4):649-660.
[7]MANZARI M T,NOUR M A.Significance of soil dilatancy in slope stability analysis[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2000,126(1):75-80.
[8]刘金龙,栾茂田,赵少飞.关于强度折减有限元方法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345-1348.LIU Jin-long,LUAN Mao-tian,ZHAO Shao-fei.Discussion on criteria for evaluating stability of slope in elastoplastic FEM based on shear strength reduction technique[J].Rock and Soil Mechanics,2005,26(8):1345-1348.
[9]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座——Ⅱ有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.ZHAO Shang-yi,ZHENG Ying-ren,ZHANG Yu-fang.Study on slope failure criterion in strength reduction finite element method[J].Rock and Soil Mechanics,2005,26(2):332-336.
[10]连镇营,韩国城,孔宪京.强度折减有限元法研究开挖边坡的稳定性[J].岩土工程学报,2001,23(4):407-411.LIAN Zhen-ying,HAN Guo-cheng,KONG Xian-Jing.Stability analysis of excavation by strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2001,23(4):407-411.
[11]王乐华,温世亿,邓华锋.某水电站铅厂滑坡滑带参数取值研究[J].水科学与工程技术,2009,(3):46-48.WANG Le-hua,WEN Shi-yi,DENG Hua-feng.Study on values of landslide group parameters about Qianchang in a hydropower station[J].Water Sciences and Eng-ineering Technology,2009,(3):46-48.
[12]中华人民共和国国家经济贸易委员会.DL5180-2003水电枢纽工程等级划分及设计安全标准[S].北京:中国电力出版社,2007.
[13]魏作安,尹光志,张东明.滑坡灾害的动态综合治理方法及其应用[J].矿业工程,2002,22(4):18-20.WEI Zuo-an,YIN Guang-zhi,ZHANG Dong-min.Dynamical comprehensive control method for landslide disaster and its application at open pit mines[J].Mining and Metallurgical Engineering,2002,22(4):18-20.
[2]王明华,晏鄂川.水库蓄水对库岸滑坡的影响研究[J].岩土力学,2007,28(12):2722-2725.WANG Ming-hua,YAN E-chuan.Study on influence of reservoir water impounding on reservoir landslide[J].Rock and Soil Mechanics,2007,28(12):2722-2725.
[3]李宏杰,戴福初,杨军.某滑坡蓄水后的三维稳定性数值分析[J].水文地质工程地质,2007,27(6):59-62.LI Hong-jie,DAI Fu-chu,YANG Jun.Stability assessment of a landslide after impoundment by using 3D numerical analysis[J].Hydrogeology and Engineering Geology,2007,27(6):59-62.
[4]李建林,王乐华,邓华锋,等.铅厂滑坡及坝基开挖边坡稳定研究报告[R].湖北宜昌:三峡大学,2007.
[5]赵尚毅,郑颖人,时卫民.用有限元强度折减法求边坡稳定性安全系数[J].岩土工程学报,2002,24(3):344-346.ZHAO Shang-yi,ZHENG Ying-ren,SHI Wei-min.Analysis of safety factor of slope by strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2002,24(3):344-346.
[6]郑颖人.岩土材料屈服与破坏及边(滑)坡稳定分析方法研讨[J].岩石力学与工程学报,2007,26(4):649-660.ZHENG Ying-ren.Discussion on yield and failure of geometries and stability analysis methods of slope/landslide[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(4):649-660.
[7]MANZARI M T,NOUR M A.Significance of soil dilatancy in slope stability analysis[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2000,126(1):75-80.
[8]刘金龙,栾茂田,赵少飞.关于强度折减有限元方法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345-1348.LIU Jin-long,LUAN Mao-tian,ZHAO Shao-fei.Discussion on criteria for evaluating stability of slope in elastoplastic FEM based on shear strength reduction technique[J].Rock and Soil Mechanics,2005,26(8):1345-1348.
[9]赵尚毅,郑颖人,张玉芳.极限分析有限元法讲座——Ⅱ有限元强度折减法中边坡失稳的判据探讨[J].岩土力学,2005,26(2):332-336.ZHAO Shang-yi,ZHENG Ying-ren,ZHANG Yu-fang.Study on slope failure criterion in strength reduction finite element method[J].Rock and Soil Mechanics,2005,26(2):332-336.
[10]连镇营,韩国城,孔宪京.强度折减有限元法研究开挖边坡的稳定性[J].岩土工程学报,2001,23(4):407-411.LIAN Zhen-ying,HAN Guo-cheng,KONG Xian-Jing.Stability analysis of excavation by strength reduction FEM[J].Chinese Journal of Geotechnical Engineering,2001,23(4):407-411.
[11]王乐华,温世亿,邓华锋.某水电站铅厂滑坡滑带参数取值研究[J].水科学与工程技术,2009,(3):46-48.WANG Le-hua,WEN Shi-yi,DENG Hua-feng.Study on values of landslide group parameters about Qianchang in a hydropower station[J].Water Sciences and Eng-ineering Technology,2009,(3):46-48.
[12]中华人民共和国国家经济贸易委员会.DL5180-2003水电枢纽工程等级划分及设计安全标准[S].北京:中国电力出版社,2007.
[13]魏作安,尹光志,张东明.滑坡灾害的动态综合治理方法及其应用[J].矿业工程,2002,22(4):18-20.WEI Zuo-an,YIN Guang-zhi,ZHANG Dong-min.Dynamical comprehensive control method for landslide disaster and its application at open pit mines[J].Mining and Metallurgical Engineering,2002,22(4):18-20.
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