均质土坡抗震稳定安全度拟静力分析方法探讨
|
摘要
利用拟静力法进行边坡抗震稳定分析时,地震荷载按照现行《水电水利工程边坡设计规范》(DL/T5353-2006)中建议,采用土石坝地震加速度动态分布系数图确定。但是由于边坡为单面凌空,因而动力特性和土石坝有明显不同。本文采用有限元结合反应谱法对具有相同高度的边坡和土石坝进行动力反应分析,结果表明边坡的加速度放大系数和土石坝有很大的不同,采用规范中规定的土石坝的动态分布系数是不合理的,进而提出了边坡的地震加速度动态分布系数的建议线,并以此确定地震荷载。同时采用算例证明了建议线的合理性。
If a pseudo-static method is used to analyze the aseismic stability of homogeneous soil slope of an earth-rock dam,according to The codes of engineered slopes in water resources and hydropower projects(DL/T5353-2006),calculation of earthquake load relies on the figure of seismic coefficient.The slopes with a single free surface,however,have different dynamic features from the ones of earth-rock dam.In this work,finite element method and response spectrum method were adopted to analyze the seismic acceleration distribution of soil slope.The results show that seismic coefficient of soil slope is much different from that of earth-rock.To avoid the errors in using such a seismic coefficient,new figure of seismic coefficient is put forward for calculation of soil slope under earthquake load.Application of this figure in a numerical example shows the efficiency and reliability of the proposed method.
If a pseudo-static method is used to analyze the aseismic stability of homogeneous soil slope of an earth-rock dam,according to The codes of engineered slopes in water resources and hydropower projects(DL/T5353-2006),calculation of earthquake load relies on the figure of seismic coefficient.The slopes with a single free surface,however,have different dynamic features from the ones of earth-rock dam.In this work,finite element method and response spectrum method were adopted to analyze the seismic acceleration distribution of soil slope.The results show that seismic coefficient of soil slope is much different from that of earth-rock.To avoid the errors in using such a seismic coefficient,new figure of seismic coefficient is put forward for calculation of soil slope under earthquake load.Application of this figure in a numerical example shows the efficiency and reliability of the proposed method.
引文
[1]中华人民共和国电力行业标准.DL/T5353-2006水电水利工程边坡设计规范[S].北京:中国电力出版社,2007.
[2]孔宪京,刘君,韩国城,等.混凝土面板堆石坝地震反应分析的剪切梁法[J].水利学报,2000,(7):55～60.KONG Xianjing,LIU Jun,HAN Guocheng,et al.Shear wedge beam method of seismic response analysis for concrete faced rockfilldams(CFRDs)[J].Journal of Hydraulic Engineering,2007,(7):55～60.
[3]顾淦臣,沈长松,岑威钧,土石坝地震工程学[M].北京:中国水利水电出版社,2009.GU Gancheng,SHEN Changsong,CEN Weijun.Earthquake Engineering for Earthrock Dams[M].Beijing:China Water PowerPress,2009.(in Chinese)
[4]张锐,迟世春,林泉,高土石坝地震加速度分布研究[J].哈尔滨工业大学学报,2008,40(8):1289～1291.ZHANG Rui,CHI Shichun,LIN Gao,Analysis of seismic acceleration distribution of high earth and rochfill dam[J].Journal ofHarbin Institute of Technology,2008,40(8):1289～1291.
[5]中华人民共和国电力行业标准,DL5073-2000水工建筑物抗震设计规[S].北京:中国水利水电出版社,2000.
[6]何蕴龙,陆述远.岩石边坡地震作用近似计算方法[J].岩土工程学报,1998,20(2):66～68.HE Yunlong,LU Shuyuan.A method for calculating the scismic action in rock slope[J].Chinese Journal of GeotechnicalEngineering,1998,20(2):66～68.
[7]刘金龙,栾茂田,赵少飞,等.关于强度折减有限元法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345～1348.LIU Jinglong,LUAN Maotian,ZHAO Shaofei,et al.Discussion on criteria for evaluating stability of slope in elastoplastic FEMbased on shear strength reducation technique[J].Rock and Soil Mechanics,2005,26(8):1345～1348.
[2]孔宪京,刘君,韩国城,等.混凝土面板堆石坝地震反应分析的剪切梁法[J].水利学报,2000,(7):55～60.KONG Xianjing,LIU Jun,HAN Guocheng,et al.Shear wedge beam method of seismic response analysis for concrete faced rockfilldams(CFRDs)[J].Journal of Hydraulic Engineering,2007,(7):55～60.
[3]顾淦臣,沈长松,岑威钧,土石坝地震工程学[M].北京:中国水利水电出版社,2009.GU Gancheng,SHEN Changsong,CEN Weijun.Earthquake Engineering for Earthrock Dams[M].Beijing:China Water PowerPress,2009.(in Chinese)
[4]张锐,迟世春,林泉,高土石坝地震加速度分布研究[J].哈尔滨工业大学学报,2008,40(8):1289～1291.ZHANG Rui,CHI Shichun,LIN Gao,Analysis of seismic acceleration distribution of high earth and rochfill dam[J].Journal ofHarbin Institute of Technology,2008,40(8):1289～1291.
[5]中华人民共和国电力行业标准,DL5073-2000水工建筑物抗震设计规[S].北京:中国水利水电出版社,2000.
[6]何蕴龙,陆述远.岩石边坡地震作用近似计算方法[J].岩土工程学报,1998,20(2):66～68.HE Yunlong,LU Shuyuan.A method for calculating the scismic action in rock slope[J].Chinese Journal of GeotechnicalEngineering,1998,20(2):66～68.
[7]刘金龙,栾茂田,赵少飞,等.关于强度折减有限元法中边坡失稳判据的讨论[J].岩土力学,2005,26(8):1345～1348.LIU Jinglong,LUAN Maotian,ZHAO Shaofei,et al.Discussion on criteria for evaluating stability of slope in elastoplastic FEMbased on shear strength reducation technique[J].Rock and Soil Mechanics,2005,26(8):1345～1348.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心