地震荷载作用下顺层岩质边坡安全系数分析
|
摘要
结合强度折减法的思想,并考虑到地震荷载特征以及离散元法和顺层岩质边坡的特点,提出一种求解地震荷载作用下顺层岩质边坡安全系数的方法。采用关键点位移/速度时程曲线的变化趋势对边坡的临界状态进行判断,采用失稳状态时坡体的速度/位移矢量图来判断与安全系数对应的滑动面。将上述方法运用到钟家湾顺层边坡的稳定分析中,并将所得结果与极限平衡法计算结果进行对比,发现二者的计算数值相差较小,对比结果表明该方法是合理可行的。在此基础上,利用UDEC初步分析地震荷载作用下坡高、坡度、岩层倾角以及地震波参数包括振幅、频率等因素对顺层岩质边坡安全系数的影响规律。
Based on the strength reduction method,a new method to determine the factor of safety of bedding rock slope under seismic load is proposed.The equilibrium condition is estimated based on the trend of the key points' displacements or velocities.The slide surface is also determined by the velocity or displacement vectors of the unstable condition.Based on the new method,the factor of safety of Zhongjiawan bedding slope is calculated by UDEC and compared with the results obtained by limit equilibrium method(LEM).It is revealed that the value calculated by UDEC is close to that by LEM,which indicates that the new method is feasible and reasonable.The influences of height and angle of bedding slope,inclination of interface as well as seismic parameters including amplitudes and frequency on the factor of safety of bedding rock slope under seismic load are analyzed.
Based on the strength reduction method,a new method to determine the factor of safety of bedding rock slope under seismic load is proposed.The equilibrium condition is estimated based on the trend of the key points' displacements or velocities.The slide surface is also determined by the velocity or displacement vectors of the unstable condition.Based on the new method,the factor of safety of Zhongjiawan bedding slope is calculated by UDEC and compared with the results obtained by limit equilibrium method(LEM).It is revealed that the value calculated by UDEC is close to that by LEM,which indicates that the new method is feasible and reasonable.The influences of height and angle of bedding slope,inclination of interface as well as seismic parameters including amplitudes and frequency on the factor of safety of bedding rock slope under seismic load are analyzed.
引文
[1]BOMMER J J,RODRIGUEZ C E.Earthquake-induced landslides in central America[J].Engineering Geology,2002,63(3):189–220.
[2]李树德,任秀生,岳升阳,等.地震滑坡研究[J].水土保持研究,2001,8(2):24–25.(LI Shude,REN Xiusheng,YUE Shengyang,et al.Study on earthquake-landslide[J].Research of Soil and Water Conservation,2001,8(2):24–25.(in Chinese))
[3]SHOU K J,WANG C F.Analysis of the Chiufengershan landslide triggered by the1999Chi-Chi earthquake in Taiwan[J].Engineering Geology,2003,68(3/4):237–250.
[4]LESHCHINSKY D,SAN K C.Pseudo-static seismic stability of slopes:design charts[J].Journal of Geotechnical Engineering,1994,120(9):1514–1532.
[5]BAKER R,GARBER M.Theoretical analysis of the stability of slopes[J].Geotechnique,1978,28(4):395–411.
[6]TAYLOR D W.Stability of earth slopes[J].J.Boston Society of Civ.Engrgs.,1937,24(3):197–246.
[7]SIYAHI B J,BILGE G.A pseudo-static stability analysis in normally consolidated soil slopes subjected to earthquakes[J].Technical Journal of Turkish Chamber of Civil Engineers,1998,9(1):1525–1552.
[8]LING H I,CHENG A H D.Rock sliding induced by seismic force[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(6):1021–1029.
[9]AUSILIO E,CONTE E,DENTE G.Seismic stability of reinforced slopes[J].Soil Dynamics and Earthquake Engineering,2000,19(3):159–172.
[10]SEED H B.Stability of earth and rockfill dams during earthquakes[C]//Embankment-dam Engineering(Casagrand Volume).New York:John Wiley and Sons,Inc.,1973:239–269.
[11]MATSUI T,SAN K C.Finite element slope stability analysis by shear strength reduction technique[J].Soils and Foundations,1992,32(1):59–70.
[12]葛修润,任建喜,李春光,等.三峡左厂3#坝段深层抗滑稳定三维有限元分析[J].岩土工程学报,2003,25(4):389–394.(GE Xiurun,REN Jianxi,LI Chunguang,et al.3D-FE analysis of deep sliding stability of#3dam foundation of left power house of the Three Gorges Project[J].Chinese Journal of Geotechnical Engineering,2003,25(4):389–394.(in Chinese))
[13]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,2002,4(10):57–61,78.(ZHENG Yingren,ZHAO Shangyi,ZHANG Luyu.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57–61,78.(in Chinese))
[14]DAWSON E M,ROTH W H,DRESCHER A.Slope stability analysis by strength reduction[J].Geotechnique,1999,49(6):835–840.
[15]卢增木.顺层岩石高边坡的稳定性研究[硕士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2005.(LU Zengmu.Study on stability of high rock bedding slopes[M.S.Thesis][D].Wuhan:Institutes of Rock and Soil Mechanics,Chinese Academy of Sciences,2005.(in Chinese))
[16]东南大学,清华大学.建筑结构抗震设计[M].北京:中国建筑工业出版社,1999.(Southeast University,Tsinghua University.Aseismic design of architectural structure[M].Beijing:China Architecture and Building Press,1999.(in Chinese))
[17]胡聿贤.地震工程学[M].北京:地震出版社,1988.(HU Yuxian.Seismic engineering[M].Beijing:Earthquake Press,1988.(in Chinese))
[18]Itasca Consulting Group Inc..Universal distinct element code(version3.1)user′s manual[R].Minneapolis,USA:Itasca Consulting Group Inc.,1999.
[19]刘亚群.爆破荷载作用下岩质边坡动态响应的数值模拟研究[硕士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2003.(LIU Yaqun.The numerical simulation of dynamical response of rock slope under explosion[M.S.Thesis][D].Wuhan:Institutes of Rock and Soil Mechanics,Chinese Academy of Sciences,2003.(in Chinese))
[2]李树德,任秀生,岳升阳,等.地震滑坡研究[J].水土保持研究,2001,8(2):24–25.(LI Shude,REN Xiusheng,YUE Shengyang,et al.Study on earthquake-landslide[J].Research of Soil and Water Conservation,2001,8(2):24–25.(in Chinese))
[3]SHOU K J,WANG C F.Analysis of the Chiufengershan landslide triggered by the1999Chi-Chi earthquake in Taiwan[J].Engineering Geology,2003,68(3/4):237–250.
[4]LESHCHINSKY D,SAN K C.Pseudo-static seismic stability of slopes:design charts[J].Journal of Geotechnical Engineering,1994,120(9):1514–1532.
[5]BAKER R,GARBER M.Theoretical analysis of the stability of slopes[J].Geotechnique,1978,28(4):395–411.
[6]TAYLOR D W.Stability of earth slopes[J].J.Boston Society of Civ.Engrgs.,1937,24(3):197–246.
[7]SIYAHI B J,BILGE G.A pseudo-static stability analysis in normally consolidated soil slopes subjected to earthquakes[J].Technical Journal of Turkish Chamber of Civil Engineers,1998,9(1):1525–1552.
[8]LING H I,CHENG A H D.Rock sliding induced by seismic force[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(6):1021–1029.
[9]AUSILIO E,CONTE E,DENTE G.Seismic stability of reinforced slopes[J].Soil Dynamics and Earthquake Engineering,2000,19(3):159–172.
[10]SEED H B.Stability of earth and rockfill dams during earthquakes[C]//Embankment-dam Engineering(Casagrand Volume).New York:John Wiley and Sons,Inc.,1973:239–269.
[11]MATSUI T,SAN K C.Finite element slope stability analysis by shear strength reduction technique[J].Soils and Foundations,1992,32(1):59–70.
[12]葛修润,任建喜,李春光,等.三峡左厂3#坝段深层抗滑稳定三维有限元分析[J].岩土工程学报,2003,25(4):389–394.(GE Xiurun,REN Jianxi,LI Chunguang,et al.3D-FE analysis of deep sliding stability of#3dam foundation of left power house of the Three Gorges Project[J].Chinese Journal of Geotechnical Engineering,2003,25(4):389–394.(in Chinese))
[13]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,2002,4(10):57–61,78.(ZHENG Yingren,ZHAO Shangyi,ZHANG Luyu.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57–61,78.(in Chinese))
[14]DAWSON E M,ROTH W H,DRESCHER A.Slope stability analysis by strength reduction[J].Geotechnique,1999,49(6):835–840.
[15]卢增木.顺层岩石高边坡的稳定性研究[硕士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2005.(LU Zengmu.Study on stability of high rock bedding slopes[M.S.Thesis][D].Wuhan:Institutes of Rock and Soil Mechanics,Chinese Academy of Sciences,2005.(in Chinese))
[16]东南大学,清华大学.建筑结构抗震设计[M].北京:中国建筑工业出版社,1999.(Southeast University,Tsinghua University.Aseismic design of architectural structure[M].Beijing:China Architecture and Building Press,1999.(in Chinese))
[17]胡聿贤.地震工程学[M].北京:地震出版社,1988.(HU Yuxian.Seismic engineering[M].Beijing:Earthquake Press,1988.(in Chinese))
[18]Itasca Consulting Group Inc..Universal distinct element code(version3.1)user′s manual[R].Minneapolis,USA:Itasca Consulting Group Inc.,1999.
[19]刘亚群.爆破荷载作用下岩质边坡动态响应的数值模拟研究[硕士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2003.(LIU Yaqun.The numerical simulation of dynamical response of rock slope under explosion[M.S.Thesis][D].Wuhan:Institutes of Rock and Soil Mechanics,Chinese Academy of Sciences,2003.(in Chinese))
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