地震与非地震诱发滑坡的运动特征对比研究
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摘要
针对不同诱发机制的滑坡运动特征差异,以滑坡的总斜率和阻止系数为评价指标,分析滑坡的总斜率、阻止系数与滑坡规模、总能量的关系,对比研究了地震和非地震滑坡的总斜率、地形阻止系数的特征。研究结果表明:地震与非地震滑坡的规模越大在运动过程中受到的阻止作用越小;地震滑坡和非地震滑坡的总斜率都随滑坡规模和总能量增加而减小,但地震滑坡减小的速率大于非地震滑坡;地震滑坡的平均阻止系数约为0.4～0.5,而非地震滑坡的平均阻止系数约为同规模地震滑坡的40%～50%。因此,滑坡的运动特征不仅受滑坡规模及总能量控制,还显著地受滑坡的诱发机制和地形阻止等因素的影响。
Aiming at different landslides movement behavior due to different inducement mechanisms,the total slopes and block coefficients of landslides were considered as evaluation indices to analyze the relationship between total slopes,block coefficients and landslide volumes,total energies;the total slopes and block coefficients of seismic and non-seismic induced landslides were studied contrastively.The results indicate that the volumes of seismic and non-seismic induced landslides are larger;the blocks of ground are smaller.The total slopes of seismic and non-seismic induced landslides decrease with the increase of volumes and energies;but the decrease ratios of seismic induced landslides are larger than non-seismic induced landslides.The average block coefficients of seismic induced landslides are about 0.4 to 0.5 and the average block coefficients of non-seismic induced landslides are about 40%to 50%of seismic induced landslides at the same volume.The results show that landslide movement behaviors are not only controlled by the volume and total energy,but also restricted by the landslide inducement mechanism and terrain block.
Aiming at different landslides movement behavior due to different inducement mechanisms,the total slopes and block coefficients of landslides were considered as evaluation indices to analyze the relationship between total slopes,block coefficients and landslide volumes,total energies;the total slopes and block coefficients of seismic and non-seismic induced landslides were studied contrastively.The results indicate that the volumes of seismic and non-seismic induced landslides are larger;the blocks of ground are smaller.The total slopes of seismic and non-seismic induced landslides decrease with the increase of volumes and energies;but the decrease ratios of seismic induced landslides are larger than non-seismic induced landslides.The average block coefficients of seismic induced landslides are about 0.4 to 0.5 and the average block coefficients of non-seismic induced landslides are about 40%to 50%of seismic induced landslides at the same volume.The results show that landslide movement behaviors are not only controlled by the volume and total energy,but also restricted by the landslide inducement mechanism and terrain block.
引文
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[4]GUZZETTI F.Landslide fatalities and the evaluation of landslide risk in Italy[J].Engineering Geology,2000,58(2):89-107
[5]谷天峰,王家鼎,梁辉,等.均质土体滑坡运动规律分析[J].西北大学学报(自然科学版),2006,36(3):437-441.GU Tian-feng,WANG Jia-ding,LIANG Hui,et al.The analysis of movement regularity on homogeneous soil landslide[J].Journal of Northwest University(Natural Science Edition),2006,36(3):437-441.
[6]黄润秋,李为乐.汶川大地震触发地质灾害的断层效应分析[J].工程地质学报,2009,17(1):19-28.HUANG Run-qiu,LI Wei-le.Fault effect analysis of geo-hazards triggered by Wenchuan earthquake[J].Chinese Journal of Engineering Geology,2009,17(1):19-28.
[7]GEERTSEMA M,CLAGUE J J,JAMES W,et al.An overview of recent large catastrophic landslides in northern British Columbia,Canada[J].Engineering Geology,2006,83:120-143.
[8]韩金良,燕军军,吴树仁,等.四川汶川Ms8级地震触发的典型滑坡的风险指标反演[J].地质通报,2009,28(8):1146-1155.HAN Jin-liang,YAN Jun-jun,WU Shu-ren,et al.Risk indexes inversion of typical landslide triggered by the Ms8.0Wenchuan earthquake,Sichuan,China[J].Geological Bulletin of China,2009,28(8):1146-1155.
[9]方玉树.高位能滑坡运程探讨[J].后勤工程学院学报,2007,23(4):16-20.FANG Yu-shu.On reach of the landlside with high potential energy[J].Journal of Logistical Engineering Universty,2007,23(4):16-20.
[10]黄润秋.汶川8.0级地震触发崩滑灾害机制及其地质力学模式[J].岩石力学与工程学报,2009,28(6):1239-1249.HUANG Run-qiu.Mechanism and geomechanical modes of landslide hazards triggered by Wenchuan8.0earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1239-1249.
[11]黄润秋,许强.中国典型灾难性滑坡[M].北京:科学出版社,2008.
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