地震和降雨诱发的两个流动性滑坡的流动化机制及运动模拟(英文)
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摘要
通过野外现场调查,室内土质试验和数值模拟,对由地震诱发的筑馆滑坡和降雨诱发的山科滑坡的流动化机制的差异进行了分析。对于筑馆滑坡,滑带土在地震作用下产生液化以后,由于土粒子破碎效应,以及火碎流堆积物的高速剪切效应所导致的高孔隙水压的产生是导致其高速远程滑动的主要原因。山科滑坡的流动化原因则为,由于饱水的风化泥岩具较低的透水性,使得滑坡体在运动中只能发挥很低的剪切强度。
The difference between the fluidization mechanisms of the Tsukidate flowslide triggered by earthquake and the Yamashina flowslides induced by rainfall was examined through field investigations |soil tests and numerical simulations. In the case of the Tsukidate flowslide| after a liquefaction of sliding mass the combination effect of grain crushing and rapid shearing rate of the pyroclastic material on the excess pore pressure generation was concluded as the main reason. While in the case of the Yamashina flowslides the low shear strength mobilized in the fully saturated weathered mudstone debris with a very low permeability was attributed to the high mobility of the flowslides.
The difference between the fluidization mechanisms of the Tsukidate flowslide triggered by earthquake and the Yamashina flowslides induced by rainfall was examined through field investigations |soil tests and numerical simulations. In the case of the Tsukidate flowslide| after a liquefaction of sliding mass the combination effect of grain crushing and rapid shearing rate of the pyroclastic material on the excess pore pressure generation was concluded as the main reason. While in the case of the Yamashina flowslides the low shear strength mobilized in the fully saturated weathered mudstone debris with a very low permeability was attributed to the high mobility of the flowslides.
引文
[1]Wang G H,Sassa K.Factors affecting rainfall-induced flowslides in laboratory flume tests[J].Geotechnique,2001,51(7):587–599.
[2]Sassa K,Wang G,Fukuoka H.Mechanism of transition from slide to flow in granular soils[A].In:Proc.ISSMGE TC–11(Landslides)&ATC–9[C].Trabzon,Turkey:[s.n.],2001.1–19.
[3]Wang F W,Sassa K.Relationship between grain crushing and excess pore pressure generation by sandy soils in ring-shear tests[J].Journal of Natural Disaster Science,2000,22(2):87–96.
[4]Okada Y,Sassa K,Fukuoka H.Liquefaction and the steady state of weathered granitic sands obtained by undrained ring shear tests:a fundamental study of the mechanism of liquidized landslides[J].Journal of Natural Disaster Science,2000,22(2):75–85.
[5]Fukuoka H,Wang G H,Sassa K,et al.Earthquake-induced rapid long-traveling flow phenomenon:May2003Tsukidate landslide in Japan[J].International Journal on Landslides,2004,1(2):151–155.
[6]Inspection Committee of the Japan Landslide Society,Inspection Committee of the APERIF.A report of the landslide disaster activated at Tsukidate Miyagi Pref.by the Sanriku-minami earthquake,26May,2003[J].Landslide:Japan Landslide Society,2003,40(2):45–46.
[7]Sassa K.Geotechnical model for the motion of landslides[A].In:Proc.5th Int.Symp.on Landslides[C].[s.l.]:[s.n.],1988.37–56.
[8]Wang F W,Sassa K.A modified geotechnical simulation model for the areal prediction of landslide motion[A].In:Proc.1st European Conf.on Landslides[C].Prague:[s.n.],2002.735–740.
[9]Tanaka Y,Wang F W et al.Feature and sliding mechanism of a flowslide triggered by continual rainfall in Yamashina area,Kanazawa City,Japan[J].Landslide:Japan Landslide Society,2005.(in press).
[2]Sassa K,Wang G,Fukuoka H.Mechanism of transition from slide to flow in granular soils[A].In:Proc.ISSMGE TC–11(Landslides)&ATC–9[C].Trabzon,Turkey:[s.n.],2001.1–19.
[3]Wang F W,Sassa K.Relationship between grain crushing and excess pore pressure generation by sandy soils in ring-shear tests[J].Journal of Natural Disaster Science,2000,22(2):87–96.
[4]Okada Y,Sassa K,Fukuoka H.Liquefaction and the steady state of weathered granitic sands obtained by undrained ring shear tests:a fundamental study of the mechanism of liquidized landslides[J].Journal of Natural Disaster Science,2000,22(2):75–85.
[5]Fukuoka H,Wang G H,Sassa K,et al.Earthquake-induced rapid long-traveling flow phenomenon:May2003Tsukidate landslide in Japan[J].International Journal on Landslides,2004,1(2):151–155.
[6]Inspection Committee of the Japan Landslide Society,Inspection Committee of the APERIF.A report of the landslide disaster activated at Tsukidate Miyagi Pref.by the Sanriku-minami earthquake,26May,2003[J].Landslide:Japan Landslide Society,2003,40(2):45–46.
[7]Sassa K.Geotechnical model for the motion of landslides[A].In:Proc.5th Int.Symp.on Landslides[C].[s.l.]:[s.n.],1988.37–56.
[8]Wang F W,Sassa K.A modified geotechnical simulation model for the areal prediction of landslide motion[A].In:Proc.1st European Conf.on Landslides[C].Prague:[s.n.],2002.735–740.
[9]Tanaka Y,Wang F W et al.Feature and sliding mechanism of a flowslide triggered by continual rainfall in Yamashina area,Kanazawa City,Japan[J].Landslide:Japan Landslide Society,2005.(in press).
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