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Geohazards and Risk in Developing Nations

地学前缘 2009年第S1期16卷 61-61页

作者： Gregory De Pascale Fugro William Lettis and Associates Inc

Geohazards,such as earthquakes,landslides, tsunamis,volcanic eruptions,floods,melting permafrost, and metastable soils impact people’s lives worldwide.Population growth is forcing people to live in areas that have classically supported low population densities including steep slopes,low-lying coasts,and along floodplains and currently climate change is exacerbating risk in these regions.

关键词： geohazards risk landslides earthquakes tsunamis soils permafrost mitigation volcanos

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Occurrence of landsliding on slopes where flowsliding had previously occurred:An investigation in a loess platform,North-west China

Occurrence of landsliding on slopes where flowsliding had pr...

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中国科学院地质与地球物理研究所2013年度（第13届）...

作者： L.Xu F.C.Dai X.B.Tu I.Javed M.J.Woodard Y.L.Jin L.G.Tham Institute of Geology and Geophysics Chinese Academy of Sciences Department of Earth Sciences COMSATS Institute of Information Technology

Loess slides in South Jingyang platform,Shaanxi Province,usually occur on slopes where loess flowslides had previously occurred,Numerical modeling shows that flowslide occurrence causes conditions that increase shear stress and water content in the subsequent slopes,Both of these factors move the soil stress states towards its theoretical failure line,Under these conditions only small increases in water content can cause soil collapse,This leads to the backscarps of former flowslides being much more prone to landsliding,Wetting test results show that the loess can collapse suddenly as the water content gradually increases.Therefore, the wetting process induced by continued irrigation may result in the subsequent slides.During constant water content tests of the loess material soil shear strength increases with the development of specimen deformation, Therefore,slide mobilization,which may be a relatively slow process,is dependent on whether the wetting conditions exist,Finally,a slope evolution model for loess platforms is proposed in this study,

关键词： landslides Numerical modeling Wetting test Constant water content test Slope evolution Loess Plateau

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Some geomechanical properties of soil-rock mixtures in the Hutiao Gorge area,China

Some geomechanical properties of soil-rock mixtures in the H...

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中国科学院地质与地球物理研究所2007学术年会

作者： W.-J.XU,R.-L.HU and R.-J.TAN Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing, China.

Soil-rock mixtures,which are very complicated inhomogeneous materials,are widely encountered in geotechnical engineering projects.In this paper,in situ tests were performed on six samples of soil-rock mixtures in the Hutiao Gorge reservoir area to examine their mechanical characteristics.The deformation of the mixtures is closely related to the weight proportion of rock fragments and their size distribution,indicating that there may be critical fragment sizes that influence their mechanical properties,particularly cohesion.The soil-rock mixtures are sensitive to water.The results of the comparison between the tests of natural soil-rock mixtures and simulated-rain soil-rock mixtures give useful measured data for engineering evaluation and design.For natural soil-rock mixtures the cohesion c was 1·53 kPa and the internal friction angleφwas 46·0°;for saturated soilrock mixtures c was 0·30 kPa andφwas 59·2°. Les melanges terre-roche,qui represented des materiaux inhomogenes particulierement complexes,se rencontrent frequemment dans les projets d’ingenierie geotechnique. Cet article decrit des tests realises in situ sur six echantillons de melanges terre-roche,dans la region de la reserve de la gorge Hutiao,pour ctudier leurs proprietes mecaniques. La deformation des melanges est etroitement lice a la proportion en poids des fragments de roche et a leur distribution en faille,indiquant ainsi qu’il peut exister des dimensions de fragments critiques qui influencent leur proprietes mecaniques,en particulier leur cohesion.Les melanges terre-roche sont sensibles a I’eau.Les resultats de la comparaison entre les essais realises sur des melanges terre-roche naturels et ceux effectues sur des melanges exposes a une pluie artilicielle fournissent des informations utiles pour revaluation en ingenierie et conception industrielle.Pour les melanges terre-roche,la cohesion c etait de 1,53 kPa et Tangle de frottement interne de 46,0°;pour les melanges terre-roche satures,c etait de 0,30 kPa et I’angle de frottement interne de 59,28.

关键词： in situ testing landslides shear strength

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Landslide-risk zonation along mountainous highway considering rock mass classification

Landslide-risk zonation along mountainous highway considerin...

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中国科学院地质与地球物理研究所2015年度（第15届）...

作者： Shengwen Qi Xingxing Li Songfeng Guo Zhifa Zhan Haijun Liao Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Beijing Institute of Geology

Landslide and especially rockfall hazard widely occurs along cut slopes in mountainous regions.The risk assessment of mass movements is still one of most challenging problems in slope engineering geology.We propose a routine method to assess rock slide and rockfall risk of cut slopes essentially based on slope properties and rock mass structure.The method is a lean low-cost path to a risk estimate.Rock block size is simplified into two classes,{small}with a volume less than 1.0 m and{large},greater than 1.0 m.Studies indicate that for a slope with n small-medium rock blocks,the possibility of rockfalls can be estimated by 1-(1-P),in which P is the likelihood of one{small}rock block fall.The possibility of other types of mass movement can be determined by the firstorder second-moment(FOSM)method.Based on this,an exponent equation was adopted to evaluate the consequence and the risk.The methodology is demonstrated by a case study from the mountains of Mentougou district,Beijing,China.Based on the investigations of geological conditions(i.e.,lithology,weathering and rock mass structure)and some historical mass movement data of the cut slopes,a zonation map for rockfall and rock slide risk along a 17-km section of a road is presented.The result is supported by mass movement event observations in the recent 2 years.

关键词： landslides Rockfall Rockslide Cut slope Risk Highway

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