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Article: Characteristics and forming mechanism of the plateau-edge cracks and their significance to loess landslides

TitleCharacteristics and forming mechanism of the plateau-edge cracks and their significance to loess landslides
臺緣裂縫發育特征、成因機制及其對黃土滑坡的意義
Authors
KeywordsLoess Plateau
Loess landslide
Plateau edge cracks
Developing characteristics
South Jingyang Plateau
Issue Date2009
Publisher科学出版社. The Journal's website is located at http://dzlp.periodicals.net.cn/default.html
Citation
地質論評, 2009, v. 55 n. 1, p. 85-90 How to Cite?
Geological Review, 2009, v. 55 n. 1, p. 85-90 How to Cite?
Abstract黃土滑坡是我國西北地區非常嚴重的地質災害現象,后緣裂縫是黃土滑坡典型特征之一。陜西省涇陽南塬自1976年大面積農業灌溉以來,發生了27處50余起黃土滑坡。研究區塬邊裂縫發育,滑坡密集分布的太平至蔣劉段目前共分布著28條裂縫,總延展長度為1424m。塬邊地形形態控制著裂縫的發育、成因機制,因此,根據裂縫所處塬邊地形形態,將南塬裂縫發育模式分為:'U'模式、'W'模式和'Z'模式。裂縫形成后對塬邊滑坡的發展產生重要影響,使得坡體土體應力狀態接近破壞邊界面,只需較小的孔壓增量和荷載即可誘發滑坡,同時,改變了地表水的入滲途徑,極大地增加了地面灌溉和降雨誘發滑坡的概率。同時,裂縫的形成對于黃土滑坡的演化和群體性分布具有重要的意義。 Loess landslide is the most catastrophic geohazard in Northwestern China. Plateau edge crack is one of the representative characteristics for most loess landslides. Groundwater table in the South Jingyang Plateau, Shaanxi Province has been significantly raised since 1976 and more than 50 landslide events have occurred at 27 sites, resulting in large economic loss and numerous deaths. Based on field survey and measurements of cracks at South Jingyang Plateau, it can be concluded that 28 cracks with a total length of 1424 m were developed at the edge of the study area. Based on the topographic features, the cracks can be classified as 'U' model, 'W' model and 'Z' model. At the initial stage, cracks are caused by the accumulated small strain of the slope soils. The present features of cracks can only reflect the present geological conditions. The forming mechanisms of 'U' model, 'W' model and 'Z' model cracks are, thus, very similar to but not the above mentioned mechanism. Cracks developed change soil stress state and make it to be near the collapse surface, and then a small load or water infiltration can induce landslides. Cracks that can collect surface water and increase the possibility of rain or irrigation induced landslides. Cracks also have important significance to loess Landslides evolution and 'group distribution' characteristics.
Persistent Identifierhttp://hdl.handle.net/10722/169209
ISSN

 

DC FieldValueLanguage
dc.contributor.authorXu, Len_US
dc.contributor.authorDai, FCen_US
dc.contributor.authorKwong, AKLen_US
dc.contributor.authorTham, LGen_US
dc.contributor.authorTu, XBen_US
dc.date.accessioned2012-10-18T08:45:42Z-
dc.date.available2012-10-18T08:45:42Z-
dc.date.issued2009en_US
dc.identifier.citation地質論評, 2009, v. 55 n. 1, p. 85-90en_US
dc.identifier.citationGeological Review, 2009, v. 55 n. 1, p. 85-90-
dc.identifier.issn0371-5736-
dc.identifier.urihttp://hdl.handle.net/10722/169209-
dc.description.abstract黃土滑坡是我國西北地區非常嚴重的地質災害現象,后緣裂縫是黃土滑坡典型特征之一。陜西省涇陽南塬自1976年大面積農業灌溉以來,發生了27處50余起黃土滑坡。研究區塬邊裂縫發育,滑坡密集分布的太平至蔣劉段目前共分布著28條裂縫,總延展長度為1424m。塬邊地形形態控制著裂縫的發育、成因機制,因此,根據裂縫所處塬邊地形形態,將南塬裂縫發育模式分為:'U'模式、'W'模式和'Z'模式。裂縫形成后對塬邊滑坡的發展產生重要影響,使得坡體土體應力狀態接近破壞邊界面,只需較小的孔壓增量和荷載即可誘發滑坡,同時,改變了地表水的入滲途徑,極大地增加了地面灌溉和降雨誘發滑坡的概率。同時,裂縫的形成對于黃土滑坡的演化和群體性分布具有重要的意義。 Loess landslide is the most catastrophic geohazard in Northwestern China. Plateau edge crack is one of the representative characteristics for most loess landslides. Groundwater table in the South Jingyang Plateau, Shaanxi Province has been significantly raised since 1976 and more than 50 landslide events have occurred at 27 sites, resulting in large economic loss and numerous deaths. Based on field survey and measurements of cracks at South Jingyang Plateau, it can be concluded that 28 cracks with a total length of 1424 m were developed at the edge of the study area. Based on the topographic features, the cracks can be classified as 'U' model, 'W' model and 'Z' model. At the initial stage, cracks are caused by the accumulated small strain of the slope soils. The present features of cracks can only reflect the present geological conditions. The forming mechanisms of 'U' model, 'W' model and 'Z' model cracks are, thus, very similar to but not the above mentioned mechanism. Cracks developed change soil stress state and make it to be near the collapse surface, and then a small load or water infiltration can induce landslides. Cracks that can collect surface water and increase the possibility of rain or irrigation induced landslides. Cracks also have important significance to loess Landslides evolution and 'group distribution' characteristics.-
dc.languagechien_US
dc.publisher科学出版社. The Journal's website is located at http://dzlp.periodicals.net.cn/default.html-
dc.relation.ispartof地質論評en_US
dc.relation.ispartofGeological Review-
dc.subjectLoess Plateau-
dc.subjectLoess landslide-
dc.subjectPlateau edge cracks-
dc.subjectDeveloping characteristics-
dc.subjectSouth Jingyang Plateau-
dc.titleCharacteristics and forming mechanism of the plateau-edge cracks and their significance to loess landslidesen_US
dc.title臺緣裂縫發育特征、成因機制及其對黃土滑坡的意義-
dc.typeArticleen_US
dc.identifier.emailKwong, AKL: kwongakl@hkucc.hku.hken_US
dc.identifier.emailTham, LG: hrectlg@hku.hken_US
dc.identifier.authorityKwong, AKL=rp00129en_US
dc.identifier.authorityTham, LG=rp00176en_US
dc.identifier.hkuros212160en_US
dc.identifier.hkuros160207-
dc.identifier.volume55en_US
dc.identifier.issue1en_US
dc.identifier.spage85en_US
dc.identifier.epage90en_US
dc.publisher.placeChina-

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