厚层堆积层震裂斜坡变形特征及破坏机制——以小金县某震裂不稳定斜坡为例
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摘要
"5.12"汶川特大地震形成了震区大量的震裂不稳定斜坡,其中绝大部分发生在厚层堆积层斜坡中,这类次生地质灾害有着特殊的力学破坏机制。以小金县某不稳定斜坡为例,研究了高程、地形坡度、岩土体结构条件等对斜坡动力响应的影响,初步分析了厚层堆积层震裂斜坡的变形特征及破坏机制。认为,在地震动力作用下厚层堆积物斜坡往往出现潜在多级滑动面的现象,且破裂面多沿着堆积层中某些曲面发生滑动破坏,这与地震瞬间拉张破坏在斜坡体中产生的震裂缝深度和延伸有关。总的来说,震裂不稳定斜坡的失稳可以认为是地震使边坡岩土体力学参数降低、震后地下水的软化共同作用下累计破坏的结果。
"5.12" Wenchuan earthquake in the formation of a large earthquake shattered unstable slopes,most of which occurred in the thick layer of accumulative formation,the pattern of secondary geological disasters has a special theor of phyical destroy.A case study of unstable slopes in Xiaojin County,research the elevation,terrain slope,soil structure conditions on the dynamic response of slopes,preliminary analysis of the thick layer of colluvial slopes shattered deformation and failure mechanism.Deemed,under the action of the earthquake dynamics,the thick layer of seismic slope deposits are often a potential phenomenon of multi-level sliding surface,and the fracture plane more than some of the layers along the slip surface damage occurred.This is related of the depth and extension of seismic fractures on the slpoe,formed by the earthquake instantaneous tensile failure.Total,the shattered unstable slope instability can be considered earthquake physical parameters of soil decreased slope after the earthquake ground water under the action of softening the cumulative damage results.
"5.12" Wenchuan earthquake in the formation of a large earthquake shattered unstable slopes,most of which occurred in the thick layer of accumulative formation,the pattern of secondary geological disasters has a special theor of phyical destroy.A case study of unstable slopes in Xiaojin County,research the elevation,terrain slope,soil structure conditions on the dynamic response of slopes,preliminary analysis of the thick layer of colluvial slopes shattered deformation and failure mechanism.Deemed,under the action of the earthquake dynamics,the thick layer of seismic slope deposits are often a potential phenomenon of multi-level sliding surface,and the fracture plane more than some of the layers along the slip surface damage occurred.This is related of the depth and extension of seismic fractures on the slpoe,formed by the earthquake instantaneous tensile failure.Total,the shattered unstable slope instability can be considered earthquake physical parameters of soil decreased slope after the earthquake ground water under the action of softening the cumulative damage results.
引文
[1]Feng Wenkai,Xu Qiang,Huang Runqiu.Preliminary study on me-chanical mechanism of slope earthquake induced deformation[J].Chinese Journal of Rock Mechanics and Engineering,2010,28(Sup-pl.)1:3125-3129[冯文凯,许强,黄润秋.斜坡震裂变形力学机制初探[J].岩石力学与工程学报,2010,28(增)1:3125-3129]
[2]Qi Shengwen,Wu Faquan,Liu Chunling,et al.Engineering geologyanalysis on stability of slope under earthquake[J].Chinese Journalof Rock Mechanics and Engineering,2010,23(16):2793-2796[祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2010,23(16):2793-2796]
[3]Ju Nengpan,Hou Weilong,Zhao Jianjun,et al.Geohazards of Jushuiriver in the Wenchuan Earthquak area[J].Journal of Mountain Sci-ence,2010,28(6):732-740[巨能攀,侯伟龙,赵建军,等.安县雎水河流域地质灾害发育、分布及影响因素[J].山地学报,2010,28(6):732-740]
[4]Ding Xiumei.A study on the deformation and stability of typical deb-ris&embankment Slope with complicated environment in Southwest-ern China[D].PhD thesis,Chengdu University of Technology,2005:10-80[丁秀美.西南地区复杂环境下典型堆积(填)体斜坡变形及稳定性研究[D].成都理工大学博士学位论文,2005:10-80]
[5]Specification of geological investigation for landslide stabilization(DZ/T0218-2006)[S].[滑坡防治工程勘查规范(DZ/T0218-2006)[S].]
[2]Qi Shengwen,Wu Faquan,Liu Chunling,et al.Engineering geologyanalysis on stability of slope under earthquake[J].Chinese Journalof Rock Mechanics and Engineering,2010,23(16):2793-2796[祁生文,伍法权,刘春玲,等.地震边坡稳定性的工程地质分析[J].岩石力学与工程学报,2010,23(16):2793-2796]
[3]Ju Nengpan,Hou Weilong,Zhao Jianjun,et al.Geohazards of Jushuiriver in the Wenchuan Earthquak area[J].Journal of Mountain Sci-ence,2010,28(6):732-740[巨能攀,侯伟龙,赵建军,等.安县雎水河流域地质灾害发育、分布及影响因素[J].山地学报,2010,28(6):732-740]
[4]Ding Xiumei.A study on the deformation and stability of typical deb-ris&embankment Slope with complicated environment in Southwest-ern China[D].PhD thesis,Chengdu University of Technology,2005:10-80[丁秀美.西南地区复杂环境下典型堆积(填)体斜坡变形及稳定性研究[D].成都理工大学博士学位论文,2005:10-80]
[5]Specification of geological investigation for landslide stabilization(DZ/T0218-2006)[S].[滑坡防治工程勘查规范(DZ/T0218-2006)[S].]
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