贵州惠水鑫朋滑坡变形破坏机制
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摘要
以贵州省惠水县宁旺乡鑫朋滑坡为例,依据野外调查成果,分析了滑坡结构及变形特征,结合滑坡所处的地质环境条件讨论了其稳定性影响因素,借助Geostudio分析了坡体后缘崩塌堆积体加载及降雨对滑坡的作用机制。分析结果表明:持续降雨和坡体后缘加载共同作用使第四系地层与基岩接触面产生压应力集中,坡脚处孔隙水压力持续增大,第四系地层因受到雨水浸润稳定性降低,在堆积体牵引下发生浅层蠕滑变形,因此认为鑫朋滑坡变形失稳机制为整体蠕滑-拉裂。
An example of the Xinpeng Landslide in Huishui county of Guizhou Province,based on the field investigation results,the structure and deformation characteristics of the landslide were analyzed,and the factors affecting the stability of the landslide were discussed in combination with the geological environment conditions of the landslide. With the help of Geostudio,the action mechanism of the landslide was analyzed by the collapse accumulation body loading at the crown of landslide and rainfall. The analysis results showed that the combined action of continuous rainfall and loading at the crown of landslide resulted in the compressive stress concentration in the contact surface between the quaternary strata and bedrock. The pore-water pressure at the foot of the slope continued to increase. The stability of the quaternary strata is decreased by rain infiltration,and the shallow creep deformation occurred under the traction of the accumulation body.Therefore,it was considered that the deformation and instability mechanism of Xinpeng landslide as the creepsliding and fracturing.
An example of the Xinpeng Landslide in Huishui county of Guizhou Province,based on the field investigation results,the structure and deformation characteristics of the landslide were analyzed,and the factors affecting the stability of the landslide were discussed in combination with the geological environment conditions of the landslide. With the help of Geostudio,the action mechanism of the landslide was analyzed by the collapse accumulation body loading at the crown of landslide and rainfall. The analysis results showed that the combined action of continuous rainfall and loading at the crown of landslide resulted in the compressive stress concentration in the contact surface between the quaternary strata and bedrock. The pore-water pressure at the foot of the slope continued to increase. The stability of the quaternary strata is decreased by rain infiltration,and the shallow creep deformation occurred under the traction of the accumulation body.Therefore,it was considered that the deformation and instability mechanism of Xinpeng landslide as the creepsliding and fracturing.
引文
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[14]海龙，梁冰．考虑降雨入渗条件的土坡稳定性分析[J]．水资源与工程学报，2010,21(4):47-50.HAI Long,LIANG Bing. Analysis of land slope stability considering rainfall infiltration[J]. Journal of Water Resources and Water Engineering,2010,21(4):47-50.
[2]张倬元，王士天，王兰生．工程地质分析原理[M]. 2版．北京:地质出版社，1994.ZHANG Zhuoyuan,WANG Shitian,WANG Lansheng.Principles of engineering geological analysis[M]. 2nd edition. Beijing:Geological Publishing House,1994.
[3]李明辉，郑万模，石胜伟，等．丹巴县甲居滑坡复活机制及其稳定性分析[J]．山地学报，2008,26(5):577-582.LI Minghui,ZHENG Wanmo,SHI Shengwei,et al. The revival mechanism and stability analysis to Jiaju landslide of Danba County in Sichuan Province[J].Mountain Research,2008,26(5):577-582.
[4]黄润秋．20世纪以来中国的大型滑坡及其发生机制[J]．岩石力学与工程学报，2007,26(3):434-454.HUANG Runqiu. Large-scale landslide and their sliding mechanism in China since the 20th century[J]. Chinese Journal of Rock Mechanics and Engineering,2007,26(3):434-454.
[5]黄润秋，许强．中国典型灾难性滑坡[M]．北京:科学出版社，2008.HUANG Runqiu,XU Qiang. Catastrophic landslides in China[M]. Beijing:Science Press,2008.
[6]王恭先，许峻岭，刘光代，等．滑坡学与滑坡防治技术[M]．北京:中国铁道出版社，2004.WANG Gongxian,XU Junling,LIU Guangdai,et al.Landslide science and landslide control technology[M]. Beijing:China Railway Publishing House,2004.
[7]殷志强．黄河上游因人工加载和降雨引发的虎头崖滑坡[J]．中国地质灾害与防治学报，2014,25(4):10.YIN Zhiqiang. Hutouya landslide caused by artificial loading and rainfall in the upper reaches of the Yellow River[J]. The Chinese Journal of Geological Hazard and Control,2014,25(4):10.
[8]董夫钱，缪志顺，吕庆，等．公路堆载诱发型滑坡稳定性分析[J]．岩石力学与工程学报，2004(增刊1):4517-4520.DONG Fuqian,MIAO Zhishun,LYU qing,et. al.Mechanism analysis of landslide induced by accumulation loading of highway[J]. Chinese Journal of Rock Mechanics and Engineering,2004(S1):4517-4520.
[9]吴迪．工程堆载触发黄土滑坡研究[D]．西安:长安大学，2015.WU Di. Rearch on the loess landslide triggered by engineering loading[D]. Xi’ an:Changan University,2015.
[10]尤琳，沈军辉，彭昌翠，等．四川省青川县银溪窝滑坡复活机制研究及其稳定性评价[J]．水土保持研究，2011,18(2):44-47.YOU Lin,SHEN Junhui,PENG Changcui,et al. Study on the resurrection mechanism and stability of silver creek nest landslide of Qingchuan County in Sichuan Province[J]. Research of Soil and Water Conservation,2011,18(2):44-47.
[11]吴亚子，傅荣华，王健，等．大渡河送坪滑坡形成机制及稳定性分析[J]．水土保持研究，2011,18(2):62-65.WU Yazi,FU Ronghua,WANG Jian,et al. Analysis on formation mechanism and stability for the landslide in Songping beside Daduhe River[J]. Research of Soil and Water Conservation,2011,18(2):62-65.
[12]史文兵，黄润秋，左双英，等．贵州省贵定县定东小学滑坡形成机制[J]．水土保持通报，2015,35(1):287-290.SHI Wenbing,HUANG Runqiu,ZUO Shuangying,et al. Landslide formation mechanism at Dingdong primary school of Guiding County in Guizhou Province[J]. Bulletin of Soil and Water Conservation,2015,35(1):287-290.
[13]万文．水位循环升降下库岸边坡渗流与应力耦和分析及稳定性研究[D]．南昌:南昌大学，2012.WAN Wen. The analysis about seepage and stress coupling of the bank slope under the cycle of water lifting and the study of stability[D]. Nanchang:Nanchang University,2012.
[14]海龙，梁冰．考虑降雨入渗条件的土坡稳定性分析[J]．水资源与工程学报，2010,21(4):47-50.HAI Long,LIANG Bing. Analysis of land slope stability considering rainfall infiltration[J]. Journal of Water Resources and Water Engineering,2010,21(4):47-50.