厦门沪救码头附近海底滑坡特征及机理
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摘要
根据多种勘察手段的识别,查明厦门沪救码头附近海底地形等值线明显扭曲;码头南侧外块石与淤泥互为翻转;滑体后方淤泥可见到蜂窝状孔隙;北码头一带不连续分布有新近沉积的灰黄色淤泥且沿海岸;另外地震映像也出现绕射波相对严重等现象。本文结合地形、地层、海洋水动力条件等因素,对滑动机理进行综合分析;在不考虑海浪、地震作用下,对水下坡体采用极限平衡理论方法、后壁岸坡选择圆弧条分法进行不同的稳定性评价。研究得出:该海底滑坡形成是自然地质、人为活动和重力、海洋动力共同作用以及地层因素的综合结果。
This paper is based on the configuration characteristics and topographical changes of the seabed landslide and the results of geophysical exploration and engineering geological prospecting.The structural deterioration characteristics are recognised.A comprehensive analysis of the sliding mechanism is carried out using the following factors: topography,stratum,hydrodynamic conditions and the landslide structure.For different landslide factors,different stability evaluation methods are adopted n.For the submarine landslide,the limiting equilibrium method is adopted;for the posterior landslide,the arc slice method is used.The parameters of the undisturbed and remoulded soft soil samples taken from the submarine landslide are used in calculation.It is found that this submarine landslide was caused by the integrated effect of natural geology,human activity,gravitation and ocean dynamics.The stability factor is far below 1.The findings provide a qualitative and quantitative scientific basis for the landslide remediation.
This paper is based on the configuration characteristics and topographical changes of the seabed landslide and the results of geophysical exploration and engineering geological prospecting.The structural deterioration characteristics are recognised.A comprehensive analysis of the sliding mechanism is carried out using the following factors: topography,stratum,hydrodynamic conditions and the landslide structure.For different landslide factors,different stability evaluation methods are adopted n.For the submarine landslide,the limiting equilibrium method is adopted;for the posterior landslide,the arc slice method is used.The parameters of the undisturbed and remoulded soft soil samples taken from the submarine landslide are used in calculation.It is found that this submarine landslide was caused by the integrated effect of natural geology,human activity,gravitation and ocean dynamics.The stability factor is far below 1.The findings provide a qualitative and quantitative scientific basis for the landslide remediation.
引文
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[10]赵旭峰,王春苗.厦门海底隧道围岩稳定动态反演分析[J].工程地质学报,2007,15(2):228~232.Zhao Xufeng,Wang Chunmiao.Dynamic displacement back-a-nalysis on stability of surrounding rocks along Xiamen sub-seatunnel.Journal of Engineering Geology,2007,15(2):228~232.
[2]Henkel D.i..The role of waves in causing submarine landslides[J].Geotechnique,1970,20(1):75~80.
[3]章卫胜,宋志尧等.中国近海潮波运动特征分析[A].第十二届中国海岸工程学术讨论会论文集[C].北京,海洋出版社,2005,455~461.Zhang Weisheng,Song Zhiyao,et al..Motion-character analysisof tidal waves in offshore china[A].The Twelve China CoastalEngineering Symposium Collected Papers,Bei Jing,Ocean Press,2005,455~461.
[4]孙永福,董立峰,蒲高军,宋玉鹏.风暴潮作用下黄河水下三角洲斜坡稳定性研究[J].工程地质学报,2006,14(5):582~587.Sun Yongfu,Dong Lifeng,Pu Gaojun,Song Yupeng,Stability a-nalysis of slopes in the subaqueous delta of the YellowRiver understorm wave loading.Journal of Engineering Geology,2006,14(5):582~587.
[5]张伟,陈正汉等.厦门近岸海床稳定性分析[J].水利与建筑工程学报,2005,(1):45~48.Zhang Wei,Chen Zhenghan,et al..Stability analysis of seabed byshore in Xiamen.Journal of Water Resources and ArchitecturalEngineering,2005,3(1):45~48.
[6]张伟,陈正汉.近岸海床边坡的稳定性及其分析方法探讨[J].四川建筑科学研究,2005,31(5):80~83.Zhang Wei,Chen Zhenghan.Stability and analytic methods of sea-bed slope by the shore.Building Science Research of Sichuan,2005,31(5):80~83.
[7]Hobst,L.and Zajic,J.Anchoring in rock and soil[M].2ed edi-tion.Elsevier Scientific Publishing Company.1983.
[8]Bromhead,E.N.The stability of slopes.2ed edition[M].SurreyUniversity Press,1994.
[9]顾小芸.海底边坡稳定分析方法综述[J].力学进展,1989,19(1):50~58.Gu Xiaoyun.Analytical methods of submarine slope stability.Ad-vances in Mechanics,1989,19(1):50~58.
[10]赵旭峰,王春苗.厦门海底隧道围岩稳定动态反演分析[J].工程地质学报,2007,15(2):228~232.Zhao Xufeng,Wang Chunmiao.Dynamic displacement back-a-nalysis on stability of surrounding rocks along Xiamen sub-seatunnel.Journal of Engineering Geology,2007,15(2):228~232.
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