基于极限分析上限方法的海底斜坡地震稳定性
|
摘要
极限分析上限方法在海底斜坡稳定性评价中受到了广泛关注,但已有成果未考虑地震荷载以及多土层海底斜坡可能出现的局部破坏机制。基于上限定理,推导了拟静力水平地震条件下多土层海底斜坡外力功率与内能耗散率平衡方程;结合强度折减技术和最优化方法,求解了海底斜坡整体和局部地震稳定性安全系数,并实现了多土层海底斜坡的局部滑动面搜索;通过典型算例分析,验证了本文方法的有效性。在此基础上,探讨了不同水平地震条件下两种组合土层海底斜坡的整体和局部稳定性,通过与数值解对比,其结果可以较准确地评价海底斜坡稳定性并有效预测滑移面位置。最后,将极限分析上限方法应用于一海底斜坡工程实例。。
The upper bound method of limit analysis has received extensive attention in the stability assessment of submarine slopes. However,the method has not take into account the seismic load and the possible local failure mechanism of multi-layered submarine slopes. Based on the upper bound theorem,we derive the equilibrium equation of power dissipation and internal energy dissipation rate of multi-layered submarine slopes under horizontal pseudo-static earthquake load. Combined with the strength reduction technique and the optimization method,we solve the global and local factors of safety of submarine slopes under different horizontal seismic coefficients,and successfully search the local sliding surfaces of multi-layered submarine slope. The analyses of typical examplesverify the effectiveness of the proposed method. On this basis,we discuss the global and local stability of submarine slopes with two typical combined soil layers under different earthquake conditions. By comparing with the numerical solution,we can accurately evaluate the stability of submarine slopes and effectively predict the position of critical slip surfaces. Finally,the improved method is applied to one case of submarine slope.
The upper bound method of limit analysis has received extensive attention in the stability assessment of submarine slopes. However,the method has not take into account the seismic load and the possible local failure mechanism of multi-layered submarine slopes. Based on the upper bound theorem,we derive the equilibrium equation of power dissipation and internal energy dissipation rate of multi-layered submarine slopes under horizontal pseudo-static earthquake load. Combined with the strength reduction technique and the optimization method,we solve the global and local factors of safety of submarine slopes under different horizontal seismic coefficients,and successfully search the local sliding surfaces of multi-layered submarine slope. The analyses of typical examplesverify the effectiveness of the proposed method. On this basis,we discuss the global and local stability of submarine slopes with two typical combined soil layers under different earthquake conditions. By comparing with the numerical solution,we can accurately evaluate the stability of submarine slopes and effectively predict the position of critical slip surfaces. Finally,the improved method is applied to one case of submarine slope.
引文
An C G,Zhang J H,Zhou M,et al.2011.Limit analysis on mechanism of low-angle submarine landslide based on upper bound energy method[J].Northwestern Seismological Journal,33(S):105-109.
Azizian A,Popescu R.2006.Three-dimensional seismic analysis of submarine slopes[J].Soil Dynamics&Earthquake Engineering,26(9):870-887.
Chu H X,Fang Z H,Shi H J,et al.2016.Analysis and evaluation on the slope stability of Caofeidian deep trough[J].The Ocean Engineering,34(3):114-122.
Deng D P,Li L.2012.Based on a new method of searching for sliding surface pseudo-static stability analysis of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,31(1):86-98.
Gu X Y.1989.State of the art:analytical methods of submarine slope stability[J].Advances in Mechanics,19(1):50-58.
Gu X Y.1996.Case study of clayed seabottom stability[J].Journal of Engineering Geology,4(1):32-38.
Kumar J,Samui P.2006.Stability determination for layered soil slopes using the upper bound limit analysis[J].Geotechnical&Geological Engineering,24(6):1803-1819.
Leynaud D,Mienert J,Nadim F.2004.Slope stability assessment of the Helland Hansen area offshore the mid-Norwegian margin[J].Marine Geology,213(1):457-480.
Locat J,Lee H J.2002.Submarine landslides:advances and challenges[J].Canadian Geotechnical Journal,39(1):193-212.
Nian T K,Liu K,Huang R Q,et al.2016a.Solutions for stability of anchored earth slopes subjected to seismic loading[J].Chinese Journal of Geotechnical Engineering,38(11):2009-2016.
Nian T K,Liu M,Liu B,et al.2016b.Stability analysis of clayey sloping seafloor under extreme wave loads[J].The Ocean Engineering,34(4):9-15.
Rodríguez-Ochoa R,Nadim F,Hicks M A.2015.Influence of weak layers on seismic stability of submarine slopes[J].Marine&Petroleum Geology,65(3):247-268.
Scholz N A,Riedel M,Urlaub M,et al.2016.Submarine landslides offshore Vancouver Island along the northern Cascadia margin,British Columbia:why preconditioning is likely required to trigger slope failure[J].Geo-Marine Letters,36(5):323-337.
Sloan S W.2013.Geotechnical stability analysis[J].Géotechnique,63(7):531-572.
Sultan N,Gaudin M,Berne S,et al.2007.Analysis of slope failures in submarine canyon heads:An example from the Gulf of Lions[J].Journal of Geophysical Research:Earth Surface,112(F1):547-564.
Urgeles R,Camerlenghi A.2013.Submarine landslides of the Mediterranean Sea:Trigger mechanisms,dynamics,and frequencymagnitude distribution[J].Journal of Geophysical Research-Earth Surface,118(4):2600-2618.
Viratjandr C,Michalowski R L.2006.Limit analysis of submerged slopes subjected to water drawdown[J].Canadian Geotechnical Journal,43(8):802-812.
Wright S G,Rathje E M.2003.Triggering Mechanisms of slope instability and their relationship to earthquakes and tsunamis[J].Pure&Applied Geophysics,160(10-11):1865-1877.
Xu W F,Che A L,Wang Z,et al.2011.Destruction characteristic of seabed landslide during earthquake motion and its mechanism[J].Journal of Shanghai Jiaotong University,45(5):782-787.
Xiu Z X,Liu L J,Li X S,et al.2016.Slope stability analysis of submarine canyon area along pipeline route of Liwan3~1 gasfield[J].Journal of Engineering Geology,24(4):535-541.
Zhu C Q,Jia Y G,Liu X L,et al.2015.Classification and genetic mechanism of submarine landslide:a review[J].Marine Geology&Quaternary Geology,35(6):153-163.
Zangeneh N.2003.Enhanced Newmark method for seismic analysis of submarine slopes[D].Newfoundland:Memorial University of Newfoundland.
安晨歌,张建红,周敏,等.2011.基于能量上限法的海底缓边坡滑坡机理分析[J].西北地震学报,33(增刊):105-109.
褚宏宪,方中华,史慧杰,等.2016.曹妃甸海底深槽斜坡稳定性分析与评价[J].海洋工程,34(3):114-122.
邓东平,李亮.2012.基于滑动面搜索新方法对地震作用下边坡稳定性拟静力分析[J].岩石力学与工程学报,31(1):86-98.
顾小芸.1989.海底边坡稳定分析方法综述[J].力学进展,19(1):50-59.
顾小芸.1996.黏质海底稳定性实例分析[J].工程地质学报,4(1):32-38.
年廷凯,刘凯,黄润秋,等.2016a.地震作用下锚固土质边坡稳定性解析[J].岩土工程学报,38(11):2009-2016.
年廷凯,刘敏,刘博,等.2016b.极端波浪条件下黏土质斜坡海床稳定性解析[J].海洋工程,34(4):9-15.
许文锋,车爱兰,王治,等.2011.地震荷载作用下海底滑坡特征及其机理[J].上海交通大学学报,45(5):782-786.
修宗祥,刘乐军,李西双,等.2016.荔湾3-1气田管线路由海底峡谷段斜坡稳定性分析[J].工程地质学报,24(4):535-541.
朱超祁,贾永刚,刘晓磊,等.2015.海底滑坡分类及成因机制研究进展[J].海洋地质与第四纪地质,35(6):153-163.
Azizian A,Popescu R.2006.Three-dimensional seismic analysis of submarine slopes[J].Soil Dynamics&Earthquake Engineering,26(9):870-887.
Chu H X,Fang Z H,Shi H J,et al.2016.Analysis and evaluation on the slope stability of Caofeidian deep trough[J].The Ocean Engineering,34(3):114-122.
Deng D P,Li L.2012.Based on a new method of searching for sliding surface pseudo-static stability analysis of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,31(1):86-98.
Gu X Y.1989.State of the art:analytical methods of submarine slope stability[J].Advances in Mechanics,19(1):50-58.
Gu X Y.1996.Case study of clayed seabottom stability[J].Journal of Engineering Geology,4(1):32-38.
Kumar J,Samui P.2006.Stability determination for layered soil slopes using the upper bound limit analysis[J].Geotechnical&Geological Engineering,24(6):1803-1819.
Leynaud D,Mienert J,Nadim F.2004.Slope stability assessment of the Helland Hansen area offshore the mid-Norwegian margin[J].Marine Geology,213(1):457-480.
Locat J,Lee H J.2002.Submarine landslides:advances and challenges[J].Canadian Geotechnical Journal,39(1):193-212.
Nian T K,Liu K,Huang R Q,et al.2016a.Solutions for stability of anchored earth slopes subjected to seismic loading[J].Chinese Journal of Geotechnical Engineering,38(11):2009-2016.
Nian T K,Liu M,Liu B,et al.2016b.Stability analysis of clayey sloping seafloor under extreme wave loads[J].The Ocean Engineering,34(4):9-15.
Rodríguez-Ochoa R,Nadim F,Hicks M A.2015.Influence of weak layers on seismic stability of submarine slopes[J].Marine&Petroleum Geology,65(3):247-268.
Scholz N A,Riedel M,Urlaub M,et al.2016.Submarine landslides offshore Vancouver Island along the northern Cascadia margin,British Columbia:why preconditioning is likely required to trigger slope failure[J].Geo-Marine Letters,36(5):323-337.
Sloan S W.2013.Geotechnical stability analysis[J].Géotechnique,63(7):531-572.
Sultan N,Gaudin M,Berne S,et al.2007.Analysis of slope failures in submarine canyon heads:An example from the Gulf of Lions[J].Journal of Geophysical Research:Earth Surface,112(F1):547-564.
Urgeles R,Camerlenghi A.2013.Submarine landslides of the Mediterranean Sea:Trigger mechanisms,dynamics,and frequencymagnitude distribution[J].Journal of Geophysical Research-Earth Surface,118(4):2600-2618.
Viratjandr C,Michalowski R L.2006.Limit analysis of submerged slopes subjected to water drawdown[J].Canadian Geotechnical Journal,43(8):802-812.
Wright S G,Rathje E M.2003.Triggering Mechanisms of slope instability and their relationship to earthquakes and tsunamis[J].Pure&Applied Geophysics,160(10-11):1865-1877.
Xu W F,Che A L,Wang Z,et al.2011.Destruction characteristic of seabed landslide during earthquake motion and its mechanism[J].Journal of Shanghai Jiaotong University,45(5):782-787.
Xiu Z X,Liu L J,Li X S,et al.2016.Slope stability analysis of submarine canyon area along pipeline route of Liwan3~1 gasfield[J].Journal of Engineering Geology,24(4):535-541.
Zhu C Q,Jia Y G,Liu X L,et al.2015.Classification and genetic mechanism of submarine landslide:a review[J].Marine Geology&Quaternary Geology,35(6):153-163.
Zangeneh N.2003.Enhanced Newmark method for seismic analysis of submarine slopes[D].Newfoundland:Memorial University of Newfoundland.
安晨歌,张建红,周敏,等.2011.基于能量上限法的海底缓边坡滑坡机理分析[J].西北地震学报,33(增刊):105-109.
褚宏宪,方中华,史慧杰,等.2016.曹妃甸海底深槽斜坡稳定性分析与评价[J].海洋工程,34(3):114-122.
邓东平,李亮.2012.基于滑动面搜索新方法对地震作用下边坡稳定性拟静力分析[J].岩石力学与工程学报,31(1):86-98.
顾小芸.1989.海底边坡稳定分析方法综述[J].力学进展,19(1):50-59.
顾小芸.1996.黏质海底稳定性实例分析[J].工程地质学报,4(1):32-38.
年廷凯,刘凯,黄润秋,等.2016a.地震作用下锚固土质边坡稳定性解析[J].岩土工程学报,38(11):2009-2016.
年廷凯,刘敏,刘博,等.2016b.极端波浪条件下黏土质斜坡海床稳定性解析[J].海洋工程,34(4):9-15.
许文锋,车爱兰,王治,等.2011.地震荷载作用下海底滑坡特征及其机理[J].上海交通大学学报,45(5):782-786.
修宗祥,刘乐军,李西双,等.2016.荔湾3-1气田管线路由海底峡谷段斜坡稳定性分析[J].工程地质学报,24(4):535-541.
朱超祁,贾永刚,刘晓磊,等.2015.海底滑坡分类及成因机制研究进展[J].海洋地质与第四纪地质,35(6):153-163.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |