在边坡局部失稳中传递系数法与强度折减法的计算比较
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摘要
在考虑非饱和基质吸力条件下,基于传递系数法的计算原理,开发了可考虑基质吸力的传递系数法相关计算程序,并且针对下土地岭边坡进行了稳定性分析,同时与强度折减有限元计算结果进行了比较研究。对于具有滑带、坡体狭长不规则等特点的下土地岭边坡,可能存在局部滑动先于沿整体滑带滑动的失稳情况。研究结果表明,考虑基质吸力逐步减弱直至丧失的过程中,传递系数法与强度折减有限元法均可在一定程度上反映非饱和土边坡的安全系数降低的现象,但传递系数法在分析边坡的局部滑动问题中具有明显的局限性,而强度折减有限元法则可以通过计算的位移增量云图和等值线确定潜在的局部滑动面。
In the condition of taking the unsaturated matric suction into consideration,based on the principle of the traditional transfer coefficient method,this paper develops a corresponding program on transfer coefficient method with considering matric suction,and analyzes the stability of Tudiling slope.At the same time,comparison of the results of the transfer coefficient method is made with that of the strength reduction finite element method.For the Tudiling slope being narrow in thickness and irregular in shape,there may exist a kind of instability that the sliding of local surface is earlier than that of whole slide belt.The results show that,with matric suction gradually decreasing,the transfer coefficient method and the strength reduction finite element method both can reflect the decrease of safety factor in the unsaturated soil slope,but the transfer coefficient method has obvious difficulty in analyzing the local sliding,while the strength reduction finite element method is advantageous to determine the potential local sliding surface through the isoclines of incremental displacement.
In the condition of taking the unsaturated matric suction into consideration,based on the principle of the traditional transfer coefficient method,this paper develops a corresponding program on transfer coefficient method with considering matric suction,and analyzes the stability of Tudiling slope.At the same time,comparison of the results of the transfer coefficient method is made with that of the strength reduction finite element method.For the Tudiling slope being narrow in thickness and irregular in shape,there may exist a kind of instability that the sliding of local surface is earlier than that of whole slide belt.The results show that,with matric suction gradually decreasing,the transfer coefficient method and the strength reduction finite element method both can reflect the decrease of safety factor in the unsaturated soil slope,but the transfer coefficient method has obvious difficulty in analyzing the local sliding,while the strength reduction finite element method is advantageous to determine the potential local sliding surface through the isoclines of incremental displacement.
引文
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[17]李荣建,郑文,邵生俊,等.非饱和土边坡稳定分析中强度折减法与条分法的比较[J].西北农林科技大学报:自然科学版,2010,8(9):207-214.Li Rongjian,Zheng Wen,Shao Shengjun,et al.Compar-ison analyses on stability of unsaturated soil slopes bystrength reduction FEM and slice method[J].NortwhestAgriculture&Forestry University(Natural Science Edi-tion),2010,8(9):207-214.
[18]李荣建,郑文,王莉平,等.非饱和土边坡稳定性分析方法研究进展[J].西北地震学报,2011,33(S2):322-326.Li Rongjian,Zheng Wen,Wang Liping,et al.Progressand developing trend on stability analyses of unsaturatedsoil slope[J].Northwestern Seismological Journal,2011,33(S2):322-326.
[19]王恭先.滑坡防治100例[M].北京:人民交通出版社,2008.
[2]石振峰,何钦象,田小红.导流泄洪洞强度计算及边坡稳定分析[J].西安理工大学学报,2010,26(4):454-458.Shi Zhenfeng,He Qinxiang,Tian Xiaohong.Strength cal-culation and slope stability analysis of diversion and spill-way tunnel[J].Journal of Xi’an University of Technology,2010,26(4):454-458.
[3]郭璇,赵成刚,于威威.非饱和土边坡稳定的安全分析及进展[J].中国安全科学学报,2005,15(1):14-18.Guo Xuan,Zhao Chenggang,Yu Weiwei.Stability analysisof unsaturated soil slope and its progress[J].China SafetyScience Journal,2005,15(1):14-18.
[4]Bishop A W,Blight G E.Some aspects of effective stressin saturated and unsaturated soil[J].Geotechnique,1963,13(3):177-197.
[5]Fredlund D G,Morgenstern N R,Widger A.Shearstrength of unsaturated soils[J].Canadian GeotechnicalJournal,1978,15:313-321.
[6]Fredlund D G,Rahardjo H.Soil mechanics for unsaturatedsoils[M]Wiley,NewYork,1993.
[7]蒋刚,林鲁生,刘祖德,等.考虑非饱和土强度的边坡稳定分析方法及应用[J].岩石力学与工程学报,2001,20(增1):1070-1074.Jiang Gang,Lin Lusheng,Liu Zude,et al.Analysis methodfor slope stability considering unsaturated soil strength andits application[J].Chinese Journal of Rock Mechanics andEngineering,2001,20(S1):1070-1074.
[8]李荣建,于玉贞,李广信.强度折减有限元法在非饱和土边坡稳定分析中的应用[J].水利水电技术,2006,37(3):42-45.Li Rongjian,YuYuzhen,Li Guangxin.Application ofstrength reduction FEM to analysis on stability of unsaturat-ed soil slope[J].Water Resources and Hydro power Engi-neering,2006,37(3):42-45.
[9]Zienkiewicz O C,Humpheson C,Lewis R W.Associatedand nonassociated visco-plasticity and plasticity in soil me-chanics[J].Geotechnique,1975,25(4):691-689.
[10]Ugai K.A method of calculation of total factor of safety ofslopes by elasto-plastic FEM[J].Soils and Foundations,1989,29(2):190-195.
[11]Griffths D V,Lane P A:slope stability analysis by finiteelement[J].Geotechnique,1999,49(3):387-403.
[12]宋二祥.土工结构安全系数的有限元计算[J].岩土工程学报,1997,19(2):1-7.Song Erxiang.Finite element analysis of safety factor forsoil structures[J].Chinese Journal of Geotechnical Engi-neering,1997,19(2):1-7.
[13]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M].北京:人民交通出版,2007:240-243.
[14]Li Rongjian,Yu Yuzhen,Deng Lijun,et al.Stability a-nalysis of unsaturated soil slope by 3-D strength reductionFEM[C]∥Applied Unsaturated Soil Mechanics inGeotechnical Engineering,ShangHai,2006,148:62-69.
[15]李荣建,于玉贞,邓丽军,等.非饱和土边坡稳定分析方法探讨[J].岩土力学,2007,28(10):2060-2064.Li Rongjian,Yu Yuzhen,Deng Lijun,et al.Discussionon stability analysis of unsaturated soil slopes[J].Rockand Soil Mechanics,2007,28(10):2060-2064.
[16]李荣建,郑文,邵生俊,等.云阳龙洞抗滑桩加固边坡局部失稳机制研究[J].岩土力学,2010,31(S2):322-326.Li Rongjian,Zheng Wen,Shao Shengjun,et al.Analysisof local sliding mechanism of Longdong slope reinforcedwith stabilizing piles[J].Rock and Soil Mechanics,2010,31(S2):322-326.
[17]李荣建,郑文,邵生俊,等.非饱和土边坡稳定分析中强度折减法与条分法的比较[J].西北农林科技大学报:自然科学版,2010,8(9):207-214.Li Rongjian,Zheng Wen,Shao Shengjun,et al.Compar-ison analyses on stability of unsaturated soil slopes bystrength reduction FEM and slice method[J].NortwhestAgriculture&Forestry University(Natural Science Edi-tion),2010,8(9):207-214.
[18]李荣建,郑文,王莉平,等.非饱和土边坡稳定性分析方法研究进展[J].西北地震学报,2011,33(S2):322-326.Li Rongjian,Zheng Wen,Wang Liping,et al.Progressand developing trend on stability analyses of unsaturatedsoil slope[J].Northwestern Seismological Journal,2011,33(S2):322-326.
[19]王恭先.滑坡防治100例[M].北京:人民交通出版社,2008.
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