基于Meyerhof理论的临坡地基极限承载力简化分析方法
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摘要
针对现有临坡地基承载力研究方法中采用竖向均布作用力代替基础埋深影响而不能充分考虑埋深内土体抗剪强度贡献的问题,引入Meyerhof理论.首先,基于临坡条形基础地基的工程特点,通过研究其破坏机理,构建出考虑临坡条形基础埋深内土体抗剪强度作用的单侧滑移破坏模式.然后,在此破坏模式研究基础上,基于Meyerhof理论求解基础埋深内土体抗剪强度影响作用的思路,通过引入刚体极限平衡分析方法,导出了能够反映临坡条形基础埋深内土体抗剪强度作用、基础距坡顶距离、基础两侧埋置深度不同以及基础两侧侧壁与土体摩擦作用影响的临坡条形基础地基极限承载力简化计算公式,较已有研究成果计算方法更简便,更具工程适用性.最后,通过工程实例计算分析并与现有研究分析方法对比分析,表明了本研究方法的可行性与合理性.
In the existing research methods for determining the ultimate bearing capacity of foundation near Slope,the vertical uniform force instead of embedded depth of foundation was adopted,which did not consider the contribution of the soil shear strength in depth enough.In view of the problems,the Meyerhof Theory was introduced.First of all,based on the engineering characteristics of strip footing,the failure mechanism of strip footing near slope was thoroughly analyzed.Meanwhile,the new unilateral sliding failure mode considering the soil shear strength in the strip footing embedded depth of foundation adjacent to slope was established for further in-depth study of the method for determining the bearing capacity of strip footing near slope.Then,on the basis of the failure mode,the ultimate bearing capacity analysis model of strip footing adjacent to slope was derived in the rigid body limit equilibrium analysis method,based on the Meyerhof theory to solve the impact of the soil shear strength in depth.The method reflects not only the soil shear strength in depth,the distance effect from the top of the slope,different embedment depth on both sides of the footing,but also the friction effect between the wall of strip footing and the soil in depth.The simplified calculation formula is simpler and engineering applicative,compared with the existing research results.Finally,the feasibility and rationality of the proposed approach were shown through an engineering example calculation and comparison with current research results.
引文
[1]TERZAGHI K,PECK R B.Soil mechanics in engineering practice[M].New York:John Wiley and Sons,1967:258-262.
    [2]MEYERHOF G G.The ultimate bearing capacity of foundations[J].Geotechnique,1951,2:301-331.
    [3]HANSEN J B.A revised and extended formula for Bearing capacity[R].Copenhagen:Bulletin of the Danish Geotechnical Institute,1970:5-11.
    [4]VESIC A S.Analysis of ultimate loads of shallow foundations[J].JSMFD,ASCE,1973,99(1):45-73.
    [5]BOWLES J E.Analytical and computer methods in foundation engineering[M].New York:Mc Graw-Hill Book Company,1974:62-66.
    [6]SWAMI S,SUD V K,HANDA S C.Bearing capacity of footings adjacent to slopes[J].Journal of Geotechnical Engineering,ASCE,1989,115(4):553-573.
    [7]CHEN W F.Limit analysis and soil plasticity[M].Amsterdam:Elsevier,1975:30-90.
    [8]SOKOLOVSK V V.Statics of soil media[M].Pergamon Press,1965:48-111.
    [9]王晓谋,徐守国.斜坡上的地基承载力的有限元分析[J].西安公路学院学报,1993,13(3):13-17.WANG Xiao-mou,XU Shou-guo.FEM analysis of bearing capacity of foundation on slopes[J].Journal of Xi'an Highway Transportation University,1993,13(3):13-17.(In Chinese)
    [10]GRAHAM J,ANDREWS M,SHEILDS D H.Stress characteristics for shallow footings in cohesionless slopes[J].Canadian Geotechnical Journal,1988,25(2):238-249.
    [11]GEMPERLINE M C.Vehicle induced loads on fractal road surfaces[D].Fort Collins:Colorado State University,1994.
    [12]尉学勇,王晓谋,怀超.斜坡地基极限承载力上限解计算与分析[J].岩土工程学报,2010,32(3):381-387.WEI Xue-yong,WANG Xiao-mou,HUAI Chao.Calculation and analysis of upper limit solution of ultimate bearing capacity of sloping ground[J].Chinese Journal of Geotechnical Engineering,2010,32(3):381-387.(In Chinese)
    [13]王红雨,杨敏.基坑附近既有建筑物地基承载力减损的估算[J].土木工程学报,2005,38(8):95-101.WANG Hong-yu,YANG Min.An estimate for the loss of bearing capacity of the footing near excavations[J].China Civil Engineering Journal,2005,38(8):95-101.(In Chinese)
    [14]酆庆增.临近边坡的基础的极限承载力[J].上海力学,1999,20(1):24-27.FENG Qing-zeng.Ultimate bearing capacity of the foundation near a slope[J].Shanghai Journal of Mechanics,1999,20(1):24-27.(In Chinese)
    [15]赵炼恒,罗强,杨峰,等.临坡条形基础极限承载力上限计算[J].武汉理工大学学报,2010,34(1):84-87.ZHAO Lian-heng,LUO Qiang,YANG Feng,et al.Bearing capacity of strip footing adjacent to slope with upper bound theorem[J].Journal of Wuhan University of Technology,2010,34(1):84-87.(In Chinese)
    [16]杨峰,阳军生,张学民,等.斜坡地基单侧滑移破坏模式及承载力上限解[J].工程力学,2010,27(6):162-168.YANG Feng,YANG Jun-sheng,ZHANG Xue-min,et al.One-side slip failure mechanism and upper bound solution for bearing capacity of foundation on slope[J].Engineering Mechanics,2010,27(6):162-168.(In Chinese)
    [17]YANG X L,WANG Z B,ZOU J F,et al.Bearing capacity of foundation on slope determined by energy dissipation method and model experiments[J].Journal of Central South University of Technology,2007,14(1):125-128.
    [18]陈昌富,唐仁华,唐谚哲.邻近斜坡地基地震承载力计算新方法[J].湖南大学学报:自然科学版,2008,35(4):1-6.CHEN Chang-fu,TANG Ren-hua,TANG Yan-zhe.A new calculation method for the seismic bearing capacity of shallow strip footings close to slope[J].Journal of Hunan University:Natural Sciences,2008,35(4):1-6.(In Chinese)
    [19]王红雨,杨敏.极限荷载作用下临近基坑c-φ土地基的破坏模式[J].岩土力学,2007,28(8):1677-1681.WANG Hong-yu,YANG Min.Analysis of c-φsoils failure zone of footings near excavations under ultimate load[J].Rock and Soil Mechanics,2007,28(8):1677-1681.(In Chinese)
    [20]潘家峥.建筑物的抗滑稳定和滑坡分析[M].北京:水利出版社,1980:23-59.PAN Jia-zheng.Anti-sliding stability and landslide analysis of the structure[M].Beijing:The Hydraulic Press,1980:23-59.(In Chinese)
    [21]杨扬,卢坤林,朱大勇,等.基于极限平衡法与极限分析法等效性的地基承载力系数Nγ的上限解[J].工业建筑,2013,43(2):72-77.YANG Yang,LU Kun-lin,ZHU Da-yong,et al.The upperbound solution for bearing capacity factor of by employing the equivalence of limit analysis and limit equilibrium method[J].Industrial Construction,2013,43(2):72-77.(In Chinese)
    [22]曹文贵,刘海涛,张永杰.散体材料桩复合地基桩土应力比计算新方法[J].湖南大学学报:自然科学版,2009,36(7):1-5.CAO Wen-gui,LIU Hai-tao,ZHANG Yong-jie.A new pilesoil stress ratio calculation method of composite foundation with friable material piles[J].Journal of Hunan University:Natural Sciences,2009,36(7):1-5.(In Chinese)

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