地震条件下挡墙后黏性土主动土压力研究
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摘要
采用水平层分析法,得到了地震条件下挡墙后黏性土主动土压力合力和作用点位置、土压力强度分布以及临界破裂角的解析解。公式考虑了水平和垂直地震加速度、挡墙墙背倾角、填料黏聚力和内摩擦角、填料与墙背的黏结力和外摩擦角、均布超载等因素,并分析了这些因素对主动土压力的影响。结果表明,朗肯和库伦理论下的主动土压力公式以及Mononobe-Okabe主动土压力公式与地震条件下的主动土压力公式完全一致。地震条件下的主动土压力强度沿墙高呈非线性分布。水平地震加速度增大了主动土压力,垂直地震加速度使得主动土压力有所减小。
Horizontal slices method is adopted to deduce active earth pressure formulas of cohesive soil under seismic condition;and analytical solutions of resultant force of active earth pressure and its application position,distribution of earth pressure and critical rupture angle are obtained.The influential factors of horizontal and vertical seismic accelerations,dip angle of wall back,cohesion and internal friction angle of filler,cohesion and external friction angle between filler and wall back and uniform distributed overloading are considered and analyzed.Results show that active earth pressure formula under seismic condition is the same as that obtained by Rankine theory,Coulomb theory or Mononobe-Okabe theory.The distribution of active earth pressure along wall back is nonlinear.Horizontal seismic acceleration increases active earth pressure while vertical seismic acceleration makes active earth pressure decrease.
Horizontal slices method is adopted to deduce active earth pressure formulas of cohesive soil under seismic condition;and analytical solutions of resultant force of active earth pressure and its application position,distribution of earth pressure and critical rupture angle are obtained.The influential factors of horizontal and vertical seismic accelerations,dip angle of wall back,cohesion and internal friction angle of filler,cohesion and external friction angle between filler and wall back and uniform distributed overloading are considered and analyzed.Results show that active earth pressure formula under seismic condition is the same as that obtained by Rankine theory,Coulomb theory or Mononobe-Okabe theory.The distribution of active earth pressure along wall back is nonlinear.Horizontal seismic acceleration increases active earth pressure while vertical seismic acceleration makes active earth pressure decrease.
引文
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[2]李巨文,王翀,梁永朵,等.挡土墙后黏性土的主动土压力计算[J].岩土工程学报,2006,28(5):650-652.LI Ju-wen,WANG Chong,LIANG Yong-duo,et al.Computation of earth pressure of cohesive backfill on retaining wall[J].Chinese Journal of Geotechnical Engineering,2006,28(5):650-652.
[3]刘忠玉,闫富有.有地下水时刚性挡土墙的动主动土压力[J].岩土力学,2006,27(4):566-570.LIU Zhong-yu,YAN Fu-you.Dynamic active earth pressure on rigid retaining walls with submerged soils[J].Rock and Soil Mechanics,2006,27(4):566-570.
[4]杨剑,高玉峰,程永锋,等.地震条件下倾斜挡土墙被动土压力的研究[J].岩土工程学报,2009,31(9):1391-1397.YANG Jian,GAO Yu-feng,CHENG Yong-feng,et al.Passive earth pressure of inclined retaining walls under seismic condition[J].Chinese Journal of Geotechnical Engineering,2009,31(9):1391-1397.
[5]SHAHGHOLI M,FAKHER A,JONES C J F P.Hori-zontal slice method of analysis[J].Geotechnique,2001,51(10):881-885.
[6]WANG Y Z.Distribution of earth pressure on a retaining wall[J].Geotechnique,2000,50(1):83-88.
[7]林宇亮,杨果林,赵炼恒,等.地震动土压力水平层分析法[J].岩石力学与工程学报,2010,29(12):2581-2591.LIN Yu-liang,YANG Guo-lin,ZHAO Lian-heng,et al.Horizontal slices analysis method for seismic earth pressure calculation[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2581-2591.
[8]林宇亮,杨果林,黄向京.挡墙后黏性土被动土压力的薄层微元法[J].公路交通科技,2011,28(3):12-19.LIN Yu-liang,YANG Guo-lin,HUANG Xiang-jing.Thin-layer micro-element method for computing passive earth pressure of backfilled cohesive soil on retaining wall[J].Journal of Highway and Transportation Research and Development,2011,28(3):12-19.
[9]王渭漳,吴亚中.墙背土压力分布计算的新理论及其工程应用[M].北京:人民交通出版社,1996.
[10]王云球.黏性土地震土压力的计算方法[J].水运工程,1980,(8):7-13.
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