均布荷载作用下的无黏性土地震被动土压力计算
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摘要
针对现有地震被动土压力计算方法的局限性与不足,在平面滑裂面假设下,提出采用拟动力法计算填土表面有均布荷载作用下的地震被动土压力,同时得到被动土压力沿墙高的分布曲线。通过分析墙土摩擦角、填土内摩擦角、水平向和竖向地震加速度系数对被动土压力值及其分布的影响,得出地震被动土压力随墙土摩擦角及填土内摩擦角的增大而增大,随水平向及竖向地震加速度的增大而减小。拟动力法计算得到的地震被动土压力值大于Mononobe-Okabe理论的计算值,且所得的地震被动土压力沿墙高呈非线性分布。
Based on the hypothesis of planar sliding surface,a modified pseudo-dynamic approach is proposed to overcome some shortage in method of seismic passive earth pressure calculation.The formulas are derived for the calculation of lateral earth pressure and total passive force under seismic condition by using pseudo-dynamic approach.The effects of wall friction angle,soil friction angle,horizontal and vertical seismic coefficients on the seismic passive force have been explored.The parametric study shows that the total seismic passive earth pressure increases with the increase in values of wall friction angle and soil friction angle;while it decreases with the increase in values of horizontal and vertical seismic coefficients.The calculation results of seismic passive force obtained from present analysis is larger than those obtained from Mononobe-Okabe theory.Unlike the Mononobe-Okabe theory,the present analysis predicts a nonlinear variation of passive earth pressure along the retaining wall.
Based on the hypothesis of planar sliding surface,a modified pseudo-dynamic approach is proposed to overcome some shortage in method of seismic passive earth pressure calculation.The formulas are derived for the calculation of lateral earth pressure and total passive force under seismic condition by using pseudo-dynamic approach.The effects of wall friction angle,soil friction angle,horizontal and vertical seismic coefficients on the seismic passive force have been explored.The parametric study shows that the total seismic passive earth pressure increases with the increase in values of wall friction angle and soil friction angle;while it decreases with the increase in values of horizontal and vertical seismic coefficients.The calculation results of seismic passive force obtained from present analysis is larger than those obtained from Mononobe-Okabe theory.Unlike the Mononobe-Okabe theory,the present analysis predicts a nonlinear variation of passive earth pressure along the retaining wall.
引文
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[15]GHOSH P.Seismic passive earth pressure behind non-vertical retaining wall using pseudo-dynamic analysis[J].Geotechnical and Geological Engineering,2007,25(6):693–703.
[2]VELETSOS A S,YOUNAN A H.Dynamic modeling and response of soil-wall system[J].Journal of Geotechnical and Geoenvironmental Engineering,1994,120(12):2 155–2 179.
[3]RICHARDS J R,HUANG C,FISHMAN K L.Seismic earth pressure on retaining structures[J].Journal of Geotechnical and Geoenvironmental Engineering,1999,125(9):771–778.
[4]OKABE S.General theory of earth pressure[J].Journal of the Japanese Society of Civil Engineers,1926,12(1):311.
[5]MONONOBE N,MATSUO H.On the determination of earth pressure during earthquakes[C]//Proceeding of the World Engineering Congress.Tokyo,Japan:[s.n.],1929:274–280.
[6]SARAN S,GUPTA R P.Seismic earth pressures behind retaining walls[J].Indian Geotechnical Journal,2003,33(3):195–213.
[7]王立强,王元战,迟丽华.挡土墙地震土压力及其分布[J].中国港湾建设,2007,(5):1–5.(WANG Liqiang,WANG Yuanzhan,CHI Lihua.Distribution of seismic soil pressure on a retaining wall[J].China Harbour Engineering,2007,(5):1–5.(in Chinese))
[8]RICHARDS R,SHI X.Seismic lateral pressures in soil with cohesion[J].Journal of Geotechnical Engineering,1994,120(7):1 230–1 251.
[9]SHUKLA S K,GUPTA S K,SIVAKUGAN N.Active earth pressure on retaining wall for c-?soil backfill under seismic loading condition[J].Journal of Geotechnical and Geoenvironmental Engineering,2009,135(5):690–696.
[10]STEEDMAN R S,ZENG X.The influence of phase on the calculation of pseudo-static earth pressure on a retaining wall[J].Geotechnique,1990,40(1):103–112.
[11]ZENG X,STEEDMAN R S.On the behavior of quay walls in earthquakes[J].Geotechnique,1993,43(3):417–431.
[12]CHOUDHURY D,NIMBALKAR S.Seismic passive resistance by pseudo-dynamic method[J].Geotechnique,2005,55(9):699–702.
[13]GHOSH P.Seismic active earth pressure behind a nonvertical retaining wall using pseudo-dynamic analysis[J].Canadian Geotechnical Journal,2008,45(1):117–123.
[14]DAS B M.Principles of soil dynamics[M].Boston,Massachusetts:PWS-KENT Publishing Company,1993:103–152.
[15]GHOSH P.Seismic passive earth pressure behind non-vertical retaining wall using pseudo-dynamic analysis[J].Geotechnical and Geological Engineering,2007,25(6):693–703.
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