有地下水时刚性挡土墙的动主动土压力
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摘要
基于Mononobe-Okabe假定,在合理考虑土体孔隙中受限水含量的基础上,利用水平层分析法推导了填土中有地下水时刚性挡土墙平移模式下的动主动土压力强度的一阶微分方程,并求得非线性分布解;探讨了地下水位、受限水含量、填土的内摩擦角、墙背的摩擦角和地震系数等参数对土压力强度分布、合力作用点高度以及倾覆力矩的影响。所提出的方法可考虑填土的孔隙率、渗透性和地震动周期的影响。
Based on Mononobe-Okabe’s postulation and the reasonable consideration for the restricted pore water,a first-order differential equation of the dynamic active earth pressure on rigid retaining walls with submerged backfills in the translational movement mode under earthquake loads is set up by using the method of level-layer analysis.And the theoretical answers to the nonlinear distribution of the dynamic active earth pressures are obtained.The analytical results indicate that some parameters such as the groundwater level,the content of restricted pore water,the internal friction angle of backfills,the angle of wall friction and the earthquake coefficient have influence on the distribution of the dynamic earth pressure,the application point of the resultant earth pressure and the overturning moment.The present procedure incorporates the effect of the porosity and the permeability of backfills and the period of ground vibration.
Based on Mononobe-Okabe’s postulation and the reasonable consideration for the restricted pore water,a first-order differential equation of the dynamic active earth pressure on rigid retaining walls with submerged backfills in the translational movement mode under earthquake loads is set up by using the method of level-layer analysis.And the theoretical answers to the nonlinear distribution of the dynamic active earth pressures are obtained.The analytical results indicate that some parameters such as the groundwater level,the content of restricted pore water,the internal friction angle of backfills,the angle of wall friction and the earthquake coefficient have influence on the distribution of the dynamic earth pressure,the application point of the resultant earth pressure and the overturning moment.The present procedure incorporates the effect of the porosity and the permeability of backfills and the period of ground vibration.
引文
[1]Ishibashi I,Fang YS.Dynamic earth pressures with different wall movement modes[J].Soils and Foundations,1987,27(4):11-22.
[2]Richards R,Huang C,and Fishman KL.Seismic earth pressure on retaining structures[J].Journal of Geotechnical and Geoenvironmental Engineering,1999,125(9):771-778.
[3]Wu GX,Fin WDL.Seismic lateral pressures for design of rigid walls[J].Canadian Geotechanical Journal,1999,36:509-522.
[4]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[5]刘惠姗,张在明.地震区的场地与地基基础[M].北京:中国建筑工业出版社,1994.
[6]刘忠玉,杨会朋,何盛东.刚性挡土墙地震主动土压力的非线性分布[J].郑州大学学报(工学版,)2004,25(2):36-38.LIU Zhong-yu,YANG Hui-peng,HE Sheng-dong.Nonlinear distribution of seismic active earth pressure on rigid retaining walls[J].Journal of Zhengzhou University(Engineering Science),2004,25(2):36-38.
[7]Matsuzawa H,Ishibashi I,Kawamura M.Dynamic soil and water pressures of submerged soils[J].Journal of Geotechnical Engineering,ASCE,1985,111(10):1 161-1 176.
[8]Wu Yingwei,Prakash S.Effect of submergence on seismic displacements of rigid retaining walls[A].Earthquake Geotechanical Engineering[C].Pinto P S.Rotterdam:Balkema,1999.277-283.
[2]Richards R,Huang C,and Fishman KL.Seismic earth pressure on retaining structures[J].Journal of Geotechnical and Geoenvironmental Engineering,1999,125(9):771-778.
[3]Wu GX,Fin WDL.Seismic lateral pressures for design of rigid walls[J].Canadian Geotechanical Journal,1999,36:509-522.
[4]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[5]刘惠姗,张在明.地震区的场地与地基基础[M].北京:中国建筑工业出版社,1994.
[6]刘忠玉,杨会朋,何盛东.刚性挡土墙地震主动土压力的非线性分布[J].郑州大学学报(工学版,)2004,25(2):36-38.LIU Zhong-yu,YANG Hui-peng,HE Sheng-dong.Nonlinear distribution of seismic active earth pressure on rigid retaining walls[J].Journal of Zhengzhou University(Engineering Science),2004,25(2):36-38.
[7]Matsuzawa H,Ishibashi I,Kawamura M.Dynamic soil and water pressures of submerged soils[J].Journal of Geotechnical Engineering,ASCE,1985,111(10):1 161-1 176.
[8]Wu Yingwei,Prakash S.Effect of submergence on seismic displacements of rigid retaining walls[A].Earthquake Geotechanical Engineering[C].Pinto P S.Rotterdam:Balkema,1999.277-283.
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