摘要
孔隙水是影响土体稳定性的主要因素。本文将孔隙水压力视为外力作用在土体上,采用极限分析上限定理推导出孔隙水效应下主动土压力的解析解,并且采用穷举法得到了主动土压力的最大值以及最危险破裂面。研究表明:土体的抗剪强度指标、地表荷载、孔隙水对挡土墙的主动土压力以及土体潜在破裂面的位置有显著影响,其中孔隙水的影响最大,建议在实际工程中进行防排水设计,尽量减小孔隙水的影响。
Pore water is a main factor of affecting the soil stability. The pore water pressure is regarded as an external force acting on the soil. The analytical solution of active earth pressure under the effect of pore water is derived with the upper bound theorem, and the maximum of active earth pressure and the most dangerous failure surface are obtained by the exhaustive method. The results show that the shear strength index of soil, surface load and pore water have significant effects on the active earth pressure and the location of potential failure surface. It is suggested that waterproof and drainage design should be carried out, and the influence of pore water should be minimized in actual projects.
引文
[1]彭明祥.挡土墙主动土压力的库仑统一解[J].岩土力学,2009,30(2):1 783-1 788.
[2]廖俊展,苗峰.基于上限分析法的有限宽度土体土压力计算[J].地下空间与工程学报,2016,12(z2):577-581.
[3]刘洋,于鹏强.刚性挡土墙平移模式的土拱形状与主动土压力分析[J].岩土力学,2019,40(2):1-12.
[4]杨贵,王阳阳,刘彦辰.基于曲线滑裂面的挡墙主动土压力分析[J].岩土力学,2017,38(8):2 182-2 188.
[5]芮瑞,叶雨秋,陈成,等.考虑墙壁摩擦影响的挡土墙主动土压力非线性分布研究[J].岩土力学,2019,40(5):1-8.
[6]Lin Y,Leng W,Yang G,et al.Seismic active earth pressure of cohesive-frictional soil on retaining wall based on a slice analysis method[J].Soil Dynamics and Earthquake Engineering,2015,70:133-147.
[7]Huang F,Zhang D,Sun Z,et al.Influence of pore water pressure on upper bound analysis of collapse shape for square tunnel in Hoek-Brown media[J].Journal of Central South University of Technology,2011,18(2):530-535.
[8]J H Shin.Analytical and combined numerical methods evaluating pore water pressure on tunnels[J].Géotechnique,2010,60(2):141-145.
[9]A W Bishop.The use of the slip circle in the stability analysis of slopes[J].Géotechnique,1955,5(1):7-17.
[10]R L Michalowski,S S Nadukuru.Three-dimensional limit analysis of slopes with pore pressure[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(9):1 604-1 610.
[11]Zhang J,Li Y,Xu J.Energy analysis of face stability of deep rock tunnels using nonlinear Hoek-Brown failure criterion[J].Journal of Central South University,2015,22(8):3 079-3 086.
[12]Pan Q,D Dias.The effect of pore water pressure on tunnel face stability[J].International Journal for Numerical and Analytical Methods in Geomechanics,2016,40(15):2 123-2 136.
[13]W F Chen.Limit analysis and soil plasticity[M].Florida:J.Ross Publishing,Inc,2007.