散体材料对圆弧形外凸挡墙的主动侧压力  

Granular-material-induced active lateral pressures on convex-arc walls

作　　者：马崇武[1] 慕青松[2] 蒋红英[3] 

机构地区：[1]东莞理工学院建筑工程系,东莞523808 [2]兰州大学土木工程与力学学院,兰州730000 [3]兰州理工大学土木工程学院,兰州730050

出　　处：《岩土力学》2010年第3期794-798,共5页Rock and Soil Mechanics

基　　金：东莞市科研发展专项基金项目(No2005D046);中国自然科学基金青年基金(No10402012);兰州理工大学专项基金(NoSB04200701)

摘　　要：应用极限平衡理论,假定圆弧形外凸挡土墙任意深度对应的滑移楔同时达到极限平衡条件,并恰当考虑滑移楔2个径向侧面上正压力(内力)的影响,建立了一个计算无黏性散体材料对圆弧形挡土墙侧压力的理论方法,能够适合墙后散料锥堆和平堆两种情况。该方法给出了侧压力随深度的非线性分布特征,与试验相符,并能够预测出当忽略滑移楔2个径向侧面上的正压力时,会导致理论值相比实测值偏小,将理论曲线与实测数据对照,证实了这一预测。当恰当考虑滑移楔2个径向侧面上的正压力时,能够使理论曲线与实测数据符合良好。Based on the limit equilibrium theory, assuming that the limit equilibrium conditions of the slip wedges with respect to the all depths behind a convex-arc wall can synchronously be satisfied, as well as befittingly considering the effect of the normal stresses on the two sides of per slip wedge with respect to per depth; an improved computational method that can be used to calculate the distribution of the granular material pressure on the convex-arc wall with increasing depth is proposed. The computational method can present the nonlinear distributional characteristic ofthe granular material pressure, and can also predict that ignoring the normal stresses on the two sides of per slip wedge with respect to per depth will result in a lower calculated pressure distribution compared with the measured pressure data, which is proved to be correct via comparing the theoretic pressure curve with the measured pressure data; moreover, the theoretic pressure curve can agree well with the test data as it is considered correctly in calculation that the effect of the normal stresses on the two sides of per slip wedge with respect to per depth.

关 键 词：圆弧形外凸挡土墙 散体材料 极限平衡条件 滑移楔 主动侧压力 

分 类 号：TU476.4[建筑科学—结构工程] TU313.3[建筑科学—土工工程]