Calculation of passive earth pressure of cohesive soil based on Culmann's method

Based on the sliding plane hypothesis of Coulumb earth pressure theory, a new method for calculation of the passive earth pressure of cohesive soil was constructed with Culmann＇s graphical construction. The influences of the cohesive force, adhesive force, and the fill surface form were considered in this method. In order to obtain the passive earth pressure and sliding plane angle, a program based on the sliding surface assumption was developed with the VB.NET programming language. The calculated results from this method were basically the same as those from the Rankine theory and Coulumb theory formulas. This method is conceptually clear, and the corresponding formulas given in this paper are simple and convenient for application when the fill surface form is complex.

改进的库尔曼图解法及其在土压力计算中的应用

对库尔曼图解法进行了改进 ,通过巧妙的作图 ,结合几何和物理两方面的关系导出了库仑主动土压力公式的另外一种表达形式 ,并由此得出了一种新的土压力图解法。和原库尔曼图解法相比 ,改进的方法计算量大大减少 ,作图更加方便 ,所得结果更加精确。算例表明 。

黏性土求主动土压力的库尔曼法及应用

基于库仑理论的平面滑裂面假设,利用库尔曼图解法求无黏性土土压力原理,考虑滑裂面上填土的黏聚力和填土与挡土墙背之间的黏着力,推出求黏性土主动土压力的新方法。方法可以使用假定滑裂面的方式进行编程试算从而求得主动土压力及破坏面倾角。采用VB.net为开发平台编制了程序。计算显示该方法易于实现且精度高,原理简单,便于推广应用。

改进的库尔曼图解法在折线坡土压力计算中的应用

为简化折线形土坡的库尔曼图解法,在王奎华直线形土坡简化方法的基础上,以挡土墙后二折线、三折线土坡为分析模型,以库伦土压力理论为基础,根据几何三角形与力矢三角形相似的关系对折线坡的库尔曼图解法进行了改进,提出了一种新的土压力图解法。和原库尔曼图解法相比,改进后的方法无需计算滑动土体的自重和逐一按比例尺量取线段表示滑动土体自重,计算量小,作图简便,所得结果更加精确。