基于Bishop法的露天矿边坡稳定分析与实现

为了提高Bishop法在露天矿边坡稳定分析中的准确性,根据圆弧滑动的数值解研究,提出了一种更为合理的最危险圆弧滑面搜索方法,并从理论上作了分析和论证.修正了在半径长度按设定步长递增时,圆心坐标的移动形式,推导了半径的准确变化范围以及拉裂距离变化范围,并确定了其与帮坡高度、帮坡角的变化关系.确定滑块内黏聚力、内摩擦角、重度时考虑了层状结构岩层的影响,更趋近于实际情况.提出了露天矿边坡圆弧滑动稳定系数及最终帮坡角的确定在计算机程序中的实现过程,包括危险滑面的搜索、层状边坡的特殊处理等,并介绍了算法流程.编写了简化Bishop法计算露天矿边坡稳定系数及最终帮坡角的VB语言程序.检验结果既能得出符合露天矿边坡设计要求的帮坡角及其稳定系数,还能查看不同帮坡角对应的稳定系数.

Analysis and Implementation of Surface Mine Slope Stability Based on Bishop Method

The accuracy of the slope stability analysis in surface mine by Bishop method was improved.Based on the study of the numerical solution for circular sliding,a method of searching for the most dangerous sliding surface is given,which is analyzed and proved more reasonable in theory.And the moving trace of circle center as the length of radius progressive increases in presupposed step length is modified.At the same time the accurate variation range of radius and the distance of fissure is derived,which also shows the relationship between the slope angle and height.When the cohesion,the internal friction angle and the density of various rock layers are confirmed the influence of the layer structure is considered,which is more practical.We put forward the program implementation of calculating the stability coefficient of circular arc sliding and the finale slope angle in surface mine slope,including the situations of searching for the most dangerous sliding surface and the slope of layer structure,and the program algorithm flow is introduced.We designed the VB program of calculating the stability coefficient and the finale slope angle in surface mine slope,of which the result is acceptable,and we can check the stability coefficient in different slope angles.