边坡稳定性分析条分法条间力合理性研究

论证表明，下列4项可作为条间力合理的条件：①土条分界面上的抗剪稳定系数大于边坡稳定系数；②条间有效法向力大于0；③滑面为折线形时，条间切向力不恒等于0，当土条底面倾角沿滑动方向逐渐减小时，各条间切向力大于0；反之小于0；④端部土条外侧有水压力时，端部条间力合力与条间法向力的夹角随土条分界面到土条外侧的距离趋近于0而趋近于0。检查结果显示，詹布法、沙尔玛法①及专用于圆弧形滑面的瑞典法条间力合理性较低；专用于圆弧形滑面的简化毕肖普法条间力合理性较高；简化詹布法、美国陆军工程师团法、罗厄-卡拉菲尔斯法和传递系数法的条间力合理范围较窄；方玉树法、沙尔玛法②及③、斯宾塞法、摩根斯坦-普赖斯法和科里亚法条间力合理范围较宽，其中沙尔玛法③、摩根斯坦-普赖斯法和科里亚法条间力合理范围又宽于沙尔玛法②和斯宾塞法，以方玉树法条间力合理范围最宽。

Rationality of inter-slice forces of slices method for slope stability analysis

Argumentation indicates that the following items can be the criterions of rational inter-slice forces： ①shear safety coefficients of slice interfaces are bigger than that of the slope; ② effective normal inter-slice forces are bigger than zero; （3） for the broken-line slip surface, tangent inter-slice forces are not identical to zero ; when obliquity of the slice undersides gradually decreases along slip direction, each of the forces is bigger than zero; conversely when obliquity of the slice undersides gradually increases along slip direction, each of the forces is less than zero ; ④ when there is water pressure on outsides of end slices, angle of inter-slice force and normal inter-slice force will tend to zero as distance between slice interface and outside of end slice tends to zero. Examination result displays that rationality of inter-slice forces of Janbu Method, Sarma Method 1 and Sweden Method is lower; rationality of Simplified Bishop Method is higher; the rational extension of inter-slice forces of Simplified Janbu Method, Method of Engineering Division of Americal Land Forces, LoweKalafiath Method and Transmitting Coefficient Method is more narrow; the rational extension of Fang Yushu Method, Sarma Method 2, Sarma Method 3, Spencer Method, Morgenstern-Price Method and Correia Method is wider, thereinto, Sarma Method 3, Morgenstern-Price Method and Correia Method＇ s rational extension is wider than Sarma Method 2 and Spencer Method＇s, the rational extonsion of Fang Yushu Method is the widest one.