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针对严格Janbu法不易收敛的缺点,采用Matlab曲线拟合工具箱里的三次样条函数csapi拟合条间力矩,简化了计算程序;采用改进的严格Janbu法等极限平衡方法和考虑地震动荷载时程分析的拟静力法对昆明绕城高速公路杨林隧道出口段某滑坡体的抗滑稳定性进行了系统地分析和研究,计算了该边坡在自然工况和地震工况条件下的抗滑稳定安全系数值。结果表明:在自然工况下边坡抗滑稳定安全系数在1.447～1.452之间,边坡是稳定的;在地震工况下,通过综合计算分析所得到的边坡抗滑稳定安全系数在0.55～1.017之间,边坡存在失稳风险。
In order to overcome the shortcomings of the Janbu method which is not easy to converge, the cubic spline function csapi in the Matlab curve fitting toolbox is used to fit the moments between the bars and the calculation procedure is simplified. The improved Janbu method such as the limit equilibrium method and the seismic dynamic load The pseudo-static method is used to systematically analyze and study the anti-sliding stability of a landslide at the exit section of Yanglin Tunnel in the Kunming expressway around the city. The calculated results show that under the conditions of natural conditions and seismic conditions Slip stability safety factor value. The results show that under natural conditions, the slope safety factor of slope stability is between 1.447 and 1.452, and the slope is stable. Under seismic conditions, the safety factor of slope stability against sliding in the condition of 0.55 ~ 1.017, there is a risk of slope instability.