冻融循环作用对土质边坡稳定性的影响

为研究冻融循环作用对土质边坡稳定性的影响,利用强度折减法,通过大型有限元软件ABAQUS计算获得边坡的稳定安全系数,与简化Bishop法获得的理论安全系数进行比较,并以特征部位位移发生突变作为破坏判据,研究了坡度和冻融循环次数对边坡稳定性的影响。结果表明:采用有限元中边坡整体失稳的三种判据得到的安全系数相差不大,且与简化Bishop法得到的理论解误差很小;当坡度一定时,边坡的安全系数随冻融循环次数增加逐渐降低,并最终趋于稳定;当冻融循环次数一定时,边坡安全系数随坡角的减小而增大,即边坡越平缓,安全系数越大,边坡稳定性越好,可为边坡稳定性影响因素的探究提供参考。

Effects of Freezing-Thawing Cycles on Stability of Soil Slope

In order to study the effects of freezing-thawing cycles on the stability of soil slopes, the strength reduction method was used to calculate the stability safety factor of the slope with the commercial finite element software ABAQUS, the result of which was compared with the theoretical safety factor obtained by the simplified Bishop method. Taking the sudden change of the displacement of the characteristic part as the damage criterion, the effects of slope angle and freezing-thawing cycles on slope stability were studied. The computational results of the slopes agree well with the analytical solutions. When the slope angle is fixed, the safety factor decreases and eventually stabilizes with the increasing number of thawing cycles. When the number of freezing-thawing cycles is fixed, the slope safety factor increases with the decrease of the slope angle, that is, the smoother the slope is, the greater the safety factor is, which accounts for the slope stability. The study can provide a reliable reference for the study of factors influencing slope stability.