土质边坡开挖试验及其数值模拟研究

摘要

Through indoor excavation test of soil slope, slope deformation and stress variation under the affects of load and ex-cavation were studied. The stress-strain mechanism leading to instability of the slope was discussed through numerical simula-tion. The effect of excavation on the stability coefficient of the slope was analyzed. The results show that the stability coefficient of the slope will reduce under load at slope top and excavation at stope toe. Under initial condition, the coefficient is 1. 84, and decreases to 1. 322 under the load of 120kg. After 15cm excavation, the coefficient decreases to 1. 093, and the slope is on the edge of instability. The stress variation of the slope is maximal in the part near the load and decreases away from the load area. Vertical stress gradually reduces as a result of excavation.%通过室内土质边坡开挖试验,研究了加载和开挖条件下边坡变形和应力变化规律,并通过数值模拟方法,探讨了边坡失稳的应力-应变机制,最后分析了开挖对坡体稳定系数的影响。结果表明：顶部载荷和坡底开挖均会降低边坡的稳定系数；初始条件下边坡的稳定系数为1.84,加载120 kg重物后减为1.332,开挖15 cm后减为1.093,坡体处于失稳边缘状态；坡体应力在靠近荷载处变化最大,越远变化越小,开挖主要造成坡体竖向受力逐渐减小。