A new method for the determination of the critical slip surfaces of slopes is proposed in this paper. In this paper, the original critical slip field method is extended in terms of the total residual moment, values of residual work as well as the unbalanced thrust force at the exit point for a given non-circular slip surface. The most critical slip surface with the maximum representative value for a prescribed factor of safety will be optimized and located using the harmony search algorithm. The prescribed factor of safety is modified with certain tiny interval in order to find the critical slip surface where the maximum representative value is zero. The aforementioned approach to the location of the critical slip surface is greatly different from the traditional limit equilibrium procedure. Three typical soil slopes are evaluated by use of the proposed method, and the comparisons with the classical approaches have illustrated the applicability of the proposed method.
为解决膨胀土在建筑工程领域带来的危害,制作15,20,25 mm 3个高度邯郸膨胀土试样,研究了试样高度对膨胀特性的影响。利用控制变量的方法对不同尺寸的邯郸重塑膨胀土试样进行膨胀力和膨胀率试验。结果表明:试验高度范围内,在K0应力状态下,随着试样高度增加,膨胀力呈线性增加,试样高度每增加1 mm,膨胀力增大1.92 k Pa,膨胀土试样浸水过程产生的膨胀力不存在尺寸效应;随着试样高度增加,膨胀率的增长速度随之加快,膨胀率随着试样高度增加而增大,试样高度每增长1 mm,膨胀率约提高1.06%,膨胀率存在明显的尺寸效应。该研究结论可为区域性膨胀土区建筑工程的安全性和稳定性提供参考依据。
