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在经验性降雨阈值和边坡稳定性数值分析两大类研究的基础上,考虑了降雨入渗和非饱和土性质,使用岩土有限元软件Plaxis高级模式对滑坡预警降雨阈值进行研究分析。算例表明,将降雨量在降雨时间范围内分成2段后,得到的边坡稳定性变化与实际情况更接近,重新定义前期降雨为在给定初始条件下引起边坡最危险滑裂面到坡面之间土体吸力分布发生变化的降雨。前期降雨时长与潜在滑裂面最大深度成正比,与饱和渗透系数成反比。将前期降雨量引入到降雨强度—持时曲线中作为第三个空间坐标轴,将该曲线拓展为前期降雨量-降雨强度-持时曲面。通过一基岩型边坡算例展示了阈值曲面的建立方法,并通过与模型试验数据的对比验证了其可靠性。
Based on the two major types of empirical rainfall threshold and numerical analysis of slope stability, the rainfall infiltration and unsaturated soil properties are taken into account. The landslide warning rainfall thresholds are analyzed and studied by using Plaxis advanced model of geotechnical finite element software. The results show that the change of the slope stability obtained after the rainfall is divided into two sections in the rainfall time is closer to the actual situation. The redefinition of the pre-stage rainfall is the most dangerous slip surface of the slope under a given initial condition Changes in soil suction distribution between the slope surface rainfall. Pre-rainfall duration is proportional to the maximum depth of potential slip plane and inversely proportional to saturation permeability coefficient. The earlier rainfall was introduced into the rainfall intensity-time curve as the third spatial coordinate axis, and the curve was extended to the previous rainfall-rainfall intensity-persistent surface. An example of bedrock slope is presented to illustrate the method of establishing the threshold surface. The reliability of the method is verified by comparison with the model test data.