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Deformation characteristics of unstable shallow slopes triggered by rainfall infiltration
Bulletin of Engineering Geology and the Environment ( IF 4.2 ) Pub Date : 2020-08-10 , DOI: 10.1007/s10064-020-01942-4
Kuo-Hsin Yang , Thanh Son Nguyen , Harianto Rahardjo , Der-Guey Lin

Identification of the influence of hydrological and geological factors on slope deformation characteristics (i.e., the displacement–time relationship) under rainfall plays a crucial role in providing early warning information and enabling the implementation of emergency remedial actions before a landslide occurs. In this study, a series of coupled hydro-mechanical finite element analyses were performed to investigate slope displacement behavior triggered by rainfall infiltration. First, the numerical model was validated by comparing the predicted displacement with those measured from a full-scale landslide flume test. A parametric study was then conducted, considering various hydrological conditions and soil hydraulic and mechanical parameters that were statistically determined from a large soil database compiled from relevant literature. Further, the influences of the aforementioned factors on the timing, magnitude, and rate of slope displacement prior to landslide occurrence were quantitatively evaluated in a sensitivity assessment. The numerical results indicated that the slope deformation characteristics could be significantly influenced by various hydrological and geological factors. Nevertheless, the slope displacement over time for all cases generally can be divided into three stages, namely the constant, accelerated, and critical deformation stages, which correspond to various states of slope movement and pore water pressure development. The relationships of slope displacement magnitude and displacement rate with the factor of safety were established, which provide a valuable information in practice for engineers to interpret the slope stability level from a large quantity monitoring data of slope displacement.



中文翻译:

降雨入渗引起的不稳定浅质边坡的变形特征

识别水文和地质因素对降雨条件下边坡变形特征(即位移与时间的关系)的影响在提供预警信息和在滑坡发生之前能够采取紧急补救措施方面起着至关重要的作用。在这项研究中,进行了一系列耦合的水力-机械有限元分析,以研究降雨入渗触发的边坡位移行为。首先,通过将预测的位移与通过全尺寸滑坡水槽试验测得的位移进行比较来验证数值模型。然后进行参数研究,考虑各种水文条件以及从相关文献汇编的大型土壤数据库中统计确定的土壤水力学参数。进一步,在敏感性评估中,定量评估了上述因素对滑坡发生之前的时机,幅度和边坡位移速率的影响。数值结果表明,边坡变形特征可能受到各种水文和地质因素的显着影响。但是,对于所有情况,随着时间的推移,坡度位移通常可以分为三个阶段,即恒定,加速和临界变形阶段,分别对应于坡度运动和孔隙水压力发展的各种状态。建立了边坡位移大小和位移率与安全系数的关系,

更新日期:2020-08-11
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