初始地下水位和降雨润湿对边坡稳定性的影响(以波诺罗戈县Pulung街道Banaran村Tangkil村滑坡为例)

D. Ariesta
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引用次数: 5

摘要

滑坡是地形、岩性、地质构造、地下水位等多种因素综合控制的自然现象。如果山体滑坡造成人员伤亡、直接损失和最初破坏的后续影响,如在波诺罗戈摄政的Banaran村发生的情况,则被视为自然灾害。本研究旨在探讨初始地下水位条件和降雨润湿对巴纳然村滑坡的影响。本研究是在假定初始地下水位条件的情况下进行的。土壤参数是通过在实验室测试土样得到的。入渗参数采用Philip-Dunne法通过渗透性试验获得,面雨量采用Thiessen多边形法计算。采用slope /W计算边坡稳定性模型,采用SEEP/W进行降雨润湿分析。利用这两种数值模型对Banaran村滑坡进行了分析,分别考虑了1)无降雨和2)有降雨和入渗两种情况。分析结果表明,在初始地下水位条件下,情景3发生滑坡的安全系数为1.008;在相似情景下,考虑降雨和入渗的安全系数为0.973。SEEP/W和SLOPE/W结果表明,地下水位初始条件对安全系数的降低影响较大,而润湿过程对安全系数的降低影响不明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Effect of Initial Groundwater Table and Rainfall Wetting Towards Slope Stability (Case Study of Landslide in Tangkil Hamlet, Banaran Village, Pulung Subdistrict, Ponorogo Regency)
Landslide is a natural phenomenon that can be controlled by a combination of various factors, such as topography, lithological condition, geological structure, water table, etc. Landslide is stated as a natural disaster if it causes casualties, direct losses and subsequent impacts of the initial destruction, as happened in Banaran Village, Ponorogo Regency. This study is aimed to examine the effects of initial groundwater table conditions and rainfall wetting on Banaran Village landslide. This study was conducted by assuming scenarios of initial groundwater table conditions. Soil parameters were obtained by testing soil samples in the laboratory. Infiltration parameters were acquired through permeability tests using the Philip-Dunne method, while areal rainfall was calculated using the Thiessen polygon method. In addition, slope stability modeling was calculated by using SLOPE/W while rainfall wetting analysis was carried out through SEEP/W. The analysis of Banaran Village landslide through these two numerical models was conducted by considering two conditions: 1) without rainfall and 2) with rainfall and infiltration. The analysis results imply that the landslide occurred in the initial groundwater table condition in scenario 3 with a safety factor of 1.008, and in a similar scenario with a safety factor of 0.973 when taking into account rainfall and infiltration. The results from SEEP/W and SLOPE/W indicate that the initial condition of the groundwater table highly influenced the decrease of the safety factor, while the wetting process did not cause a significant decrease of the safety factor.
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