Relationship of Rainfall Intensity with Slope Stability

Q3 Engineering Open Civil Engineering Journal Pub Date : 2023-04-15 DOI:10.28991/cej-sp2023-09-06

Mohammad Haziq Rosly, H. Mohamad, N. Bolong, N. Harith

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引用次数: 1

Abstract

The impact of rainfall on landslides is not an uncommon issue worldwide, including in Malaysia. It is a major challenge for geotechnical engineers to ensure the constructed slope is safe and can sustain longer periods of time, including during heavy rainfall. Kota Belud, Sabah, has been selected as the study area to meet the study objectives. Heavy rainfall has been recorded every year within Kota Belud, which has caused a repetition of landslide occurrences within the hilly areas, especially during the monsoon season. Presently, there is no local procedure for determining the rainfall intensity value for slope stability analysis. This study utilized the rainfall intensity value from Hydrology Procedure 26. Seepage analysis conducted shows rainwater infiltration has caused the groundwater level to increase from rainfall starts until 0.5 m below ground level and decrease after rainfall stops, creating fluctuations in the groundwater level during the wet and dry conditions within the wetting front. The factor of safety of the slope shows a decreasing trend, with a reduction of around 27 to 33% after 24 hours of rainfall in conjunction with the changes in groundwater level. However, the factor of safety increased by around 3% from the initial condition after 48 hours. The objective of this study is to identify the factor of safety of a rainfall-induced slope within Kota Belud utilizing the rainfall intensity design limits from Hydrology Procedure 26. Doi: 10.28991/CEJ-SP2023-09-06 Full Text: PDF

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降雨强度与边坡稳定性的关系

降雨对山体滑坡的影响在世界范围内并不罕见，包括在马来西亚。对于岩土工程师来说，确保建造的边坡安全，并能维持更长的时间，包括在强降雨期间，是一项重大挑战。为了达到研究目标，沙巴州的Kota Belud被选为研究区域。哥打别鲁德每年都有强降雨记录，这在丘陵地区造成了山体滑坡的反复发生，特别是在季风季节。目前，国内尚无确定边坡稳定性分析中降雨强度值的程序。本研究利用水文学程序26中的降雨强度值。渗流分析表明，雨水入渗使地下水位在降雨开始至0.5 m处呈上升趋势，在降雨停止后呈下降趋势，造成了湿润锋内干湿状态下地下水位的波动。边坡的安全系数随地下水位的变化呈下降趋势，降雨24 h后边坡的安全系数下降了27 ~ 33%左右。然而，48小时后的安全系数比初始条件提高了约3%。本研究的目的是利用水文学程序26中的降雨强度设计限制，确定哥打贝鲁德内降雨诱发斜坡的安全系数。Doi: 10.28991/CEJ-SP2023-09-06全文:PDF

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来源期刊

Open Civil Engineering Journal Engineering-Civil and Structural Engineering

CiteScore

1.90

自引率

0.00%

发文量

期刊介绍： The Open Civil Engineering Journal is an Open Access online journal which publishes research, reviews/mini-reviews, letter articles and guest edited single topic issues in all areas of civil engineering. The Open Civil Engineering Journal, a peer-reviewed journal, is an important and reliable source of current information on developments in civil engineering. The topics covered in the journal include (but not limited to) concrete structures, construction materials, structural mechanics, soil mechanics, foundation engineering, offshore geotechnics, water resources, hydraulics, horology, coastal engineering, river engineering, ocean modeling, fluid-solid-structure interactions, offshore engineering, marine structures, constructional management and other civil engineering relevant areas.