ENGINEERING PROPERTIES OF DEBRIS FLOW MATERIAL AT BUNDU TUHAN, RANAU, SABAH, MALAYSIA

E. J. Joe, F. Tongkul, R. Roslee
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引用次数: 3

Abstract

Recurring events of debris flow especially during heavy rainfall have caused cut-off at one of the main road in Bundu Tuhan, Ranau namely Jalan Tamparuli-Ranau KM 83.90. In several incidents, the road was closed to public for hours due to deposition of thick sediment on the road, causing interruption to their daily activities. However, study on the properties of the debris flow material and their relationship with debris flow characteristics is quite limited. Thus, the objective of this study is to comprehend the debris flow trait based on the material property. The study of the material property pertains to the grain size distribution, Atterberg limit, and lastly the moisture content. They are interpreted based on the results in site investigation report where the soil samples were taken from nine numbers of trial pits which were excavated around the runout and deposition zones. This study found that the granular type debris flow displays high kinetic energy, shorter transportation distance towards deposition, large velocity, and more sediment flow towards deposition. Meanwhile, the low plasticity index of the soil causes a high occurrence of liquefaction process. Higher moisture content has also assisted in the mobilization of material.
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马来西亚沙巴拉瑙邦都土汉泥石流材料的工程特性
反复发生的泥石流事件,特别是在暴雨期间,导致拉瑙邦杜图汉的一条主要道路被切断,即Jalan Tamparuli-Ranau KM 83.90。在几次事故中,由于道路上沉积了厚厚的沉积物,道路被关闭了几个小时,导致他们的日常活动中断。然而,对于泥石流材料的性质及其与泥石流特性之间的关系的研究非常有限。因此,本研究的目的是基于材料性质来理解泥石流的特征。对材料性能的研究主要涉及晶粒尺寸分布、阿特伯格极限和含水率。这是根据现场调查报告的结果进行解释的,现场调查报告是从跳动带和沉积带周围挖掘的9个试验坑中提取的土壤样本。研究发现,颗粒型泥石流具有动能大、向沉积移动距离短、流速大、泥沙流向沉积较多等特点。同时,土壤的塑性指数较低,导致液化过程的发生率较高。较高的水分含量也有助于材料的动员。
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