Effects of joint spacing and dynamic friction angle on the travel distance of rock debris

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  • 亀裂間隔と動摩擦角が崩壊岩塊の到達距離に及ぼす影響に関する研究
  • 亀裂間隔と動摩擦角が崩壊岩塊の到達距離に及ぼす影響に関する研究 : 道路沿いの亀裂性岩盤斜面を対象とした数値解析
  • キレツ カンカク ト ドウ マサツカク ガ ホウカイ ガンカイ ノ トウタツ キョリ ニ オヨボス エイキョウ ニ カンスル ケンキュウ : ドウロ ゾイ ノ キレツセイ ガンバン シャメン オ タイショウ ト シタ スウチ カイセキ
  • －Numerical analysis of jointed rock slope failure along roads－
  • ―道路沿いの亀裂性岩盤斜面を対象とした数値解析―

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Abstract

<p>  While travel distance (L) of landslides has been studied for decades, researchers have continued updating the statistical data and the methods to estimate L. The statistical data of different countries commonly show that relationships exist between L, volumes of debris (V), and/or fall heights (H) from the crest of the landslides. However, there are not many publications that examined the potential differences in L, depending on whether the slope consists of jointed rock or fine soil. This research concerns the rock slope failures that spreads rock debris on flat area such as roads. Particularly, the effects of joint spacing (JS) and the dynamic friction angle (α) on L were assessed by 2-dimensional distinct element code (UDEC v.6.00). The simulated relationship between H and L agreed with those of the actual failure records and the effect of α and on L was consistent with the past findings. Although it was not possible to reduce JS below certain size due to computational time limit, results of the simulations suggest that JS is an influential factor such that L tends to decrease as JS increases.</p>

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