基於滲流侵蝕和無限邊坡法的滑坡臨界地下水位估算

南華大學機構典藏系統 > 科技學院 > 永續綠色科技碩士學位學程 > 博碩士論文 > Item 987654321/28410

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题名:	基於滲流侵蝕和無限邊坡法的滑坡臨界地下水位估算
其它题名:	Using the Seepage Erosion and Infinite Slope Method on the Critical Groundwater Level Estimation of Landslide
作者:	古杜 KUMAR, ATUL
貢獻者:	科技學院永續綠色科技碩士學位學程洪耀明 HONG, YAO-MING
关键词:	無限斜率;滲流;臨界地下水位;臨界流線長度;内聚力 Infinite slope;Seepage;Critical groundwater level;Critical streamline length;Cohesion
日期:	2020
上传时间:	2022-05-23 15:38:42 (UTC+8)
摘要:	地下水滲漏往往導致災難性的邊坡破壞。河岸，運河和水庫堤壩和山坡象徵著觀察到滲漏侵蝕的情況。在土壤侵蝕研究和與穀物顆粒運輸相關的研究中，細顆粒的分離和動員是重要的考慮因素。通過孔隙水流動引起的物理和化學效應可以分離細粘土顆粒。化學作用包括通過增加顆粒 - 顆粒排斥力將粘土顆粒粘合到砂粒上的粘合劑溶解和顆粒分散。本文描述了地下水位的上升將降低土壤濃度，增加相互平行的滲流侵蝕和滑坡的破壞。在本文中，使用理論研究探討臨界剪切應力(fie 值)和內聚力(C)之間的關係。該研究還考慮了地表附近風化和孔隙度對土壤摩擦角變化的影響。安全係數被概念化為深度的函數。在沙質和粉質土壤上進行邊坡穩定性分析。研究了土壤樣品特徵的深入研究，併計算了一些重要數據和信息，如從監測壓實實驗中獲得的最大干密度，使用篩分分析度分佈，使用常數求得的滲透率常數值(K 值)頭和落頭的方法。這些分析表明，對於沙質和粉質土壤的坡面，在穩定入滲條件下，地下水位以上都會發生破壞，這與經典無限斜率理論無法預測的一些野外觀測結果一致。　　This paper has tried to establish relationship between rainfall and groundwater level, and calculate the critical height of groundwater level that triggers landslide. Ground water seepage has often leads to catastrophic slope failure. River bank, canal and reservoir embankment and hill slope symbolizes situation where seepage erosion has been observed. The present paper describes the rising of groundwater level will reduce the soil concentration and raise the damage of seepage erosion and landslide which occur parallel to each other. In this paper, the relationship between critical shear stress (fie value) and cohesion (C) is explored using theoretical investigations. The study also considers the effect of weathering and porosity near the ground surface on changes in the friction angle of the soil. The factor of safety is conceptualized as a function of depth. Slope stability analysis is done on sandy and silty soil. A deep study on the characteristic of soil sample is studied along with calculating some important data and information like, the maximum dry density obtained from the proctor compaction experiment, particles size distribution classified using sieve analysis, permeability constant values (K values) found using constant head and falling head method. These analyses indicate that for hill-slopes of both sandy and silty soils, failure can occur above the water table under steady infiltration conditions, which is consistent with some field observations that cannot be predicted by the classical infinite slope theory.
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