石門水庫淤泥-砂土壓密性質之實驗研究

An Experimental Study on Consolidation Properties of SHI-MEN Mud-Sand

魏子翔(Hsiang-Tzu Wei)

指導教授 ： 馮道偉

中原大學/工學院/土木工程研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500328

摘要

近年來，台灣經濟的增長，使得土地的利用已經到達了飽和狀態，以致於在沿海地區，進行填海造陸的工程。另一方面，目前台灣各水庫上游集水區水土保持不佳，表土長年經雨水沖刷，而致使大量的淤泥沉積於水庫中，為了解石門水庫淤泥用於填海造陸的可行性，本研究以石門淤泥、麥寮砂及渥太華砂土樣進行基本物理性質試驗及SEM試驗，再以不同配比之石門淤泥-砂土，分別於蒸餾水及海水中，進行單向度壓密試驗，來研究複合土壤之壓密性質及淤泥再利用的方式。
試驗結果顯示：(1) 當淤泥含量 30%時，複合土壤之壓密曲線皆已經呈現標準的倒S型；(2) 複合土壤之孔隙比隨淤泥含量增加而增加；(3) 複合土壤之 、 皆隨著壓密應力之增加而增大， 隨著淤泥含量之增加而增加，其中，石門淤泥-麥寮砂試樣之壓縮性高於石門淤泥-渥太華砂試樣；(4)複合土壤之壓密係數 皆隨著壓密應力之增加而增加，隨著淤泥含量之增加而降低，於海水中較於蒸餾水中有增加的趨勢；(5)複合土壤之滲透係數 隨孔隙比 減少而降低，隨淤泥含量的增加而降低；(6) 複合土壤的壓密特性，當淤泥含量 20%時，與砂土相近，當淤泥含量 40%時，與黏土相近；(7) 基礎型式為連續基腳（鋼筋混凝土）時，麥寮砂最多可添加17%的石門淤泥，渥太華砂最多可添加22%的石門淤泥。基礎型式為筏式基礎（鋼筋混凝土）時，麥寮砂最多可添加26%的石門淤泥，渥太華砂最多可添加31%的石門淤泥。

關鍵字

壓密

並列摘要

Abstract

In recent years, the growing of economics in Taiwan causes saturated states of the land so that in the coast,the construction of reclamation has
been done.On the other hand,Soil and water conservation wasn’t good in the upper watershed of reservoirs in Taiwan,and surface soils were scour
-ed for a long time resulting in silting problem in the reservoirs.In order
to solving the possibility of reclamation by using SHI-MEN Reservoir
mud. In this study,the consolidation properties of composite soils and the reclamation ways of mud content are investigated by using SHI-MEN Reservoir mud, Mai-Liao sands,and Ottawa sands samples. Firstly, the basic physi - properties test ,and SEM test were conducted on the samples
Secondly, the different proportion of SHI - MEN mud - sand were made in distilled water and seawater in one - dimensional consolidation test.
The results of this study show (1) When mud content 30%,all the consolidation curves exhibit the typical S-shape ; (2) the void ratio of composite soils increases with the increasing mud comtent ; (3) the compression index(cc),secondary compression index(cα) of composite soils increases with the increasing consolidation pressure, cc/cα increases with the increasing mud content,the compressibility of SHI-MEN mud-Mai-Liao sand samples are higher than SHI-MEN mud-Ottawa sand
samples; (4) the cosolidation coefficient(cv) of composite soils increases with the icreasing consolidation pressure,decreases with the increasing mud content,in seawater is faster than in distilled water; (5) the permeability coefficient(kv) of composite soils decreases with the
decreasing void ratio(e50) and the increasing mud content ; (6) when mud content 20%,the consolidation properties of composite soils is similar to sand,when mud content 40%,it is similar to clay; (7)when the foundation is continuous footing(R.C.),Mai-Liao sands can be added 17% SHI-MEN
mud at most, Ottawa sands can be added 22% SHI-MEN mud at most.
; when the foundation is mat foundation(R.C.),Mai-Liao sands can be added 26% SHI-MEN mud at most, Ottawa sands can be added 31% SHI-MEN mud at most.

並列關鍵字

SHI-MEN ； sand ； reclamation ； cosolidation

參考文獻

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Consolidation History on Critical State of Sand," Journal of Geotechnical and Geoenvironmental Engineering,ASCE,Vol.129,