Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33333
標題: Investigations of Landslide Occurrence Mechanisms with Groundwater Logging Meuhod
以地下水檢層法探討崩塌發生機制
作者: Wu, Jiann-Hsing
吳建興
關鍵字: groundwates logging;地下水檢層;landslide;崩塌地
出版社: 水土保持學系
摘要: 
By theoretical analyses, laboratory and field tests, an
applicable analytical model of groundwater logging is
developed and applied for investigating landslide
mechanism.The conclusions are: A. Flowing
layer determination with groundwater logging:
a. The maximum change of specific resistivity at flowing layer
occurred during the period from time t = 0 to t = 5
min.. The logging curve contracted beneath the
flowing layer. This is the most important
characteristics of decision of flowing layer with groundwater
logging. b. Owing to the dispersion of brine water in the
boreholes, the maximum change rate of specific
resistivity at flowing layer occurred during the period
time t = 0 to t = 5 min. After 5 min., the rate decreased and
remained at constant range till the end observation. Above the
flowing layer, the logging curves were parallel to each
other. Sometimes the final specific resistivities of
upper part are larger than that of flowing layer.
c. The results of logging test by SAKATA''s instrument indicate
that the flowing layer may be detected exactly after
replacing the specific resistivity ρwith the value
of (ρn-ρbase)/( ρbackground-ρ0). B. Groundwater
discharge prediction with groundwater logging:
With the observed value at t = 20 min. as the base, the
prediction formulaof discharge Q is shown as:
Q=597.50(△ρ/△t)+0.474 (ml/sec)
C. Occurrence mechanism of Chau-lin landslide:
a. The upper area near the cliff of Ku-Lom-San:
The landslide is induced by releasing pressure at the inside of
the rock. b. The area around Duan-Hwun-Ku
The classification of landslide of this area is plate type. It
is induced by(1).stream erosion;(2).slope surface erosion;(3).
earthquake;(4).groundwater;(5).geologic condition.

本論文係針對地下水予於進行有關檢層相關之研究。藉由理論推演、
室內試驗與野外試驗,以提供可茲應用之檢層分析模式。並據以探討崩塌
發生機制。茲將研究結果彙整如下:
一、地下水檢層室內試驗結果有四點特性可應用於流動層之判定:
1. 流動層之比電阻值變化以t = 0 min.至t = 5 min.間為最大,若無情
況原因( 如 漏水等),檢層曲線於流動層下方即成收斂。
2. 流動層與其緊鄰上方層之特定範圍內(約為3至5層檢定層厚)所檢出之
曲線呈類似 層狀流之平行線,各層之比電阻值的變化相近;再往
上層則比電阻值之變化明顯 地減少。
3. 流動層愈接近水位面時,其上層流動層及其上方各層之比電阻值之變
化量就愈大 。且亦有流動層上方之最終比電阻值(t = 180 min.
時)大於流動層之值。 4. 經由抽水而產生之垂直流作用,其
檢出效果比同流量範圍之單層檢層試驗或垂直 流檢層試驗之結果
為顯著。且其檢層曲線能充分地顯示垂直流之特性。因此抽水 檢
層法值得應用於地下水之檢層。
二、在檢層試驗中孔內食鹽水濃度變化係受地下水稀釋作用與上層食鹽水
向下運動及溶 液內流散作用之共同影響。
三、應用SAKATA檢層儀器進行檢層時,應以各層加入食鹽水前後比電阻值
之變化量為校 正基準,而以無因次之比例值(即)替代觀測值。其校
正後之檢層圖對於流動層可予 於較明確之檢出。
四、由試驗結果推得流量Q推估式為
Q=597.50(△ρ/△t)+0.474 (ml/sec)
其可應用於地下水排水工程規劃設計之參考。
五、草嶺崩塌地之發生機制
(一)、最上方地區
本地區之主要崩塌機制乃係為崩崖邊緣因岩層解壓所造成之岩塊崩落。因
此在近期內較可能發生或應特別注意者為於地震發生後所造成之岩層內局
部之破壞,或是豪雨後大量雨水入滲聚積於岩層內部而產生間隙水壓所誘
發之岩塊崩落。由於岩層內部有多處破碎帶,所以很難推測其將發生崩壞
之破壞面。 (二)、斷魂
谷上方與下方地區
本區之崩塌型態係為平面型地滑。其發生之主要誘因為:
1.清水溪之切割坡腳:
2.坡面蝕溝之縱向侵蝕
3.地震力作用
4.地下水作用
5.地質條件影響
如今清水溪與坡面之蝕溝侵蝕作用已達相當之程度,而且豪雨對坡面穩定
有明顯之影響。因此本區即使小規模之地滑亦將誘發大規模之地滑。
URI: http://hdl.handle.net/11455/33333
Appears in Collections:水土保持學系

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