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Vol.52, No.2, PP.49-111
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1
Engineering Design and Parametric Studies on Drainage Well and Horizontal Drains in Subsurface Drainage System for Large Landslide Stabilization
52(2):49-71
Der-Guey Lin[1] Kuo-Ching Chang[1] Sheng-Hsien Wang[1] Wen-Tsung Liu[2]*
* Corresponding Author. E-mail : t40021@cc.kyu.edu.tw
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Engineering Design and Parametric Studies on Drainage Well and Horizontal Drains in Subsurface Drainage System for Large Landslide Stabilization
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Der-Guey Lin[1] Kuo-Ching Chang[1] Sheng-Hsien Wang[1] Wen-Tsung Liu[2]*

Abstract
Through the numerical modeling of large-scale landslides, a drainage well with horizontal drains was configured with a different elevation, length, spacing and location, and steady/transient seepage analyses were performed to determine the effects on drainage efficiency and slope stability. The parametric studies indicated that the
lower is the installation elevation of horizontal drains or drainage well, the more efficient is the drainage and the more stable is the slope. The drain length, Ld, must be sufficient to pass through the potential sliding surface, PSS, to obtain economical and effective subsurface drainage and slope stabilization. Under identical conditions, the effect of the drain length, Ld, on the maximum groundwater drawdown, hwmax, is much greater than that of the drain spacing, S. Consequently,to improve the groundwater drawdown and drainage efficiency, it is more economical and effective to increase the drain length than to decrease the drain spacing (or increase the number of horizontal drains). Generally, the hwmax and discharge rate, Q, of subsurface drainage is similar in parallel and fan-array drains.
Key Words: drainage well, horizontal drain, subsurface drainage, groundwater drawdown, factor of safety.
〔1〕Department of Soil and Water Conservation, National Chung Hsing University, Taichung 402, Taiwan, R.O.C.
〔2〕Department of Civil Engineering, Kao Yuan University, Kaohsiung, Taiwan, R.O.C.
* Corresponding Author. E-mail : t40021@cc.kyu.edu.tw
Received: 2020/07/06
Revised: 2020/08/31
Accepted: 2021/02/20
2
Modelling the Performance and Stabilization Effect of Subsurface Drainage using Drainage Well for Large Landslide
52(2):73-88
Der-geuy Lin [1] * Kuo-Ching Chang [1] Sheng-Hsien Wang [1] Jung-Chun Chen [2]
* Corresponding Author. E-mail : dglin@dragon.nchu.edu.tw
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3
Evaluating Runoff Variation in the Zhuoshui Alluvial Fan Through the Decomposition of the Budyko Curve and Use of Climate Elasticity Methods
52(2):89-99
Hsin-Yu Chen Hsin-Fu Yeh*
* Corresponding Author. E-mail : hfyeh@mail.ncku.edu.tw
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4
UAV-Assisted Investigation of Vulnerable Sediment Areas at an Irrigation Water Inlet and Potential Disaster Analysis
52(2):100-111
Wen-Hao Leu[1] Chien-Yuan Chen[2]* You-Ru Lu[2]
* Corresponding Author. E-mail : chienyuc@mail.ncyu.edu.tw
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5
Continuous Rainfall-Runoff Modeling Using HMS-SMA with Emphasis on the Different Calibration Scale
52(2):112-119
Ebrahim Yousefi Mobarhan [1]* Ebrahim Karimi Sangchini [2]
* Corresponding Author. E-mail : E.karimi64@gmail.com
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