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題名:梳子壩在土石流作用下之三維數值分析     (26點)
Three Dimensional Numerical Analyses of Slit Dam Subjected to Debris Flow
著者:林德貴(Der-Guey Lin) ;黃伯舜(Bor-Shun Huang) ;黃隆明(Long-Ming Huang)
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:梳子壩 ; 三維有限元素 ; 三維數值模型 ; 撞擊力 ; 壩柱寬度與壩柱開口寬度比 ; slit dam ; 3-D finite element ; 3-D numerical model ; impact force ; ratio of the width of slit column to the open size of slits
刊名:中華水土保持學報
卷期:41卷1期(2010.3)
頁碼:27-39
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

本研究以台中縣和平鄉博愛村境內松鶴一溪第5 號梳子壩為分析案例, 在相同壩柱 高度條件下且尺寸配置符合水土保持規範之要求原則下,選用四組不同壩柱寬度(D)與壩柱間開 口寬度(均比之配置變化( D/ L=0 . 667-0.683 ) 之梳子壩, 以三維( 3-D ) 有限元素數值程式, 建立三維數值模型, 並對4 種外力組合作用狀況下, 即Cαse l( 壩體上游堆積土石由淨空(空 壩)到土石流推擊)、Cαse 2 (淤滿後靜土石堆積狀態加最大地震力) 、Cαse 3 (壩體上游 土石流淤滿後士石流溢流)及Cαse 4 (壩體上游土石流接近淤滿時巨碟撞擊)進行靜態、3-D 力學分析, 並針對壩柱D/L 比值及對壩體應力與變位分布之影響進行探討。分析結果顯示, 在 最大彎曲拉應力+σyy ( >0 ) 與混凝土容許拉應力σt 之比值( +σyy /σt ) 方面: Cαse 4 ( 80.02% ) >Cαse 1 ( 17.94% ) >Cαse3 ( 5.78% ) >Cαse2 月.12% ) 。而在最大彎曲壓應力σyy ( <0 ) 與混凝土容許壓應力σc 之比值( 一σyy/σc) 方面: Cαse 4 月.4 6% ) >Cαse 1 ( 2.86% ) >Case 3 ( 1.95% ) >Cαse 2 ( 1.51 % ) 。同時, 最大剪應力σyz 與混凝土容訐剪應力σs 之比值( σ'yz /σs) 方面: Cαse 4 ( 7 1. 11 % ) > Cαse 1 ( 6.93% ) >Cαse3 ( 2.76% ) >Cαse 2 ( 0 . 93% ) 。最 後,依據數值分析結果, 壩柱在最大拉應力方面,當士石流巨碟撞擊力由三支壩柱減為三支壩 柱來分擔時, 其最大拉應力+σyy 與混凝土容許拉應力σt 之比值( +σyy /σt ) , 將由0 . 53 提昇 為0 . 80 (約增加51 % ) 0 同時, 最大剪應力σyz 與混凝土容許剪應力σs 之比值( σyz /σs) 則由0 .4 8 提昇為0 . 71 (約增加48 % ) 。由上述分析值可知, 巨碟撞擊力之承擔方式由三支 壩柱i成為三支壩柱後,將使混凝土壩體結構之拉應力及剪應力更接近其容許強度值。因此,在 進行壩體應力檢算時,士石流巨碟撞擊力可考慮、假設由相鄰之三支壩柱來承擔, 以獲得較有效 經濟之材料強度應用。
This study selects the No. 5 slit dam (gravity dam) situated at the Song-He No. 1 creek, Bo-Ai village, He-Ping, Taichung Coun句T as a case history for structural analysis. By keeping the dam height (or slit column height) unchanged, the configuration meets the design criteria. The four sets of fictitious slit dam were analyzed under different slit column widthjslit open size ratios or (Dj L) ratio (Dj L =0.667-0.683). Where, D and L represent the width of the silt column and the open size of the silt, respectively. Three dimensional (3-D) static structural analyses were performed on a slit dam under various loading conditions, namely Cαse 1-Cαse 4, in which, Cαse 1 (Condition 1: debris accumulates at the upstream of the slit dam, and Loading 1: driven force from none to a value induced from the action of debris flow) , Cαse 2 (Condition 2 : slit dam is filled up by debris, and Loading 2: the maximum earthquake loading is applied) , Cαse 3 (Condition 3: slit dam is filled up by debris at the upstream, and Loading 3: debris flow overflows) , Cαse 4 (Condition 4: slit dam is nearly occupied by debris flow at the upstream point, and Loading 4: the impact force induced from the large boulder is applied). Meanwhile, through the analyses, the effect of (Dj L) ratio, stress and displacement distribution of the dam body are also examined. The numerical results indicate the ratios of the maximum bending tensile stress +σyy (>0), maximum bending compressive stress σyy (<0) 缸ld maximum shear stress σyz of slit column to their allowable values of concrete ,間, σc and (}s are: For (+σyy j σt): Cαse 1 (17 . 94%) > Cαse 3 (5.78%)>Cαse 2 (0.12%). For (一σyy jσc) : Cαs e 1(2.86%)>Cαse 3( 1. 95%)>Cαse 2( 1.51 %). For (σyz jσs): Cαse 1(6.93%) >Cαse 3(2.76%)>Cαse 2(0.93%). Finally, according to the numerical results, the ratio of the maximum tensile stress to the allowable tensile stress of concrete (+σyy j叫 and the ratio of the maximum shear stress to the allowable shear stress of concrete (σ.yz j σs) in slit column are increased from 0.53 to 0.80 (about 51% increment) and from 0 .48 to 0 .71 (48% increment), respective1y, if the impact force is carried by two slit columns instead ofthree. These imply the tensile stress and shear stress induced from impact force will be much closer to their allowable values if the force is distributed to two slit columns rather than three. As a consequence, to achieve a beneficial and efficient utilization of material strength in stress analyses of slit dam for debris flow impact force, it is suggested to assume that the impact loading is simply taken by two slit columns.


    

本卷期目次
中華水土保持學報 41卷1期 (2010.3)
比較紋理特徵及多時段光譜特徵對分類正確率之改善/ 江介倫張世駿蘇元風鄭克聲范正成
應用ERT法於崩塌地特性調查與水分變化之研究/ 馮正一陳奕凱鄭旭涵
梳子壩在土石流作用下之三維數值分析/ 林德貴黃伯舜黃隆明
台灣地區年最大一日雨量區域頻率分析之研究:(I)理論部分/ 陳儒賢陳清田洪毓婷
均勻降雨時坡地之水流特性分析/ 楊佳錫謝平城
基因演算法自動演化類神經網路應用於山崩災害之評估/ 陳怡睿謝舜傑陳景文倪柏寧
漂流木運移特性對河川型態改變之試驗研究/ 陳樹群趙益群陳佳璜
集水區土砂整治率之修正及案例分析/ 連惠邦蔡易達段錦浩王晉倫
 
   
 
   

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