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研究生:陳建桓
研究生(外文):Jean-Hwan Chen
論文名稱:由鋪面撓度值回算鋪面彈性模數的理論研究
論文名稱(外文):Theoretical Investigation on Backcalculation of Pavement Layer Moduli from Surface Deflection Data
指導教授:李英豪李英豪引用關係
指導教授(外文):Ying-Haur Lee
學位類別:碩士
校院名稱:淡江大學
系所名稱:土木工程研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1994
畢業學年度:82
語文別:中文
論文頁數:95
中文關鍵詞:彈性模數表面撓度值回算法無因次參數
外文關鍵詞:elastic modulisurface deflectionbackalcaulationdimensionless variable
相關次數:
  • 被引用被引用:2
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由於用以表示鋪面結構強度的鋪面各層彈性模數值,無法由非破壞性撓度
量測儀器所量測的表面撓度值直接計算得之。因此,一般是以回算的方式
,回算出鋪面各層材料的彈性模數。因為回算法的過程複雜且受到理論的
限制,本文針對其存在的一些問題做研究:(1)從量測之撓度值估算出彈性
模數值的解可能不唯一。(2)輸入資料範圍的選擇,沒有可依循之規範,
會影響回算的結果。(3)反覆運算的過程較耗費時間,甚至有時會有不收
斂的問題。本文是利用Scrivner導自Burmister二層系統撓度方程式的函
數關係式做為基礎,以無因次參數建立撓度的函數關係式,並確定其唯一
關係。其次,以此函數關係建立資料庫,利用圖形化的方式協助分析資料
,並可以作圖法回算彈性模數。之後利用投影追逐迴歸的分析方式,配合
線性模擬方法,建立方程式組。由此方程式組可以撓度值直接計算彈性模
數的近似值。最後以實例做初步的驗證,並對本研究提出應用的方向。對
於本研究尚未討論的部份,亦提出未來之研究建議。

Since the elastic moduli of pavement layers which represent the
strength of pavement structure cannot be obtained directly from
the surface deflection data measured from nondestructive
testing devices. Therefore, they are usually backcalculated
from some backcalculation procedures. Owing to the complicated
process and the theoretical limitations of backcalculation
procedures, this research study focuses on the following
problems: (1) The elastic moduli obtained from measured
surface deflection data may be not unique. (2) There exists
very few guidelines regarding to the selection of initial
trial values and input data ranges which may affect the results
of backcalculation dramatically. (3) The iterative
backcalculation procedures are often very time-consuming and
sometimes the specified convergence criteria are not satisfied.
This research first studies Scrivner's function which were
derived from Burmister's deflection equation of a two-layer
system. From this investigation, the related deflection
function was uniquely identified with dimensionless variables.
Secondly, a data base was constructed using this unique
relationship. This data base could also be graphically
represented by a series of monographs. Thus, the elastic
moduli of pavement layers can be easily obtained (or
"backcalculated") by graphical methods. Furthermore, this study
also strives to develop prediction equations to directly and
instantly calculate elastic moduli from surface deflection data
using the Projection Pursuit Regression and traditional linear
regression techniques. Finally, the preliminary results of this
thesis study were validated and illustrated through some
practical examples. Their tentative practical applications
were discussed and recommendations for future research were
also provided.

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