道碴橫向阻力量測與預估模型建立

DEVELOPMENT OF PREDICTIVE MODEL FOR BALLAST LATERAL RESISTANCE

10.6652/JoCICHE.202106_33(4).0005

郭振銘(Chen-Ming Kuo)；林智強(Chih-Chiang Lin)；陳彥曦(Yen-Hsi Chen)；焦守正(Shou-Cheng Chiao)

道碴橫向阻力 ； STPT ； 道碴材料試驗 ； 迴歸分析 ； lateral resistance of ballast railway ； single tie push test ； material test for ballast ； regression analysis

中國土木水利工程學刊

33卷4期（2021 / 06 / 01）

295 - 305

繁體中文

鑒於近來軌道挫屈事故頻傳，本研究期望透過現地實驗與材料試驗，提出有效增加道碴橫向阻力之對策，以提升安全餘裕（safety margin）。本研究共選取113個點位，量測橫向阻力並記錄斷面，同時採集道碴進行材料試驗，而後採逐步迴歸方式進行分析。結果顯示，影響道碴橫向阻力值之因素，依影響程度由大至小排列為：卵石率、1.5吋篩殘留率、相對路肩堆高、0.5吋篩殘留率。經迴歸分析而得之道碴橫向阻力值預估式如下：預估值 = 367.28（卵石率）-8.58（卵石率）^2-1265.34（SQRT（卵石率））+ 4.53（相對路肩堆高）+ 10.85（1.5吋篩殘留百分率）+ 24.03（0.5吋篩殘留百分率）+ 1114.868。

There were several railway transportation accidents caused by railway buckling. It was known that promoting the ballast lateral resistance is a way to enlarge the safety margin of railway buckling. And this study intended to analyze how to approach the aim effectively. The purposes of the study are as follows: measure the lateral resistance of Taiwan Railway, figure out the relations between ballast material, ballast bed cross-section and lateral resistance, ascertain which parameters affect lateral resistance significantly, and develop a predictive model for lateral resistance. The study chooses 113 measuring points, using Single Tie Push Test (STPT) to measure lateral resistance. 50 kg ballast is collected for the following material tests which include sieve analysis, Los Angeles abrasion test, and water absorption test. Flakiness Index and cobble ratio are also checked. Then carry on regression analysis to realize which parameters affect lateral resistance greatly. The predictive model that comes from the result of regression analysis is shown below: Predictive Lateral Resistance = 367.276(cobble ratio)-8.578(cobble ratio)^2 -1265.34(SQRT(cobble ratio)) + 4.525(shoulder height) + 10.853(1.5＂ sieve analysis) + 24.03(0.5＂ sieve analysis) + 1114.868. According to the result of regression analysis, the most effective ways to improve lateral resistance of ballast railway are as below: ．Reduce the cobble ratio. The cobble ratio affects the maximum resistance value. ．Rise the shoulder height. The Increment of shoulder height is an effective method. ．Maximize the 1.5＂ and 0.5＂ grading materials in the standard. 1.5＂ and 0.5＂ grading materials significantly influence the lateral resistance.

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