|Table of Contents|

Influence of geometric alignment of expressway superelevation transition section on hydroplaning speed of minibus(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2022年04期
Page:
140-147
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Influence of geometric alignment of expressway superelevation transition section on hydroplaning speed of minibus
Author(s):
JIA Xing-li1 CHEN Xing-peng1 HUANG Ping-ming1 MA Qing-wei2 LI Shuang-qing1 YAN Meng-hua13
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Xi'an Highway Research Institute Co., Ltd., Shaanxi Transportation Holding Group Co., Ltd., Xi'an 710065, Shaanxi, China; 3. College of Engineering, University of Wisconsin-Madison, Madison WI 53706, Wisconsin, USA)
Keywords:
road engineering expressway superelevation transition section hydroplaning speed fluid dynamics simulation range analysis water film thickness
PACS:
U412.3
DOI:
10.19818/j.cnki.1671-1637.2022.04.010
Abstract:
In order to reveal the change laws of hydroplaning speed of minibus under different geometrical alignment factors at expressway superelevation transition section, the relationships among hydroplaning speed, water film thickness and superelevation transition geometric alignment factors were analyzed according to the tire force characteristics of minibus during hydroplaning process. Based on the multivariate linear regression and fluid simulation, a quantitative model of hydroplaning speed of minibus at superelevation transition section was established. Combined the rainfall intensity, longitudinal slope and superelevation transition rate, the critical hydroplaning speed of minibus was calculated. Taking the superelevation transition section of a typical four-lane expressway as an example, the influence law of rainfall intensity, longitudinal slope and superelevation transition rate on the hydroplaning speed of minibus was studied, and the recommended limit speed value at superelevation transition section was given. Research results show that the maximum value of hydroplaning speed of minibus is 115.5 km·h-1 under the combination of longitudinal slope of 0.3%, superelevation transition rate of 1/200 and rainfall intensity of 20 mm·h-1, and the minimum value of hydroplaning speed of minibus is 99.3 km·h-1under the combination of longitudinal slope of 3.0%, superelevation transition rate of 1/330 and rainfall intensity of 80 mm·h-1. Under the condition that rainfall intensity and superelevation transition rate are certain, the hydroplaning speed decreases gradually with the increase of longitudinal slope, and decreases by 2.68% when the longitudinal slope increases from 0.3% to 3.0%. Under the condition that the rainfall intensity and longitudinal slope are certain, the hydroplaning speed increases gradually with the increase of superelevation transition rate, and increases by 2.25% when the superelevation transition rate increases from 1/330 to 1/200. Increasing the longitudinal slope can reduce hydroplaning speed. However, when the rainfall intensity increases to a certain degree, the influence of longitudinal slope and superelevation transition rate on the hydroplaning speed tends to be flat. When the rainfall intensity is 20-80 mm·h-1, the recommended limit speed is 95.0-115.0 km·h-1, but not greater than the design speed. 4 tabs, 7 figs, 31 refs.

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Last Update: 2022-09-01