|Table of Contents|

Radius and widen value of circle curve of highway pioneer road(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年3期
Page:
43-53
Research Field:
道路工程
Publishing date:

Info

Title:
Radius and widen value of circle curve of highway pioneer road
Author(s):
YANG Yong-hong1; 2;  ZHU Guan-ru1;  WANG Chun1;  ZHENG Tao1; 3;  ZHANG Yu1
(1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640,Guangdong, China; 2. Key Laboratory of Highway Engineering of the Ministry of Education, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 3. Guangdong Provincial Key Laboratory of Tunnel Safety and Emergency Support Technology and Equipment,Guangzhou 510545, Guangdong, China)
Keywords:
road engineering;  construction pioneer road;  circle curve radius;  widen value;  passing ability;  steering stability
PACS:
U412.33
DOI:
10.19721/j.cnki.1671-8879.2024.03.004
Abstract:
In order to supplement the design indicators for pioneer road alignment, improve thequality of pioneer road construction and ensure transportation safety, starting from the characteristics of pioneer road transport vehicle, radius and widen value as two key parameters were studied. Firstly, four representative vehicles were selected, excavators,dump trucks, semi-trailer trains, and beam carriers by investigating the construction situation ofpioneer roads in 9 expressway and 1 provincial road projects in China. Subsequently, the spacepassing ability of vehicles was calculated based on the relationship between the vehicle structureand the road geometry, and the required widening values and radius passing ability limits fordump trucks, semi-trailers, and beam carriers were obtained, a lateral stabilityverification method was proposed based on the backward shift of vehicle gravity center for dumptrucks and semi-trailer trains. Finally, a comparison was made between the radius values ofcircular curves under the different superelevation of lateral stability constraints for two types ofpioneer roads with different lateral friction coefficients(0.3 and 0.8), and the radius values werecalculated using the pavement friction coefficient. Key indicators for horizontal curves corresponding to representative vehicle models were recommend and can be used as a reference for pioneer road design. The results show that the radius passing ability limits for dump trucks and semi-trailer trains are 12 m, 48 m for monolithic beam carriers, and 14.5 m for towed type beam carriers. There is a significant difference in the required pioneer road radius and widen values for specific vehicle types. The main factors affecting vehicle lateral stability are speed, center of gravity position, and pavement friction coefficient. In the condition of a lateral friction coefficient of 0.3, vehicles are more prone to lateral sideslip, while in the condition of a lateral friction coefficient of 0.8, vehicles are more likely to lateral rollover. The minimum radius value can be significantly reduced by increasing the superelevation, with little impact on lateral stability. The turning radius of dump trucks and semi-trailer trains calculated by lateral force coefficients both meet the requirements for lateral stability.9 tabs, 10 figs, 26 refs.

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Last Update: 2024-05-01