|Table of Contents|

Reasonable length of transition section at expressway tunnel entrance and exit

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

Issue:
2012年03期
Page:
17-23
Research Field:
道路工程
Publishing date:

Info

Title:
Reasonable length of transition section at expressway tunnel entrance and exit
Author(s):
ZHANG Chi1;  YANG Shao-wei1;  YU Hui-jiang2;  REN Chun-ning1
1. Key Laboratory for Special Area Highway Engineering of the Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Yuexiu(China)Transport Infrastructure Investment Co Ltd, Guangzhou 510070, Guangdong, China
Keywords:
road engineering;  tunnel entrance and exit;  transition length;  lateral clearance;  parameter estimation
PACS:
U411
DOI:
-
Abstract:
The lateral width of tunnel's inside and outside in some specifications was analyzed, the variation of vehicles' speed and lateral clearance was studied based on the actual measurement, the relationship between the change of speed and lateral clearance with transition length was established, then the transition time and gradient rate were proposed. According to the theory of large sample interval estimation of parameters in mathematical statistics, the calculation methods on transition time and gradient rate of transition length at tunnel entrance and exit were presented by the statistical inference of the section speed and section lateral wide value. The conclusions show that the reasonable length at tunnel exit is longer than tunnel entrance, and the transition section length of tunnel entrances are more influenced by alignment index than the exit section, the gradient rate should be kept between 1/75 and 1/35. This study provides a quantitative analysis method to evaluate the rationality of traffic safety facilities on the tunnel entrances. 4 tabs, 4 figs, 14 refs.

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Last Update: 2012-08-20