[1]喻军,刘松玉,童立元.小净距隧道设计荷载的确定[J].东南大学学报(自然科学版),2008,38(5):856-860.[doi:10.3969/j.issn.1001-0505.2008.05.022]
 Yu Jun,Liu Songyu,Tong Liyuan.Determination of designing load of small clear space tunnel[J].Journal of Southeast University (Natural Science Edition),2008,38(5):856-860.[doi:10.3969/j.issn.1001-0505.2008.05.022]
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小净距隧道设计荷载的确定()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
38
期数:
2008年第5期
页码:
856-860
栏目:
土木工程
出版日期:
2008-09-20

文章信息/Info

Title:
Determination of designing load of small clear space tunnel
作者:
喻军 刘松玉 童立元
东南大学交通学院,南京 210096
Author(s):
Yu Jun Liu Songyu Tong Liyuan
School of Transportation, Southeast University, Nanjing 210096, China
关键词:
小净距隧道 理论分析 设计荷载 塌落拱 中夹岩墙
Keywords:
small clear space tunnel theoretical analysis designing load slumping arch middle-rock wall
分类号:
TU415
DOI:
10.3969/j.issn.1001-0505.2008.05.022
摘要:
为了提高小净距隧道的设计理论水平,分析了小净距隧道的受力情况.塌落拱的高度一般在3~4 m(隧道宽度15 m),小净距隧道中夹岩墙宽度只有5~7 m,在施工过程中,2个隧道的松动圈会出现重叠,使中夹岩墙产生较大的垂直向下位移,从而增加了塌落拱的跨度,中夹岩墙上部的应力相应增加.基于双塌落拱理论,认为小净距隧道松动压力的计算值应在单个隧道宽度与整个隧道开挖宽度相应的松动压力之间取值,根据中夹岩壁下沉的大小,在双塌落拱压力上乘以0.5~0.8的系数,来确定小净距隧道的荷载,建立了深、浅埋小净距隧道荷载模式.将该方法确定荷载与福州国际机场高速公路鹤上隧道(小净距)的监测数值进行对比,两者有较好的吻合.
Abstract:
Force analysis to small clear space tunnel was conducted in this study. It has already been studied that the height of slumping arches could be over 3 to 4 m if the width of tunnel approaches 15 m. For small clear space tunnel, because the width of middle-rock wall is as small as 5 to 7 m, the loosening zone of two tunnels could be overlaid during the process of construction which results a large vertical displacement of middle-rock wall and leads to the augment of span of slumping arch and stress raising of the up part of middle-rock wall. Based on the two slumping arches assumption, a new load-design method of small clear space tunnel was put forward which considered that the value of loosening pressure of small clear space tunnel was between the value of single tunnel excavation and that of two tunnels. A correction factor was adopted by multiplying the pressure of two slumping arches to get the final load confinement of small clear space tunnel. The values range of correction factor was suggested between 0.5-0.8 which based on the vertical displacement of middle-rock wall. The load modes of deep and shallow small clear space tunnel were presented. For comparison purpose, a case study of small clear space tunnel, Heshang tunnel of Fuzhou international airport highway was conducted. The results showed that the pressure calculated by the method presented in this study was consisted with the site-monitoring data.

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备注/Memo

备注/Memo:
作者简介: 喻军(1978—),男,博士生; 刘松玉(联系人),男,博士,教授,博士生导师, Liusy@seu.edu.cn.
基金项目: 福建省交通厅交通科技发展资助项目(2004-318-490-18).
引文格式: 喻军,刘松玉,童立元.小净距隧道设计荷载的确定[J].东南大学学报:自然科学版,2008,38(5):856-860.
更新日期/Last Update: 2008-09-20