特长公路隧道通风竖井施工阶段稳定性分析.pdf

第39卷,第6期
公路工程
Vol 39, No 6
2014年12月
ignway Engineering
Dec.,2014
特长公路隧道通风竖井施工阶段稳定性分析
汪迎红
(贵州交通职业技术学院,贵州贵阳550008)
[摘要]结合某隧道2“通风竖井施工项目,采用数值模拟的方法,分析了竖井及风道的施工对围岩村砌稳定
性的影响。研究结果表明:竖井开挖初期,衬砌压应力、壁座拉应力和位移量均随着竖井的开挖逐步増大,最大值
分别为8.1MPa、1.03MPa和2.62mm。开挖到第五步和第六步时对衬砌的应力和位移影响最为不利,应采取相
应的保护措施。风道开挖后拱底上拎、拱顶下沉,拱底衬砌最大位移量为3.2mm,临近竖井部位村砌拉应力值达
到3.76MPa,可能对初期村砌造成局部破坏。竖井和风道连接部位衬砌和围岩均出现拉应力集中,最大拉应力值
分别达到3.8MPa和1.6MPa,围岩最大上抬位移为2.66m,竖井和风道连接部位出现局部破损,在实际工程的
施工中需予以加固。
关键词]道路工程;竖井施工;数值分析;稳定性;公路隧道
[中图分类号]U453.5[文献标识码]A
[文章编号]1674-0610(2014)06-0219-04
Analysis the Stability of Construction Stage of Extra-long
Highway Tunnel Ventilation Shaft
WANG Yinghong
( Guizhou Communications Vocational and Tehnical College, Guiyang Guizhou 550008, China
Abstract] The influence of the construction of shaft and air on the stability of rock-lining is ana
lyzed with simulation method which combine the construction project of a tunnel 2 "ventilation shaft. Re
sults show that compressive stress, walling crib tensile stress and displacement increase gradually with the
excavation of shaft on the beginning of vertical shaft excavation, and te maximum is8. 1 Mpa, 1.03
Mpa and 2. 62 mm respectively. The effects on stress and displacement of the lining is adverse at step 5
and step 6 that should take protection measures corresponding. The maximum displacement of arch bottom
lining is 3. 2 mm, and tensile stress value of lining near to shaft is 3.76 Mpa caused by arch bottom u
and vault subsidence after wind tunnel excavation, which may lead local damage to the lining. Stress
concentration occurs in the lining and surrounding rock on the connection parts of shaft and wind tunnel
and the maximum tensile stress value reach to 3.8 Mpa and 1.6 Mpa, the largest lift displacement of sur
rounding rock is 2. 66 mm, which lead a local damage on the connection parts of shaft and wind tunnel
and it need to be reinforced in actual construction proiect
I Key words] road engineering; shaft construction; numerical analysis; stability; highway tunnel
0引言
法,结合某隧道2通风竖井施工项目,研究竖井及
风道的开挖对围岩衬砌应力场和位移场的影响,确
由于具有效率高、工期短、技术成熟、运营维抑保施工质量,保证施工安全。
费用低等优势,我国特长公路隧道一般采用竖井通
风-21。但是,隧道通风竖井通常处于高山陡坡,地1工程概况
质条件差异大,此外,竖井施工机械化水平和管理水
某隧道左线全长6750m,里程ZK1+915
平等问题还没有很好解决,使得竖井施工质量和施ZK8+665,右线全长6765m,里程YK1+925
工安全不能得到保证?。本文采用数值模拟的方YK8+690。由一、二合同段对掘施工,其中二合同
收稿日期]204-03-20
[作者简介]汪迎红(1968-),女,贵州金沙人,副教授,专业方向为公路与桥梁。