浅埋黄土隧道中系统锚杆支护作用的数值模拟 (2011年)
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长安大学学报(自然科学版)
第
31
卷第
1
期
2011
年
1
月
Journal
of
Chang'an
University(Natural
Science
Edition)
文章编号
:1671-8879(2011)01-0059-04
Vo
l.
31
No.1
Jan.
2011
浅埋黄土隧道中系统锚杆支护作用的数值模拟
陈建勋
1
，轩俊杰
1.2
，乔雄1.
3
(1.长安大学公路学院，陕西西安
710064;
2.
西北民族大学土木工程学院，甘肃兰州
730030;
3.
兰州理工大学土木工程学院，甘肃兰州
730050)
摘
要:为了研究系统锚杆在浅埋黄土隧道中的支护效果，以陕西吴堡一子洲高速公路刘家坪
5
号
隧道为依托，利用
MIDAS/GTS
有限元分析软件分别建立有、无系统锚杆的分析模型，计算分析了
6
个开挖阶段和截止到二衬施作阶段的隧道变形量，并将数值模拟结果与实测结果进行了对比分
析。结采表明:浅埋黄土隧道施工过程中，有系统锚杆的隧道变形值大于无系统锚杆的变形值，这
是由于锚杆是在钢架支设后进行打设，锚杆的打设不仅破坏了土体的稳定，而且延误了喷射混凝土
和钢架支护的最佳时机.使变形量增加;有、无系统锚杆拱顶下沉和净空收敛的现场实测值基本处
于同一数量级，说明在浅埋黄土隧道中系统锚杆的作用不显著，可以取消。
关键词:隧道工程;黄土;浅埋;系统锚杆;拱顶下沉;数值模拟
中图分类号
:U45
1.
2
文献标志码
:A
Numerical simulation of support action of systematic
anchorage bolts in shallow-buried loess tunnel
CHEN
Jian-xun
1
,
XUAN
Jun-jie
1.
2.
QIAO
Xiong
1.
3
(1. School of Hlghway. Chang'an Umverslty. Xi'an 710064. Shaanxi. China;
2.
School of Civd Engmeering. Northwest Umversity for Nationalitles , Lanzhou 730030. Gansu. Chma;
3.
School of Clvil Engmeenng , Lanzholl University of Technology. Lanzholl 730050 , Gansll , China)
Abstract:
In
order
to
study
the
actional
function
of
systematic
anchorage
bolts
in
shallow-buried
loess
tunnel.
this
paper
taking
Liujiaping
5
二
tunnel
of
Wubao-Zizhou
freeway
as
an
example
,
two-dimensional
plane
models
wlth
systematic
anchorage
bolts
and
without
systematic
anchorage
bolts
were
established
by
using
the
finite
element
analysis
software
MIDAS/GTS.
In
the
process
of
numerical
analysis.
the
displacement
amounts
were
simulated
during
the
six
excavation
stages
and
the
stage
before
secondary
lining
construction.
and
the
numerical
simulating
results
were
compared
with
the
ones
of
measuring.
The
results
show
that
the
displacement
of
the
model
with
systematic
bolts
is
bigger
than
that
of
the
model
without
systematic
bolts
during
the
construction
of
shallow
•
buried
loess
tunnel.
because
the
rock
bolts
are
constructed
after
steel
arch.
Construct
ing
the
anchorage
blots
,
not
only
the
stability
of
soil
mass
is
broke.
but
also
the
best
time
of
con
structing
shotcrete
and
steel
support
is
delayed.
Moreover.
both
the
two
modes
have
almost
the
same
settlement
in
the
tunnel
arch
crown
and
horizontal
convergence
during
in-situ
test.
Through
收稿日期
:2010-03-10
基金项目:国家西部交通建设科技项目
(200731881268)
;陕两省交通科技项目
(08-06K)
作者简介:陈建勋
0969-).
男.陕西韩城人.教授
.E-mall:chenjxI969@;163.
com
o
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