摘要
乌池坝隧道是沪蓉西高速公路恩施至利川段的控制性工程。随着隧道的开挖,岩体沿其切割结构面或临空面产生整体或局部移动,导致围岩失稳而不能施工。针对隧道施工揭露的围岩地质信息,通过几何分析和力学分析,研究该隧道ZK259+738～ZK259+768段围岩不定位块体的空间分布,识别关键块体及其破坏类型,并对比运用UNWEDGE软件建立了该段隧道和围岩块体的三维模型,对其中关键块体进行稳定性评价,计算加固所需的锚固力。研究表明,在超前预报中根据隧道施工的围岩地质信息可以有效地识别围岩块体,获得不定位块体分布状况、查明关键块体,在工程实际块段能确定相应块体稳定性系数及工程安全所需锚固力。
Wuchiba tunnel is a key project of Enshi to Lichuan section in HuRong expressway. In tunnel engineering, the stability of rock is controlled by the number of blocks, i.e. the size, orientation and locations of the discontinuities. Key block failures occur where blocks of rock which are separated from the rest of the rock mass by discontinuities slide of fall into an excavation. In the present paper, according to geometric and mechanical analysis, we identify the distribution of unlocated blocks and failure modes of key blocks in ZK259 ＋ 738 - ZK259 ＋ 768 section of wuchiba tunnel. Besides, using Unwedge program for a comparison, and create the three-dimensional structural model of this section of the tunnel and blocks. The quantitative data and stability of all key blocks are analyzed by means of data of key blocks, according to geologi Unwedge program. The research shows that the distribution of unlocated blocks, the quantitative safety factors of the blocks and required anchor force in practical project section are identified cal information of surrounding rock in the advanced prediction.
出处
《山地学报》
CSCD
北大核心
2009年第2期230-234,共5页
Mountain Research
基金
教育部新世纪优秀人才支持计划(NCET-07 -0775)~~
关键词
乌池坝隧道
围岩
超前预报
不定位块体
块体稳定性
Wuchiba tunnel
surrounding rock
advanced prediction
unlocated block
block stability
