|Table of Contents|

Time-space effect in fractional steps construction tunnels by key block theory(PDF)

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

Issue:
2011年02期
Page:
57-62
Research Field:
Publishing date:
2011-04-30

Info

Title:
Time-space effect in fractional steps construction tunnels by key block theory
Author(s):
CHEN Xiao-xiang1;  XIA Cai-chu2;  MIAO Yuan-bing3
1. Fujian Electric Power Survey and Design Institute, Fuzhou 350003, Fujian, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Fujian Communications Planning and Design Institute, Fuzhou 350004, Fujian, China
Keywords:
tunnel engineering;  rock tunnel;  key block;  construction procedure;  time-space effect
PACS:
U455; O319.56
DOI:
-
Abstract:
The key block's time-space effect is existed because of the location or the size and the time of the key block when the tunnel was excavated in fractional steps construction. The definition of time-space effect of the key block is described, and then based on the Jinjishan tunnel which is extra-large eight spans multi-arch tunnel in the second stage of the Fuzhou Changle international airport highway project, the definition and the application of the time-space effect is explained in detail. The basic application principle of the time-space effect of key block is put forward. The analysis shows that the stability of the upper blocks in the tunnel could be improved by reservating the core part rock in the two side-wall pilot tunnel, the key block volume could be controlled by limiting the free face area, the mechanic properties of the joints could be weaken caused by creeping because of supported in time, and the temporary support could be reduced by the application of the guiding fundamental principles of key block, so that the safety and the economic efficiency are raised in the tunnel construction procedure. 4 tabs, 5 figs, 14 refs.

References:

[1] Jun L,Zhongkui L,Zhuoyuan Z.Stability analysis of block in the surrounding rock mass of a large underground excavation[J].Tunneling and Underground Space Technology,2004,19:35-44.
[2]李德宏.连拱隧道施工监测与分析[J].现代隧道技术,2003,40(1):59-64. LI De-hong.Construction monitoring of multi-arch tunnel and its result analysis[J].Modern Tunneling Technology,2003,40(1):59-64.
[3]Goodman R E,Shi G H.Block theory and its application to rock engineering[M].Englewood Cliffs:Prentice-Hall,1985.
[4]毛海和,夏才初,张子新,等.块体理论赤平解析法在龙滩水电站地下厂房洞室群稳定分析中的应用[J].岩石力学与工程学报,2005,24(8):1308-1314. MAO Hai-he,XIA Cai-chu,ZHANG Zi-xin,et al.Application of stereo-analytical method for block theory to the stability of Longtan hydropower station underground power-house[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(8):1308-1314.
[5]Song J J,Lee C I,Seto M.Stability analysis of rock blocks around a tunnel using a statistical joint modeling technique[J].Tunneling and Underground Space Technology,2001,16,341-351.
[6]杨 庆,杨 钢,王忠昶,等.块体理论在荒沟抽水蓄能电站地下厂房系统硐室群围岩稳定性分析中的应用[J].岩石力学与工程学报,2007,26(8):1618-1625. YANG Qing,YANG Gang,WANG Zhong-chang,et al.Application of block theory to surrounding rock stability of underground caverns in Huanggou pumped storage station[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(8):1618-1625.
[7]魏继红,吴继敏,陈显春,等.块体理论在高速公路连拱隧道超挖预测中的应用[J].水文地质工程地质,2005(5):60-63. WEI Ji-hong,WU Ji-min,CHEN Xian-chun,et al.Application of block theory on over break forecast in double-arch tunnel[J].Hydrogeology & Engineering Geology,2005(5):60-63.
[8]怀 超.关键块体理论在高速公路连拱隧道围岩稳定性分析中的应用[D].西安:长安大学,2005.
[9]夏才初,孙宗颀.工程岩体节理力学[M].上海:同济大学出版社,2002.
[10]张汝良.福州长乐国际机场高速公路二期工程A6合同段金鸡山隧道工程地质评价报告[R].福州:福建省交通规划设计院,2007.
[11]GB 50086—2001,锚杆喷射混凝土支护技术规范[S].
[12]夏才初,陈孝湘,许崇帮,等.特大跨度隧道岩体节理的精细化描述及其块体稳定性分析[J].岩石力学与工程学报,2010,29(增1):13-20. XIA Cai-chu,CHEN Xiao-xiang,XU Chong-bang,et al.Fine description of rock joint combined with block theory and its applications in extra-large cross-section multiple-arch tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(S1):13-20.
[13]王毅才.隧道工程[M].2版.北京:人民交通出版社,2008.
[14]缪圆冰.福州长乐国际机场高速公路二期工程A6合同段金鸡山隧道工程设计方案[R].福州:福建省交通规划设计院,2007.

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Last Update: 2011-04-30