STUDY OF RELATIVE LIMIT DISPLACEMENT MODEL OF PRIMARY SUPPORT IN TWIN-TRACK TUNNEL CONSIDERING EFFECT OF MULTI-FACTORS
LIU Fangbiao1，WU Shunchuan1，2，GAO Yongtao1，2，LI Jian1，XIONG Feng3
(1. School of Civil and Environment Engineering，University of Science and Technology Beijing，Beijing 100083，China；
2. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines，University of Science and Technology Beijing，Beijing 100083，China；3. School of Traffic and Transportation，Beijing Jiaotong University，Beijing 100044，China)
Abstract：Relative limit displacement U0/U of tunnel primary support is an important judgment index of surrounding rock and support system stability. U0/U values defined by related standards range for different surrounding rock grades and embedded depth，making surrounding rock stability judgment more flexible. To get more exactly value of U0/U under various tunnels and mechanical parameters，finite difference method(FDM) is adopted to research correction factor K4 showing the influence of pan length B on [BQ]，and modified rock quality index [BQ]－B is established. Multi-nonlinear regression technology is used to fit the relation among U0/U，[BQ]－B and embedded depth h in twin-track tunnel. Then the model of relative limit displacement of primary support under multi-factors is founded. As the influence of multi-factors on U0/U has been considered synthetically and the quantitative value for U0/U is defined in the model，the model makes up for deficiencies of current standards and provides new methods and thoughts for exact surrounding rock stability judgment. Besides，the functional relations are helpful for information programming and application. Observed data from Shanping highway tunnel has been adopted to verify the applicability that the model founded to deep-buried soft rock，hallow-buried loess and deep-buried hard rock tunnel，providing reference for similar tunnels.
刘芳标1，吴顺川1，2，高永涛1，2，李 健1，熊 峰3. 考虑多因素影响的双线隧道初支极限相对位移模型研究[J]. 岩石力学与工程学报, 2012, 31(s2): 3625-3631.
LIU Fangbiao1，WU Shunchuan1，2，GAO Yongtao1，2，LI Jian1，XIONG Feng3. STUDY OF RELATIVE LIMIT DISPLACEMENT MODEL OF PRIMARY SUPPORT IN TWIN-TRACK TUNNEL CONSIDERING EFFECT OF MULTI-FACTORS. , 2012, 31(s2): 3625-3631.
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2012, Vol. 31 
