TEST STUDY OF DEFORMATION LAW OF ENTRANCE SECTION FOR LOESS HIGHWAY TUNNEL
QIAO Xiong1，2，CHEN Jianxun1，WANG Mengshu3
(1. School of Highway，Chang?an University，Xi?an，Shaanxi 710064 China；2. School of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；3. School of Civil Engineering and Architecture，Beijing Jiaotong University，
Beijing 100044，China)
Abstract：In order to study the deformation law of entrance section for loess highway tunnel，based on the right line of Liujiaping No.2 tunnel of highway from Wubu to Zizhou in Shaanxi Province，in-situ tests were conducted. The tunnel construction deformation was measured，and the regression analysis was made in data processing of in-situ test. The results show that：(1) From the arch subsidence and clearance convergence data of the same time in two sections，it is found that the arch subsidence is greater than clearance convergence，so the arch subsidence should be mainly controlled during the construction：(2) The deformation data reflect the bias voltage of the portal section. (3) Tense curve of the arch subsidence is basically stable，the main indicator is the tense curve of subsidence gently rising，but the deformation rate decreases gradually which shows that the loess strata become stable；(4) The tense curves of 6 arch subsidence in two section are basically the same，it shows that although the sidewalls and inverted arch experience a tremendous spatial variation during the construction，there is no obvious mutation in the tense curve of the subsidence. The displacement law of the Malan new set loess stratigraphy was shown，and the time effect was more significant than spatial effect. The study results can provide a theoretical basis for the design and construction of the portal section，and a reference for similar tunnel project portal section construction.
乔 雄1，2，陈建勋1，王梦恕3. 黄土公路隧道洞口段变形规律测试研究[J]. 岩石力学与工程学报, 2013, 32(s2): 3552-3556.
QIAO Xiong1，2，CHEN Jianxun1，WANG Mengshu3. TEST STUDY OF DEFORMATION LAW OF ENTRANCE SECTION FOR LOESS HIGHWAY TUNNEL. , 2013, 32(s2): 3552-3556.
刘春龙，朱苦竹. 黄土隧道洞口浅埋偏压段关键施工技术研究[J]. 西南公路，2011，(4)：155-158.(LIU Chunlong，ZHU Kuzhu. Research on key constructed technology in shallow buried and unsymmetrical loading loess tunnel?s port[J]. Southwest Highway，2011，(4)：155-158.(in Chinese))
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2013, Vol. 32 
