Abstract：Research purposes： In stratiform strata, the uniform falling and rising of underground water level will cause the stratiform expansion of expansive rock and soil strata to affect the load on shield tunnel lining structure. The equation for the stress formation caused by stratiform expansion was deduced and numerical calculations were carried out for the outside pressure on the lining structure when the stratiform expansion happened to the expansive soils mass above and below the tunnel and on both sides of tunnel.
Research conclusions ： (1) As the soil physical parameters change，the stratiform expansion of soil mass will bring about the change of the outside pressure on the structure and generate the additional load. This expansive load is related to the expansion force and the free expansivity of the expansive soil. (2) When the stratiform expansion of expansive soil mass appears above or below the tunnel, the expansive load is small, and is less affected by the expansion force, thickness of expansive soil and distance between tunnel and expansive soil mass. (3 ) When the stratiform expansion of expansive soil happens on both sides of tunnel, the outside pressure on the tunnel structure increases largely, and the load increases with the increase of expansion force of the expansive soil. However, a certain expansion scope and expansion force are beneficial to the load on tunnel structure. (4) The research results can be used for guiding the sampling values of expansive load in design of shield tunnel structure.
方勇，崔戈，符亚鹏，杨斌. 膨胀地层层状膨胀对盾构隧道结构荷载影响[J]. 铁道工程学报, 2013, 30(7): 59-64.
FANG Yong, CUI Ge, FU Ya-peng, YANG Bin. Influence of Stratiform Expansion of Expensive Strata on Structure Load of Shield Tunnel. 铁道工程学报, 2013, 30(7): 59-64.
Chen Shanxiong, Yu Song, Kong Lingwei, etc. Study on Approach to Identification and Classification of Expansive Soils[J]. Rock and Soil Mechanics, 2005 (12)： 1895-1900.
Wei Bingxu. Experimental Research on Lateral Restricted Swelling Strain of Expansive Soi[ J]. Journal of Highway and Transportation Research and Development, 2007(10) ：48 -52.
Wang Nianxiang, Zhang Weimin, Gu Xingwen, etc. Lateral Swelling Pressure of Expansive Soil Acting on Retaining Wall Due to Inundation [ J ]. Journal of Hydraulic Engineering, 2008(5) ：580 -587.
Huang Bin, Rao Xibao, Wang Zhangqiong, etc. Experimental Study of Expansion Model of Expansive Soil Considering State Water Content and Density [ J ].Rock and Soil Mechanics, 2011 (SI) ：397 - 402.
[8]郭瑞,何川，方勇.膨胀土地层中盾构隧道管片结构受力 分析与对策研究[J]_现代隧道技术，2010(6) ：17 -22. Guo Rui, He Oman, Fang Yong. Analysis on Mechanical Behavior of Shield Tunnel Segmental Lining in Swelling Ground and Countermeasures [ J ].Modern Tunnelling Technology, 2010(6) ：17 -22,
Lin Gang, Luo Shlpei, Guo Jun, etc. Study on Structural Behavior of a Shield Tunnel in Swelling Rock and Soil Strata [ J ]. Modern Tunnelling Technology， 2011(3) ：74-79.
[10]Urs H. Gnmlcke，Mladen Risti. Pre - stressed Tunnel Lining - pushing Traditional Concepts to New Frontiers [J]. Geomechanics and Tunnelling，2012 (5) ： 503 - 516.
2013, Vol. 30 
版权所有 © 2014 《铁道工程学报》编辑部