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| Influence of Stratiform Expansion of Expensive Strata on Structure Load of Shield Tunnel |
| FANG Yong, CUI Ge, FU Ya-peng, YANG Bin |
| Southwest Jiaotong University, Chengdu, Sichuan 610031, China |
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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.
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Received: 01 February 2013
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2013, Vol. 30 
