砂性土中隧道施工引起地层沉降分布特征的模型试验研究

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Abstract Researches of the settlement caused by tunnel construction mostly focus on the settlement at the ground surface at present. However，the increasing number of the failure cases of underground structures during tunneling reveals the importance of estimating the subsurface settlement. In order to solve this problem，sand of Yangtze River was filled in a self-developed model box with adjustable bottom on the box to simulate the tunneling effect. During the testing process，settlements were measured at different depths to investigate the subsurface movements caused by tunneling in sand. Test results show that the relationship of the maximum settlement at a given depth，the depth and the maximum bottom plate lowering distance is linear；the volume of settlement trough is not constant，it increases with the increasing depth. And it is only half of the volume of stratum loss；the settlement trough width parameter i is only related to the depth，and has no obvious relationship with the maximum settlement at the same depth.

Key words： tunnelling engineering tunnel construction sandy soil subsurface settlement settlement trough model test

Received: 02 November 2012

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