隧道施工影响下城市复杂地层的变形机制及预测方法

doi:10.13722/j.cnki.jrme.2014.12.016

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Abstract Because of the complexity of the urban environment and the variability of the geological conditions，it is very important and difficult to predict the ground deformation accurately. The process and mechanism of ground deformation were analyzed systematically from three aspects，the materials，the meso-structures and the environment of ground layers. Three typical kinds of meso-structures were put forward to describe the characteristics of complex ground conditions and correspondingly the methods of stability analysis were established. According to the designated type of ground meso-structure and its spatial relation to tunnel，the quantitative relationship between the stability of the meso-structure and the macroscopic ground deformation was established，which predicted accurately the ground deformation and the surface subsidence caused by the instability of meso-structure. A model of calculating the ground deformation due to the water table fall and the loss of water and sand was established. Together with the elasto-plastic deformation of ground，the total ground deformations were thus be obtained and were found to agree very well with the measured data.

Key words： tunnelling engineering urban complex ground conditions meso-structure of ground stability ground deformation prediction

Received: 13 May 2014

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.12.016 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I12/2504

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