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| ANALYSIS OF GROUND SURFACE DISPLACEMENT AND HORIZONTAL MOVEMENT OF DEEP SOILS INDUCED BY SHIELD ADVANCING |
| LIANG Rongzhu1，2，XIA Tangdai1，2，LIN Cungang3，YU Feng4 |
(1. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China；3. College of Civil Construction and Environmental Engineering，Ningbo University，Ningbo，Zhejiang 315211，China；4. School of Civil
Engineering and Architecture，Zhejiang Sci-Tech University，Hangzhou，Zhejiang 310018，China) |
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Abstract In this study，ground surface displacements and horizontal movements of deep soils associated with shield tunnelling were derived on the basis of the elastic Mindlin?s solutions. The pressures induced by the compressing effect of cutter-head，the non-uniform distribution of softening skin frictions along the shield in soft soils，the grouting pressures at shield tail and the soil movements caused by soil loss were considered in the proposed solution. This method was verified against three case histories and good agreement was achieved between the predictions and measurements，showing that the method was able to capture the tendency of soil movements induced by shield progressing. The shield construction was found to be responsible for the ground heave in front of the shield face and the distribution of heave resembled a normal distributed curve. High grouting pressure at shield tail was found to be another cause of the ground heave. The deep soils in the transverse direction of shield advancing were compressed during shield progressing and moved away from the center line of shield. The maximum horizontal soil movement occurred near the center line of the shield.
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Received: 13 April 2014
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2015, Vol. 34 
