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| Research on the Law and Prediction of Long - term Settlement of Shield Tunnel in Soft Soil Stratum |
| YANG Bing - ming |
| (Beijing Jiaotong University, Beijing 100044, China) |
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Abstract Research purposes ： Model test is one of the most important methods for studying the problem of tunnel engineering. For analyzing the key reasons of long - term settlement in soft soil stratum in Ningbo, engineering characteristics of the first line of Ningbo rail transit in soft soil stratum is considered, and long - term settlement of muddy clay and sand is effectively simulated with centrifugal model test. The effect of soil moisture content of the soft soil stratum is taken into account, whether seepage water effect on a long - term settlement of shield tunnel.
Research conclusions:(1) The moisture content of the soft soil stratum has great effect on the long - term settlement of the tunnel. The long - term settlement of the tunnel can be expressed as floating or sinking with different the moisture content. (2) The tunnel is not easy to follow a stable settlement in muddy clay stratum, but the tunnel is fast stable of the soil settlement in sand stratum when the sand stratum leaks water. ( 3 ) The centrifuge model test and the logarithmic curve method have the same value, and the logarithmic curve prediction model provides technical reference for the actual construction.
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Received: 18 July 2015
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2015, Vol. 32 
