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| Model Test Research on Dynamic Characteristics of the Underlying Soil for Subway Tunnel |
| LIU Zhi － qiang1，WANG Fei1，YAO Bo2 |
| 1． China University of Mining and Technology，Xuzhou，Jiangsu 221116，China; 2． Sino － coal International Engineering Group，Shenyang，Liaoning 110015，China |
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Abstract Research purposes: The settlement of subway tunnel in different level will be caused under the long － time vehicle dynamic load and it brings unfavorable effects on the stability of subway operation． The settlement is clearer especially in the saturated soft clay． It will help us to correctly understand the subway operation load of the surrounding soil by carrying out soil dynamic stability research under subway tunnel and provide the basis for soil around tunnel reinforcement．
Research conclusions: Based on the analysis of stress characteristic during subway operation，a simulated experimental system is researched and built up． This paper investigated the dynamic stability of underlying silty clay of shield tunnel by model test． The dynamic characteristic in different amplitude and frequency of dynamic load was researched，also we analyzed the settlement of the subway tunnel． The test results shows that，the dynamic response of underlying silty clay presented attenuation trend with the increasing of space，the attenuation was more obvious when the distance was smaller，and the larger the value of dynamic load peak，the greater the tunnel settlement． The lower frequency，the greater the vertical settlement when the dynamic load has the same value and the vibration frequency is constant．
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Received: 18 May 2011
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2011, Vol. 28 
