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Erschienen in:
2014 | OriginalPaper | Buchkapitel
2. Field Tests
verfasst von : Yiqun Tang, Jie Zhou, Xingwei Ren, Qi Yang
Erschienen in: Dynamic Response and Deformation Characteristic of Saturated Soft Clay under Subway Vehicle Loading
Verlag: Springer Berlin Heidelberg
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Abstract
Subjected to the saturated soft clay surrounding tunnel areas of the Jing’an Temple Station-Jiangsu Road Station in Shanghai Line 2, continuous dynamic field monitoring was conducted by numbers of earth pressure and pore pressure transducers at different locations and depths. Some significant conclusions were obtained as follows:
1.
During the subway train passing over, two dynamic response frequencies were generated in surrounding saturated soft clay. According to the measured dynamic response frequencies in soil and corresponding natural soil frequency, some appropriate measurements should be considered to avoid similar or same frequencies between these two to induce resonance, which will result in great damage to the subway tunnel.
2.
In the direction perpendicular to the subway tunnel axis, the traffic load attenuated with increasing distance. The dynamic response attenuation with distance can be predicted in a formula by statistical analysis. The range of influence and the dynamic response amplitude were also obtained.
3.
The dynamic response amplitude varied linearly with the depth. And the values in different rush hour stages were various, largest in the morning rush hours, secondary in the evening, and least at noon. It indicated that the passage flow was largest in the morning. During this stage, the soil was in a worst situation and the dynamic response values in this period should be chosen as the reference in the subway tunnel design and construction.
4.
The pore pressure of saturated soft clay had very distinct response characteristics with the subway traffic load, and closer to the tunnel, the response is more sensitive.
5.
The dynamic response of pore pressure in saturated soft clay had hysteresis effect. Besides the distance between measuring point and subway track, it also has some relation to the loading direction.
6.
The pore pressure dissipation in saturated soft clay was much slower than the increasing time of pore pressure when subjected to the subway traffic load.