| 地铁振动荷载下隧道周边土体孔压响应特征研究 |
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| 引用本文： | 葛世平,姚湘静.地铁振动荷载下隧道周边土体孔压响应特征研究[J].工程地质学报(英文版),2015,23(6):1093-1099. |
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| 作者姓名： | 葛世平 姚湘静 |
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| 作者单位： | 1.同济大学地下建筑与工程系 上海 200092; |
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| 摘 要： | 本文依托上海地铁9号线开展地铁振动荷载下隧道周边土体孔隙水压力长期监测。监测结果表明:列车振动荷载施加后,超孔隙水压力迅速产生并急剧上升;隧道拱腰深度的超孔压约为1.2kPa;最后一班地铁列车通过后,孔隙水压力逐渐消散;停运5min时,超孔压消散80%左右。由于盾构施工产生的超孔压远比振动产生的超孔压大,现场测试主要表现为施工产生的超孔压消散。超孔压分布规律为:隧道拱腰以上,超孔压随深度有增大趋势,拱腰以下,超孔压随深度有减小趋势;拱腰周边,超孔压较大,超孔压等值线较密集。
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| 关 键 词： | 地铁振动 软黏土 超孔压 沉降 |
| 收稿时间： | 2015-04-08 |
RESPONSE CHARACTERISTICS OF PORE PRESSURE IN SOILS NEARBY METRO TUNNEL DUE TO TRAIN VIBRATION LOADING |
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| Institution: | 1.Department of Geotechnical Engineering, Tongji University, Shanghai 200092;2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092;3.Shanghai Shentong Metro Group Co., Ltd., Shanghai 201102 |
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| Abstract: | The pore pressure behavior of soils nearby the tunnel of Shanghai Metro Line 9 was investigated chronically. The results show that excess pore pressure generates rapidly when the train vibration loading is applied. The excess pore pressure is about 1.2kPa at arch waist depth. After the last train passes through, the pore pressure starts dissipating. By the time that the last train passes 5minutes, excess pore pressure dissipates 80 percent. The excess pore pressure generated by shield construction is much higher than that of metro vibration. Site testing mainly shows the excess pore pressure dissipation. The distributions of excess pore pressure are as follows:above tunnel vault pore pressure increases with depth; below the tunnel vault, pore pressure reduces as the depth increase; surround the tunnel vault, pore pressure is larger and pore pressure contours are denser. |
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