| 软黏土中地下结构浮力测试试验与分析 |
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| 引用本文： | 宋林辉,王宇豪,付磊,梅国雄.软黏土中地下结构浮力测试试验与分析[J].岩土力学,2018,39(2):753-758. |
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| 作者姓名： | 宋林辉 王宇豪 付磊 梅国雄 |
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| 作者单位： | 1. 南京工业大学 数理科学学院，江苏 南京 211800；2. 广西大学 土木建筑工程学院，广西 南宁 530004 |
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| 基金项目： | 国家自然科学基金（No. 41472283）；江苏省博士后基金（No. 2017087B）。 |
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| 摘 要： | 浮力计算是地下结构抗浮设计的关键，而弱透水黏性土中浮力大小的确定一直存在争议。对此，设计一套免受摩擦力影响的模型试验装置，对埋置于软黏土中的地下结构模型进行浮力测试。试验采用卸重上浮的思路，力学模型简单明确，浮力即等于浮起瞬间的剩余配重，并通过水压和位移的实时监测来判定结构上浮的临界状态。试验结果表明，软黏土中的水压是一个动态变化量，受渗流、温度、卸重回弹以及土-水相互作用的影响，且往往小于理论水压；实测浮力是理论浮力的0.93倍，存在少量折减；水压和位移时程曲线显示上浮过程是持续动态变化的，最终浮起时具有突发性。
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| 关 键 词： | 模型试验 地下结构 浮力 软黏土 |
| 收稿时间： | 2016-02-29 |
Test and analysis on buoyancy of underground structure in soft clay |
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| SONG Lin-hui,WANG Yu-hao,FU Lei,MEI Guo-xiong.Test and analysis on buoyancy of underground structure in soft clay[J].Rock and Soil Mechanics,2018,39(2):753-758. |
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| Authors: | SONG Lin-hui WANG Yu-hao FU Lei MEI Guo-xiong |
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| Institution: | 1. School of Physical and Mathematical Sciences, Nanjing Tech. University, Nanjing, Jiangsu 211800, China; 2. College of Civil Engineering and Architecture, Guangxi University, Nanning, Guangxi 530004, China |
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| Abstract: | Calculation of buoyancy plays an important role in the anti-floating design of underground structures. However, the determination of the buoyancy in weakly permeable clay is controversial. An apparatus of model test is designed to avoid the effect of the friction in the determination of the buoyancy of underground structure in soft clay. The weight unloading is adopted in a simple and explicit mechanical model. The buoyancy is equal to the surplus weight at floating moment. And the critical state of floating is determined by the real-time monitoring of pore pressure and displacement. Results of experiment show that the varying pore pressure in soft clay is influenced by seepage, temperature, unloading rebound, and soil water interaction, and the quantity is often less than the theoretical water pressure. Measured buoyancy is 0.93 times theoretical value, which presents a small amount of reduction. The real-time curves of water pressure and displacement indicate that the floating of structure is a continuous and dynamic process till to suddenly occur. |
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| Keywords: | model test underground structure buoyancy soft clay |
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