| 超固结比对黏土热固结特性的影响研究 |
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| 引用本文： | 刘铨,邓岳保,毛伟赟,孔纲强.超固结比对黏土热固结特性的影响研究[J].防灾减灾工程学报,2019(4):607-614. |
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| 作者姓名： | 刘铨 邓岳保 毛伟赟 孔纲强 |
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| 作者单位： | 宁波大学岩土工程研究所, 浙江 宁波 315211;河海大学岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098 |
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| 基金项目： | 河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(201808)、浙江省自然科学基金项目(LY17E080008)资助 |
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| 摘 要： | 通过开展固结压缩试验,研究了超固结比(OCR)对海相沉积软黏土热固结特性的影响。试验结果表明:加温可能使软土发生沉降或回弹。在OCR较小的情况下,加温将使软黏土产生沉降;OCR越小,温度效应导致的沉降量越大,降温后回弹较少。在OCR较大的情况下,加温将使软土产生膨胀;降温后膨胀可部分恢复,且OCR越大恢复量越大。在此基础上,根据测试结果拟合了考虑OCR影响的热固结经验关系式。该式可用来预测不同应力状态条件下软土应变随温度变化的关系。
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| 关 键 词： | 软黏土 热固结 超固结比 经验公式 |
The Influence of Over Consolidation Ratio on Thermal Consolidation Properties of Clay |
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| Liu Quan,Deng Yuebao,Mao Wei,Kong Gangqiang.The Influence of Over Consolidation Ratio on Thermal Consolidation Properties of Clay[J].Journal of Disaster Prevent and Mitigation Eng,2019(4):607-614. |
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| Authors: | Liu Quan Deng Yuebao Mao Wei Kong Gangqiang |
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| Institution: | Institute of Geotechnical Engineering, Ningbo University, Ningbo 315211 , China; Key Laboratory of Geomechanics and Embankment Engineering Hohai University, Ministry of Education, Nanjing 210098 , China |
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| Abstract: | A series of thermal consolidation compression tests were carried out in this paper. The effect of over consolidation ratio (OCR) on the thermal consolidation characteristics of typical soft clay in Ningbo area was studied. The results show that heating may cause settlement or rebound of soft soil. In the case of small OCR, heating will cause soft clay to subside, and the smaller the OCR, the larger the settlement, and the lesser rebound after cooling. When the OCR is large, the heating will cause the expansion of soft soil. The expansion will partially recover after cooling, and the larger the OCR, the greater the recovery. Based on the test results, the empirical relationship of thermal consolidation considering the influence of OCR was fitted. This formula can be used to predict the relationship between strain and temperature of soft soil under different stress conditions. |
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