深圳大学学报理工版

曹光形,邓岳保,俞磊,等.考虑软土超固结的静钻根植能源桩模型试验[J].深圳大学学报理工版,2022,39(01):93-100.[doi:10.3724/SP.J.1249.2022.01093]
CAO Guangxing,DENG Yuebao,YU Lei,et al.Model test of static drilling and rooted energy pile considering over-consolidated behavior of soft soil[J].Journal of Shenzhen University Science and Engineering,2022,39(01):93-100.[doi:10.3724/SP.J.1249.2022.01093]

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考虑软土超固结的静钻根植能源桩模型试验

曹光形¹，邓岳保¹，俞磊¹，张日红²

1.宁波大学滨海城市轨道交通协同创新中心，浙江宁波315211;2.宁波中淳高科股份有限公司，浙江宁波315042

关键词：岩土工程;能源桩;软土;模型试验;超固结;静钻根植能源桩

Model test of static drilling and rooted energy pile considering over-consolidated behavior of soft soil

CAO Guangxing¹，DENG Yuebao¹，YU Lei¹，ZHANG Rihong²

1.Coastal Urban Rail Transit Collaborative Innovation, Ningbo University, Ningbo 315211, Zhejiang Province, P. R. China;2.Ningbo Zhongchun Hi-Tech Co. Ltd. , Ningbo 315042, Zhejiang Province, P. R. China

Keywords：geotechnical engineering;energy pile;soft soil;model test;over-consolidation;static drilling and rooted energy pile

DOI: 10.3724/SP.J.1249.2022.01093

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参考文献

为研究静钻根植能源桩在不同固结状态软土中的承载特性，基于能源桩模型试验系统，对比测试了模型桩在正常固结土和超固结土地基中的热力响应.结果表明，热量在桩周土层中的扩散程度随着与热交换管（热源）距离的增大而减小；土层的超固结状态影响土层中孔隙水压力的产生与消散，相比于正常固结土，超固结土层中孔压消散速率更慢；桩周软土在升温后的竖向变形首先表现为回弹，随后变成沉降，超固结土回弹明显，且随后的沉降量更小；桩身附加温度应力呈先增大后减小的趋势，超固结土下的桩身最大附加温度应力位置高于正常固结土，且升温产生的负摩阻力较小.静钻根植能源桩的承载特性与软土超固结状态密切相关，在工程设计中需要综合考虑以确保运行安全性.

In order to study the bearing characteristics of static drilling and rooted energy piles in soft soil with different consolidation states，based on the energy pile model test，the thermal response of the model piles in normal consolidated soil and over-consolidated soil is tested. The results show that the heat diffusion in the soil around the pile decreases with the increase of the distance away from the heat exchange tube （heat source）. The over-consolidation state of the soil layer affects the generation and dissipation of pore water pressure in the soil layer. Compared with the normal consolidated soil，the dissipation rate of the pore pressure in the over-consolidated soil layer is slower. The vertical deformation of the soft soil around the pile first manifests as rebound after the temperature rises，and then becomes settlement. Compared with the normal consolidated soil，the over-consolidated soil rebounds significantly，and the subsequent settlement is smaller. The additional temperature stress of the pile body increases first and then decreases；in the case of over-consolidated soil，the maximum additional temperature stress position of the pile body is higher than that in the case of normal consolidated soil，and the negative friction caused by heating is smaller. The bearing characteristics of statically drilled rooted energy piles are closely related to the over-consolidated state of soft soil，and comprehensive consideration is required in engineering design to ensure operational safety.

引言
1 模型试验
2 试验数据与分析
3 结论

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