软土场地热固结对能源桩受力特性的影响研究
PDF下载 (246)俞 磊,邓岳保,张付林.软土场地热固结对能源桩受力特性的影响研究[J].宁波大学学报(理工版),2021,34(6):85-90.DOI:
YU Lei,DENG Yuebao,ZHANG Fulin.Effect of thermal consolidation on mechanical properties of energy pile in soft soil site[J].Journal of Ningbo University(Natural Science & Engineering Edition),2021,34(6):85-90.DOI:
| Title: | Effect of thermal consolidation on mechanical properties of energy pile in soft soil site |
| 作者: | 俞 磊, 邓岳保, 张付林 |
| Author(s): | YU Lei, DENG Yuebao, ZHANG Fulin |
| 关键词: | 能源桩; 热固结; 先期固结压力; 荷载传递模型; 黏聚力; 内摩擦角 |
| Keywords: | energy piles; thermal consolidation; preconsolidation pressure; load transfer model; cohesion; internal friction angle |
| 分类号: | TU411.5 |
| 文献标识码: | A |
| 摘要: | 能源桩具有较好的节能减排功效, 但软土场地能源桩的热交换会使桩周土产生明显的热固结沉降, 从而影响桩-土荷载传递规律及其承载特性. 本文根据温度效应的一维固结理论, 计算任意时刻桩周土体的热固结沉降, 结合佐腾悟双折线负摩阻力公式, 建立考虑桩周土温度效应的能源桩荷载传递模型. 算例分析表明 桩周土体的升温导致桩侧负摩阻力和桩身轴力增加, 中性点位置下移; 温度变化所产生的热固结沉降是影响桩身侧摩阻力的主要原因; 由升温导致的土体黏聚力和内摩擦角的下降对桩身侧摩阻力变化影响较小. |
| Abstract: | Energy piles have attracted wide attention in the construction field with good energy saving and emission reduction effect. However, the heat exchange of energy pile in soft soil site will cause obvious thermal consolidation settlement of soil around the pile, thus affecting the load transfer law and the bearing characteristics of pile-soil. The one-dimensional consolidation theory considering temperature effect is used to calculate the thermal consolidation settlement of the soil around the pile at arbitrary times, and the load transfer model of the energy pile considering temperature effect of the soil around the pile is established by exploiting Zottenwu’s negative friction formula. The case study shows that the temperature rise of soil around the pile leads to the increase of negative friction resistance and axial force of the pile body, and the position of the neutral point moves downward. The change of soil compression properties caused by temperature rise is the main reason affecting the lateral friction resistance of the pile, while the decrease of soil cohesion and internal friction angle caused by temperature rise has little effect on the lateral friction resistance of the pile. |
| 参考文献 /References: | [1] 刘汉龙, 孔纲强, 吴宏伟. 能量桩工程应用研究进展及PCC能量桩技术开发[J]. 岩土工程学报, 2014, 36(1): 176-181. [2] Abdelaziz S L, Olgun C G, Martin J R II. Counterbalancing ambient interference on thermal conductivity tests for energy piles[J]. Geothermics, 2015, 56:45-59. [3] 崔宏志, 邹金平, 包小华, 等. 制冷工况相变能源桩热交换规律[J]. 清华大学学报(自然科学版), 2020, 60(9): 715-725. [4] 桂树强, 程晓辉, 张志鹏. 地源热泵桩基与钻孔埋管换热器换热性能比较[J]. 土木建筑与环境工程, 2013, 35(3):151-156. [5] Knellwolf C, Peron H, Laloui L. Geotechnical analysis of heat exchanger piles[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2011, 137(10):890-902. [6] 黄胤培, 蒋刚, 路宏伟, 等. 基于指数模型的能源桩 热-力耦合荷载传递法[J]. 南京工业大学学报(自然科学版), 2019, 41(1):96-103. [7] 宗宸锋, 邵东, 黄胤培, 等. 考虑径向温度效应的能源桩荷载传递分析方法研究[J]. 防灾减灾工程学报, 2019, 39(4):658-664. [8] 董龙龙, 吴文兵, 梁荣柱, 等. 基于指数模型的能源桩长期响应研究[J]. 岩石力学与工程学报, 2021, 40(3): 629-639. [9] 张阳, 尹铁锋, 范高飞, 等. 考虑热交换作用的桩基承载力特性研究[J]. 水利与建筑工程学报, 2017, 15(3): 203-208. [10] Akrouch G A, Sánchez M, Briaud J L. Thermo- mechanical behavior of energy piles in high plasticity clays[J]. Acta Geotechnica, 2014, 9(3):399-412. [11] 邓岳保, 王天园, 孔纲强. 考虑温度效应的饱和土地基固结理论[J]. 岩土工程学报, 2019, 41(10):1827-1835. [12] 钱峰, 刘干斌, 汤炀, 等. 循环温度和荷载作用下能源桩-土力学特性研究[J]. 建筑结构, 2020, 50(7):136-142. [13] 赵明华, 贺炜, 曹文贵. 基桩负摩阻力计算方法初探[J]. 岩土力学, 2004, 25(9):1442-1446. [14] Cekerevac C, Laloui L. Experimental study of thermal effects on the mechanical behaviour of a clay[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2004, 28(3):209-228. [15] Laloui L, Cekerevac C. Thermo-plasticity of clays: An isotropic yield mechanism[J]. Computers and Geotechnics, 2003, 30(8):649-660. [16] JGJ 94-2008. 建筑桩基技术规范[S]. [17] Vijayvergiya V N. Load-movement characteristics of piles[J]. Coastal and Ocean Division ASCE, 1977(2): 269-284. [18] 梅国雄, 宰金珉. 固结有限层理论与应用[M]. 北京: 科学出版社, 2006. [19] 童森杰, 邓岳保, 陈菲, 等. 考虑温度效应的能源桩沉降特性研究[J]. 建筑结构, 2018, 48(21):119-123. [20] 周国林. 单桩负摩阻力随时间发展的传递函数[J]. 岩土力学, 1992(13):99-105. |
| 备注/Memo: | 收稿日期:2021-02-23.宁波大学学报（理工版）网址:http://journallg.nbu.edu.cn/ 基金项目:浙江省基础公益研究计划（LGG21E080005）;宁波市自然科学基金（2019A610398）. 第一作者:俞磊（1997－）,男,浙江宁波人,在读硕士研究生,主要研究方向:能源桩.E-mail:121501192@qq.com *通信作者:邓岳保（1983－）,男,湖南岳阳人,博士/副教授,主要研究方向:软土地基处理.E-mail:dengyuebao@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
