多年冻土区桥梁工程桩基础服役期温度场研究
发布时间：2019-05-23 06:57
【摘要】：选取青藏高原国道214沿线低温基本稳定区查拉坪旱桥桩基和高温不稳定区花石峡试验场桩基,对其运行期内地温进行连续监测。基于现场地温实测数据,从冻土上限、冻结及融化过程3个方面,分析桩基对冻土地温的影响,显示因桩基良好的导热性能加剧了桩周冻土与大气的热交换,桩周地温年较差明显增大。结合勘察设计资料建立数学模型,应用有限元数值模拟方法就桩基对地温场的长期影响进行预测,结果表明,未来50 a气温上升2℃的情况下,桩侧冻土上限与天然上限差异有所增大,桩侧多年冻土温度升高,该现象在高温不稳定冻土区表现得更为明显。所得结论可为多年冻土区桩基设计、降温保护措施采取及运行管理措施实施提供参考。
[Abstract]:The pile foundation of Zhalaping dry bridge in the low temperature basic stable area along the national highway 214 of Qinghai-Tibet Plateau and the pile foundation of Huashixia test site in high temperature unstable area were selected to continuously monitor the inland temperature during its operation period. Based on the measured data of ground temperature in situ, the influence of pile foundation on ground temperature of frozen soil is analyzed from three aspects: upper limit of frozen soil, freezing and melting process. It is shown that the heat exchange between frozen soil and atmosphere around pile is aggravated by the good thermal conductivity of pile foundation. The annual difference of ground temperature around the pile increases obviously. Based on the survey and design data, the mathematical model is established, and the long-term influence of pile foundation on the ground temperature field is predicted by finite element numerical simulation method. The results show that when the temperature increases by 2 鈩，
本文编号：2483695
[Abstract]:The pile foundation of Zhalaping dry bridge in the low temperature basic stable area along the national highway 214 of Qinghai-Tibet Plateau and the pile foundation of Huashixia test site in high temperature unstable area were selected to continuously monitor the inland temperature during its operation period. Based on the measured data of ground temperature in situ, the influence of pile foundation on ground temperature of frozen soil is analyzed from three aspects: upper limit of frozen soil, freezing and melting process. It is shown that the heat exchange between frozen soil and atmosphere around pile is aggravated by the good thermal conductivity of pile foundation. The annual difference of ground temperature around the pile increases obviously. Based on the survey and design data, the mathematical model is established, and the long-term influence of pile foundation on the ground temperature field is predicted by finite element numerical simulation method. The results show that when the temperature increases by 2 鈩，
本文编号：2483695
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2483695.html
