高温冻土区XPS保温板路基的冻土上限计算模型（英文）
发布时间：2018-10-12 17:39
【摘要】：为揭示青藏高原东部高温冻土区高速公路XPS保温板路基的人为冻土上限退化规律,确保高温冻土区路基的长期热稳定性,减小因人为冻土上限退化引起的路基病害,首先,利用现场地温实测资料分析高温冻土区XPS保温板路基地温的纵、横向分布特征,以及路基修筑初期人为冻土上限的退化特征;然后,采用非饱和土渗流与热传导理论求解冻土水热耦合微分方程,实现冻土水分场与温度场的全耦合,进而将水热耦合模型模拟所得温度场与现场实测温度场进行比较,以验证该模型的正确性;并分析XPS保温板路基在5种工况(包括填料类型、年平均地温、路基高度、XPS保温板铺设位置和气候变暖)下人为冻土上限的退化规律;最后,采用MATLAB分析影响人为冻土上限退化主要因素,进而对其进行多元线性回归,建立高温冻土区XPS保温板路基人为冻土上限计算模型。研究结果表明:XPS保温板路基左侧一定范围内温度比右侧对应范围的温度高;路基修筑初期人为冻土上限先抬升60cm,然后以10cm/年下降,冻土上限的变化导致深部冻土层存在一定幅度的升温;5种工况条件下,路基人为冻土上限与时间均呈线性增加关系;影响人为冻土上限退化的2个主要影响因素为填料类型和气候变暖;该模型可为今后开展高温冻土区高速公路XPS保温板路基长期变形预测与病害防治提供技术参考。
[Abstract]:In order to reveal the upper limit degradation law of XPS thermal insulation board subgrade of expressway in the eastern Qinghai-Tibet Plateau, to ensure the long-term thermal stability of the roadbed in the high-temperature frozen soil region and to reduce the roadbed disease caused by the upper limit degradation of man-made permafrost, first of all, The vertical and transverse distribution characteristics of the ground temperature of XPS thermal insulation board subgrade in high temperature frozen soil region and the degradation characteristics of the upper limit of artificial frozen soil in the early period of roadbed construction are analyzed by using the measured data of field ground temperature. The unsaturated soil seepage and heat conduction theory is used to solve the coupled differential equation of permafrost water field and temperature field, and then the temperature field simulated by the coupled model is compared with the field measured temperature field. In order to verify the correctness of the model, and analyze the degradation law of the upper limit of artificial frozen soil under five working conditions (including packing type, annual average ground temperature, roadbed height, XPS insulation board laying position and climate warming) of XPS insulation board roadbed. The main factors affecting the upper limit degradation of permafrost were analyzed by MATLAB, and then multivariate linear regression was carried out to establish the upper limit calculation model of artificial frozen soil for XPS thermal insulation board roadbed in high temperature frozen soil region. The results show that the temperature of the left side of the XPS insulation board roadbed is higher than that of the corresponding range of the right side, and the upper limit of artificial frozen soil is raised first by 60 cm at the beginning of the subgrade construction, and then by the annual decrease of the 10cm/. The change of the upper limit of frozen soil leads to a certain extent of temperature rise in deep frozen soil, and the upper limit of artificial permafrost of roadbed increases linearly with time under five working conditions. The two main factors affecting the upper limit degradation of permafrost are packing type and climate warming, and this model can provide technical reference for long-term deformation prediction and disease prevention of XPS insulation board roadbed in high temperature frozen soil region.
【作者单位】： 北京交通大学土木建筑工程学院;青海省交通科学研究院多年冻土地区公路建设与养护技术交通行业重点实验室;
【基金】：supported by the National Natural Science Foundation of China (No.41271072and 51378057) Science and Technology Project of Qinghai Province(No.2013-J-770) Science and Technology Project of Shenshuo Railway Branch(No.2015-10)
【分类号】：U416.168
本文编号：2267017
[Abstract]:In order to reveal the upper limit degradation law of XPS thermal insulation board subgrade of expressway in the eastern Qinghai-Tibet Plateau, to ensure the long-term thermal stability of the roadbed in the high-temperature frozen soil region and to reduce the roadbed disease caused by the upper limit degradation of man-made permafrost, first of all, The vertical and transverse distribution characteristics of the ground temperature of XPS thermal insulation board subgrade in high temperature frozen soil region and the degradation characteristics of the upper limit of artificial frozen soil in the early period of roadbed construction are analyzed by using the measured data of field ground temperature. The unsaturated soil seepage and heat conduction theory is used to solve the coupled differential equation of permafrost water field and temperature field, and then the temperature field simulated by the coupled model is compared with the field measured temperature field. In order to verify the correctness of the model, and analyze the degradation law of the upper limit of artificial frozen soil under five working conditions (including packing type, annual average ground temperature, roadbed height, XPS insulation board laying position and climate warming) of XPS insulation board roadbed. The main factors affecting the upper limit degradation of permafrost were analyzed by MATLAB, and then multivariate linear regression was carried out to establish the upper limit calculation model of artificial frozen soil for XPS thermal insulation board roadbed in high temperature frozen soil region. The results show that the temperature of the left side of the XPS insulation board roadbed is higher than that of the corresponding range of the right side, and the upper limit of artificial frozen soil is raised first by 60 cm at the beginning of the subgrade construction, and then by the annual decrease of the 10cm/. The change of the upper limit of frozen soil leads to a certain extent of temperature rise in deep frozen soil, and the upper limit of artificial permafrost of roadbed increases linearly with time under five working conditions. The two main factors affecting the upper limit degradation of permafrost are packing type and climate warming, and this model can provide technical reference for long-term deformation prediction and disease prevention of XPS insulation board roadbed in high temperature frozen soil region.
【作者单位】： 北京交通大学土木建筑工程学院;青海省交通科学研究院多年冻土地区公路建设与养护技术交通行业重点实验室;
【基金】：supported by the National Natural Science Foundation of China (No.41271072and 51378057) Science and Technology Project of Qinghai Province(No.2013-J-770) Science and Technology Project of Shenshuo Railway Branch(No.2015-10)
【分类号】：U416.168
【相似文献】
相关期刊论文 前2条
1 路青虎;;青藏铁路沿线冻土上限变化规律分析[J];中国铁路;2011年05期
2 ;[J];;年期
，本文编号：2267017
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2267017.html
