摘要
为了研究多年冻土区地温分布及其演化规律,基于多年冻土工程路基地温现场监测资料,采用非线性分析方法对沿线多年冻土地温数据进行回归拟合,建立了不同地段的地温波动预测模型,并根据监测结果提出了保护冻土路基、缓减工程作用影响的设计原则和实施方案。研究结果表明:不同监测时段的冻土地温变化规律基本相同,在2～3.5m深度范围内,温度降幅较大;3.5m以下温差变化相对缓慢,在0℃线左右波动,并逐渐趋于稳定。采用提出的多年冻土地温预测模型进行地温—深度曲线预测效果良好。冻土路基设计应以保护冻土、控制融沉速率为基本原则,通过控制路基最小填土高度、设置隔温材料、完善地表水和路基内部排水设施等措施,减缓工程作用对冻土路基的不利影响。本文研究成果可为冻土路基地温预测、变形监测和降温措施制定提供参考。
In order to study the ground temperature distribution and its evolution in permafrost region, based on the on-site monitoring data of permafrost subgrade, employing nonlinear analysis method to fit and reconstruct the ground temperature data, the ground temperature fluctuation prediction model were established in different locations. The design principle and implementation plan are proposed to protect the frozen subgrade and mitigate the engineering impact based on the monitoring results. The results show that the variation law of ground temperature is basically the same in different monitoring periods, and the temperature decreases greatly in the depth of 2~3.5m;the temperature difference fluctuates slowly around 0 ℃ below 3.5m, and gradually becomes stable. In general, the proposed fitting prediction model of the permafrost ground temperature is effective to predict the ground temperature with depth. The principle of permafrost subgrade design is to protect the frozen ground and control the thawing settlement rate. In order to mitigate the adverse engineering impact on the permafrost subgrade ground, some measures are adopted, such as limiting the minimum filling height, setting temperature insulating material, improving the surface and ground water drainage facilities. The research results could provide a reference for the ground temperature prediction, deformation monitoring and cooling measures in permafrost subgrade.
作者
张迪
Zhang Di(Xinjiang Transportation Planning Surveying and Design Institute,Urumqi 830006,China)
出处
《工程勘察》
2019年第1期41-45,共5页
Geotechnical Investigation & Surveying
关键词
道路工程
预测模型
非线性拟合
冻土地温
road engineering
prediction model
nonlinear fitting
permafrost temperature
作者简介
张迪(1990-),男(汉族),新疆乌鲁木齐人,硕士,工程师.
