不同埋深下埋地管道温度应力分析
Temperature Stress Analysis of Buried Pipelines under Different Burial Depths

管道埋深不同时，管道周围土体温度不同，进而导致管道内温度应力不同，管道埋深对埋地管道的安全性至关重要。为了研究不同埋深下管道温度场和管道温度应力的变化规律，采用现场实验与ANSYS软件模拟相结合的研究方法，对现场实验和软件模拟确定的管道周围土体温度值和应力值进行对比分析，验证有限元模拟的可行性。并进一步通过有限元数值模拟研究不同埋深下8月份和1月份时管道内温度场和温度应力的变化规律，研究结果表明：管道周围土体温度表现出冬暖夏凉的变化规律。管道周围土体温度高时，管道内产生压应力，管道周围土体温度低时，管道内产生拉应力。随着管道埋深的不断增大，管道环向应力和轴向应力逐渐减小。
The different burial depths of pipelines result in different soil temperatures around the pipelines, leading to different temperature stresses inside the pipelines. The burial depth of pipelines is crucial for the safety of buried pipelines. In order to study the temperature field and temperature stress changes of pipelines under different burial depths, a research method combining on-site experiments and ANSYS software simulation was adopted to compare and analyze the temperature and stress values of the soil around the pipeline determined by on-site experiments and software simulation, and to verify the feasibility of finite element simulation. Furthermore, through finite element numerical simulation, the temperature field and temperature stress inside the pipeline were studied under different burial depths in August and January. The research results showed that the temperature of the soil around the pipeline exhibited a variation pattern of warm in winter and cool in summer. When the temperature of the soil around the pipeline is high, compressive stress is generated inside the pipeline. When the temperature of the soil around the pipeline is low, tensile stress is generated inside the pipeline. As the burial depth of the pipeline increases, the circumferential and axial stresses of the pipeline gradually decrease.