砂土场地中直埋热力管道热力学特性试验研究

为研究砂土场地中管道温度变化影响下管体与土体的热力学特性, 设计了一种直埋热力管道温度变化模型试验及测试系统, 较为系统地研究了砂土场地中直埋热力管道运行时的管土热力学特性. 结果表明: 在管道升温过程中, 管道上部土体温度增长速率和幅度均大于管道侧边及底部土体温度; 土体孔压随温度上升而增大, 在温度稳定后逐渐消散; 管体应变在温度上升时因膨胀而变大, 随后回落, 并维持在一定值, 其中环向应变大于轴向应变.

Experimental study on thermodynamic characteristics of directly buried heat pipes under sand foundation

In order to study the thermodynamic characteristics of pipe body and soil under the influence of pipe temperature change in sand foundation, a model test and test system with temperature variation of direct buried heat pipe are designed. The thermodynamic properties of the pipe soil is systemically investigated and analyzed. The results show the following findings: During the heating process of the pipeline, the temperature growth rate and magnitude of the soil above the pipeline are greater than the temperature of the soil at the side and bottom of the pipeline. The pore pressure of the soil increases with temperature and gradually dissipates after the temperature stabilizes. The strain of the pipe body grows larger due to expansion when the temperature rises, and then falls back and maintains a certain value, wherein the hoop strain is greater than the axial strain.