Linear engineering across cold regions has a negative effect on the stability of underlying permafrost. The permafrost degradation affected by engineering activities would induce ground thaw settlement; hence, the feedback from ground alternation would damage the engineering structure conversely, which is detrimental to both engineering safety and the surrounding environment there, especially differential thaw settlement in patchy permafrost. To detect the engineering influence of gas pipeline on permafrost environment, a series of field monitoring was conducted and a numerical model considering the phase changing was introduced to simulate the thermal dynamic of underlying frozen soil and estimate the effect of several countermeasures chosen to alleviate the thermal disturbance from the pipeline. The results show that frozen soil was unstable and easy to degrade because of thermal disturbance from the pipeline—the active layer thickness is 1.5~2.0 m while the maximum thawing depth under the pipe goes over 7.0 m. Both cooling gas temperature and applying insulation layer would alleviate the permafrost degradation, but in different degrees of effect. The former did not have a significant alleviation for permafrost degrading, especially in the short term, while the latter was more effective during the whole life.

寒冷地区的线性工程对基础冻土的稳定性有负面影响。受工程活动影响的多年冻土退化将引起地面融化；因此，地面交替产生的反馈反过来会破坏工程结构，这既不利于工程安全，又不利于周围的环境，尤其是在斑片状多年冻土中融化的差异。为了检测天然气管道对多年冻土环境的工程影响，进行了一系列现场监测，并引入了考虑相变的数值模型，以模拟下层冻土的热力学，并评估了几种缓解热效应的对策的效果。来自管道的干扰。结果表明，由于管道的热扰动，冻土不稳定，易降解，有效层厚度为1.5〜2.0 m，最大解冻深度超过7.0 m。冷却气体温度和施加绝缘层都将减轻永久冻土的退化，但是效果不同。前者对永久冻土的降解没有明显的缓解作用，特别是在短期内，而后者在整个生命周期中更为有效。