长输埋地油气管线在严重的地灾作用下会引发管道变形，如果变形的管段存在缺陷，将极易导致管道失效，造成严重的环境污染和经济损失。准确地获取管道的变形情况并进行安全评价能够为保障管道安全稳定运行发挥重要的作用。基于IMU检测数据，通过小波变换降噪和油气管道设计规范进行特征识别的应变解析算法，能够有效地识别管线上的热偎弯管、冷弯管、弹性敷设段和重点关注段。该算法计算的管段弯曲拉伸应变值将结合ExxonMobil提出的拉伸应变容量预测模型对环焊缝进行基于应变的安全评价。在基于应变设计的高钢级油气管道已在国内油气运输行业得到广泛应用的背景下，可以参考该评价方法开展高钢级管道环焊缝的安全评价。

In serious geological disasters, long-distance buried oil and gas pipelines usually suffers large deformation. If the deformed pipe has a defect, it will easily lead to pipeline body failure, and finally serious environmental pollution and economic loss. Accurately obtaining the deformation of pipelines and conducting safety assessment can play an important role in ensuring the safe and stable operation of pipelines. Based on the inertial measurement unit (IMU) data, the strain analysis algorithm adopted wavelet transform to reduce noise and design codes to recognize feature, which could effectively identify hot bends, cold bends, pipe laying with elastic bending, and key attention sections on pipelines. In order to conduct strain-based safety assessment of the girth weld, the calculated bending tensile strain value of the pipe section was combined with the tensile strain capacity prediction model proposed by ExxonMobil. In the background of high-grade oil and gas pipeline based on strain design had been widely used in domestic oil and gas transportation industry, pipeline safety assessment of girth weld in high-grade steel pipelines can be carried out by adopting the method of this paper.