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采用裂缝计对忠武管道张家沟段危岩裂缝进行了近3 a的相对位移监测,变形曲线经历了收缩-扩张的“类正弦”变化过程。由相关性分析可知,裂缝相对位移实测值与同期温度呈明显负相关性,因此可以推断温度是引起实测曲线呈年周期性变化的主要原因,且裂缝相对位移变化滞后温度变化3~12 h。根据这一特点,采用线性回归分析方法消除了由温度引起的岩体线弹性假象位移,反映了危岩裂缝变形的真实状态。
The fractures of dangerous rocks in Zhangjiagou section of Zhongwu Pipeline were monitored with a crack gauge for nearly 3 years. The deformation curves underwent the process of shrinkage-expansion and sine-like transformation. Correlation analysis shows that the measured value of the relative displacement of the fractures is significantly negatively correlated with the temperature of the same period. Therefore, it can be inferred that the temperature is the main cause of the annual variation of the measured curve, and the change of the relative displacement of the fractures changes by 3 to 12 h. According to this feature, linear regression analysis method is used to eliminate the elastic displacement caused by temperature and reflect the true state of the deformation of the rock.