This paper also presents a method to solve the tunnel axis displacement on line caused by angle error between tube center axis and datum of joint.

分析了对接面与管段中心线夹角误差对沉放后线路位置的影响，提出了控制隧道轴线偏差的措施；

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Whereas, the joint angle method, which can improve the Q-statistic plots method, is used to isolate the fault source on line employing the history fault knowledge.

联合角度法改进了传统的贡献图的诊断方法，通过对故障库中的故障知识的利用，能够在线的分离出发生故障的传感器。

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