开挖过程中桩顶出现沿隧道推进方向的往复位移；
During tunneling, there are back and forth displacements at pile top along the direction in which the tunnel is pushed forward.
由于这种新型传感器可以沿导轨在水平方向上往复位移，所以在被测薄膜的幅宽方向上可以实现多点巡回检测。
This new-style sensor can move to-and -fro along the horizontal direction. Thus it can actualize the multi-point, itinerant measure of film along the direction of breadth.
而合适的复位弹簧刚度可以在不显著减小隔震效果的情况下有效地控制滑移位移。
The sliding displacement can be controlled by the right stiffness of spring under the circumstance that the effect of isolation doesn't decrease too much.
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