With the decline of the stability of surrounding rock, the ground subsidence and the vault settlement increase gradually.
随着围岩稳定性由好变坏，地表沉降和拱顶下沉值也呈逐渐增大的趋势；
So far, there is no method by which the stability of the surrounding ground can be effectively evaluated.
目前，还没有一套评价岩体工程稳定性的行之有效的方法。
Ground surface settlement is an important factor to evaluate surrounding rock stability of shallow tunnel.
地表沉降是判断浅埋隧道地层稳定的一个重要指标。
Ground surface settlement is an important factor to evaluate surrounding rock stability of shallow tunnel.
地表沉降是判断浅埋隧道地层稳定的一个重要指标。
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