When circumjacent load makes the lowest natural frequency zero, critical load is obtained.
当周边面力使夹层圆板的最低固有频率为零时，就可获得临界载荷的值。
Face stability is key point of tunnel shields excavation, Which influenced circumjacent environment.
开挖面的稳定是盾构施工技术的关键问题，直接影响到周边环境。
Circumjacent environment is good, traffic is convenient, fashionable and luxurious elevator building.
周围环境杰出，交通很便利，时尚豪华的电梯洋楼。
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