In this article, the mechanical property of superstratum of long subsea tunnel is analysed. Considering the autologous stability of stra-turns of rock cavity after the undersea tunnel is tunneled, the stratums cut across by the long subsea tunnel is looked as tabular stratums on the condition of deep sea water' s vertical action. Based on the theoretical of shearing stress of scleroid stratum, the reasonable depth of embedment of long subsea tunnel is confirmed, which has positive significance for the stress demand, security demand and economic demand of the structural design.%通过对长大海底隧道上覆地层力学性能分析,从海底隧道开挖后毛洞的自稳性角度出发,在无侧向作用的深海水层竖向作用下将海底隧道硬质穿越层考虑为板状岩层,按硬质岩层的抗剪应力理论确定了长大海底隧道的合理埋置深度,对结构设计的受力要求,安全要求和经济要求方面都有其积极的意义。
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