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盾构隧道施工过程中管片衬砌由于受力复杂,容易发生局部破损的情况。文章依托深圳城市轨道交通5号线区间隧道盾构施工,在现场基于测试方法研究了管片衬砌在施工中的力学行为,对比探讨了隧道下穿软硬不均地层、粘土地层和上覆建筑物的全风化花岗岩层中衬砌所承受的轴力和弯矩。研究结果表明:不同地层中盾构隧道的力学性能有较大差异,但是它们的力学性能变化阶段是一致的。即:当管片刚拼装完成时,在盾壳的保护下,内力较小;管片内力在管片脱出盾尾后达到最大峰值;当管片拼装上一定时期后,管片内力趋于稳定,其内力一般较管片刚脱出盾尾时要小。
In the process of shield tunneling, the lining of the pipe lining is prone to partial damage due to the complicated forces. Based on the tunnel shield construction of Shenzhen urban rail transit line 5, the mechanical behavior of the segment lining in construction was studied based on the test method in the field. The comparison between the tunnel under the hard and soft strata, the clay strata and the overlying building All weathering granite layer of lining the axial force and bending moment. The results show that the mechanical properties of shield tunnels in different strata are quite different, but their changing stages of mechanical properties are consistent. That is, when the segment is assembled, the inner force is smaller under the protection of the shield; the internal force of the segment reaches the maximum peak after the segment emerges from the shield tail; when the segment is assembled for a certain period of time, the internal force of the segment tends to be stable , Its internal force is generally more than the tube out of the shield when the tail is smaller.