盾构隧洞双层衬砌接头相互作用模型

JOINT INTERACTION MODELS FOR SHIELD TUNNEL SEGMENT REINFORCED BY SECONDARY LININGS

简要介绍了双层衬砌接头荷载试验原理及结果。在此基础上,根据双层衬砌接合面结构处理方式的不同,提出了双层衬砌相互作用的三种模型;讨论了内衬混凝土受拉开裂后内衬刚度降低的模拟方法;并用试验结果对模型的合理性进行了验证。研究表明:用弹性铰单元来模拟混凝土开裂后构件刚度的降低是合理的,考虑混凝土开裂后内衬刚度降低的计算结果与试验结果更吻合。

The principle and results of load test on double-layer linging joint are discussed simply. Based on the above results, three joint interaction models are proposed according to the different structural forms of joint between the primary and the secondary linings. The lining fracture created by tensile force is simulated, and the calculational result is compared with the test data. It is shown that reducing the stiffness of lining in the case of occurrence of fracture is reasonable, and the model result is in good accordance with the test data.