A Study on the Interaction between Ground and Lining around the Tunnel Face

(1)地面与隧道支护的相互作用对隧道的稳定至关重要。(2)路基反力作用使得隧道衬砌拱弯矩较小。(3)即使是较薄的衬砌，在不发生屈曲的情况下，也能对周围地面起到支撑作用。(4)衬砌越厚，由于弯矩作用，衬砌越容易发生弯曲破坏。(5)即使混凝土衬砌因弯矩破坏，只要在一定程度上预期地面反力，衬砌整体结构仍能保持稳定。这些结果是通过假设一个简单的隧道力学模型而不考虑施工过程而得出的。需要从更实际的方法和实验室测试的角度来完善上述陈述。

(1) The interaction between the ground and the tunnel support is essential for the stability of the tunnel.(2) The subgrade reaction makes the bending moment of the tunnel lining arch small.(3) Even the thinner lining is able to supprt the surrounding ground if no buckling occurs.(4) The thicker lining is more likely to show the bending failure due to the bending moment.(5) Even if the concrete lining breaks due to the bending moment, the whole structure of lining can keep stability as long as the ground reaction is expected to some extent.These results were extracted by assuming a simple mechanical model of tunnelling without any consideration of the construction process. It is required to refine the above statements from the view points of more practical methods as well as the laboratory testing.