Abstract:

The influence of the crown settlement, horizontal convergence and structure stress on the safety of the tunnel structures is analyzed, which indicates that it is reasonable to take the crown settlement as the construction monitoring control criteria for large spanned subsea tunnels constructed by CRD method. A study is made on the construction monitoring control criteria of Xiamen Xiang’an subsea tunnel constructed by CRD method with the heading excavation sequence being in the order of 1324 and crown settlement control criteria and crown settlement rate control criteria are proposed. The research results have provided basis for the informationaided construction and insitu displacement control of Xiamen Xiang’an subsea tunnel and other similar works in the future.