There are few research achievements about deformation and damage mechanism for double-arch tunnel with thickness-changing curved middle-wall at home and aboard.

At present, there is a lack of construction technology research on the curved middle wall twin-arch tunnel.

Study on treatment schemes of an expressway multi-arch tunnel middle wall;

Analysis of influence of blasting vibration on middle wall of a double-arch tunnel;

The middle wall of a double-linked-arch tunnel is the key component of the structure;it also has a great influence on waterproof and drainage of the tunnel,so it is very important to select the proper form of the middle wall.

Focusing on the mid-partition,this paper presents the general rules of the applied force state undertaken by the twin-arched tunnel s mid-partition,which can be taken as a reference for the design and construction.

The two excavating procedures are simulated by finite element method on Jinzhulin tunnel to study the mechanics behaviour of the most important portion of double-arched tunnel,the mid-partition.

According to the Xiaojinkou twin-bore connection arch tunnel project of the Guanghui(Guangzhou-Huizhou) highway by the data of the measuring section 1-1 in the type II surrounding rock, the mechanical characteristics of the middle-wall in the twin-bore connecting arch tunnel have been deeply analyzed.

Considering the special condition of the six lanes large-span multi-arch tunnel in the Wanping Expressway,and choosing some representative cross-sections of Wujiazhuang Tunnel,their inner middle-wall s internal forces of the three-layer vertical middle-wall are monitored during the construction.

Three-dimensional mechanical effect analysis of two types of midboard for double span-arch-connecting tunnel;