The Construction Technology Of The Jingfu Highway Bi-Arch Tunnel With Soft Surrounding Rock

The bi-arch tunnel which is a new large span tunnel is presented with the rapid development of high way building in our country. Its route is fluent and impropriating the area is small and the ratio of utilizing space is high. It is easy to connect the out road with avoiding the embankment in the tunnel exit or the bridge framing. It has the advantages of adapting the condition and protecting the environment and engineering quantitatively.The wenshan tunnel of Jing-Fu highway targeted in this paper, the method of entering hole, the construction sequence and the pay to protect the measure of the II and III soft surrounding rock, shallow cover up, be partial to press and inclined hand over bi-arch tunnel were mainly introduced.The development and present condition of study of the t bi-arch tunnel was mention in this paper, the method of supposing door which is the new into hole method of the bi-arch tunnel was mention. This paper studied the affect of surrounding rock load and press partial when the right and left hole construction sequence of bi-arch tunnel in press partial district, at the same time discussed the spot construction supervision measurement technique.Through theories analysis and practice, we think the protect measure and dig method which is applicable to bi-arch tunnel is variety, we must confirm them by the Geology condition of construction place and construction level. Practice has proved, under the engineering environment of wenshan tunnel, Strengthen the spot supervision measurement, adopt the method of supposing door, construction in left door where overlay is thin before in right door, under these measures, the construction of the soft surrounding rock press partial and inclined hand over bi-arch tunnel obtain the success.