Evaluation of stability of Wushaoling multi-tunnel under earthquake loading
Wushaoling tunnel is comprised of two parallel separate tunnels. During the construction in the Fault Zone No.7, which has complex geological conditions, excessive deformations occurred. In order to speed up the construction, another two advancing drifts were made to go through the collapsed regions and parallel to the two main tunnels. So there ever existed four tunnels within the fault zone. Moreover, It is shown from the regional seismic data that the Fault Zone No.7 is in an active seismic zone. In order to ensure the safety, it is necessary to evaluate the influence of the earthquake loading on the tunnel structures. The actual earthquake responses were investigated using the commercial software of FLAC for the cases of four tunnels and only two main tunnels. Based on the calculated results, the stress distribution of the surrounding rock, the contact pressure between the shotcrete and reinforced concrete lining, and the stresses induced in the lining under two different conditions were discussed. It is concluded that the presence of two drifts has a great influence on the safety of the two main tunnels, and suggested that the two drifts should be backfilled before the Wushaoling tunnel was put into use.
L.Yan, J.S.Yang, S.J.Deng, B.C.Liu J.S.Yang S.J.Deng B.C.Liu
School of Civil Engineering and Architecture, Central South University, Hunan, China Guizhou communication planning and prospecting design academy, Guizhou, China
国际会议
上海
英文
2007-10-18（万方平台首次上网日期，不代表论文的发表时间）