Optimization of Excavation Step Sequence of Double Side Slope Method in Super Section Tunnel
Journal Title: 河南科技大学学报（自然科学版） - Year 2017, Vol 38, Issue 4
Abstract
The tunnel of mark No. 3 of line No. 5 of Chongqing metro is a shallow buried flat tunnel with super section in water-rich stratum which was constructed by symmetrical excavation step sequence of double side slope method by 9 steps. Three-dimensional finite element model of the tunnel was established by MIDAS-GTS software. The ground surface settlement, the deformation of surrounding rock, and the support structure force were calculated under three different excavation step sequences. The analysis data were compared with the site monitoring data. The results show that force area is larger in arch crown. Surrounding rock stress and sprayed concrete support stress are larger in arch crown. The stability of arch crown is lower. There is stress concentration in the root of side wall. The tunnel structure is more sensitive to lateral deformation in construction stage. The horizontal convergence value curves in arch foot of the three kinds of excavation step change with construction step sequence. The value curves of horizontal convergence and vault settlement change suddenly when the core soil is removed. The frequency of monitoring should be increased in this phase.Three kinds of construction steps sequence were simulated including symmetrical excavation step sequence. A reasonable construction step sequence of the large span flat tunnel is proposed under this engineering geological conditions.
Authors and Affiliations
Chong ZOU, Xingliang JIN, Xiaojuan GAO, Xibo HU, Bin LIANG
Keywords
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