Analysis of Seepage Problems in Three-hole Parallel Subsea Tunnels Considering the Influence Between Tunnels
The analysis of seepage fields in subsea tunnels is a fundamental issue in tunnel construc-tion,which is closely related to the stability of the tunnel surrounding rock and the layout of engineering waterproofing and drainage facilities.Considering actual engineering conditions,subsea tunnels often use the three-hole parallel method of"main tunnel + service tunnel"to cross the strait.Taking practical engineering as the background,a seepage calculation model for a three-hole parallel subsea tunnel with different overburden thicknesses was established.The seepage characteristics of the tunnel were ana-lyzed from the aspects of water inflow,pore water pressure,seepage velocity,and grouting parameters.The conclusions drawn are as follows:When tunnels are close to each other,there will be mutual inter-ference in the seepage fields.Whether using the tunnel water inflow calculation formula given in the current specifications or the precise analytical solution formula to predict the water inflow of the main tunnel of a three-hole parallel subsea tunnel,there will be significant errors,which will overestimate the tunnel water inflow with a maximum error of 40%;The three-hole tunnels act as"pressure relief holes"for each other,reducing the pore water pressure and seepage velocity around the main tunnel.As a cru-cial method for tunnel water blocking,grouting should not only take into account the thickness of the grouting ring but also prioritize the compaction of the grout.
subsea tunnelsthree parallel holeswater inflowpore water pressureseepage veloci-tygrouting parameters
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