The water inflow along the circumferential surface of a tunnel is an important parameter in tunnel engineering.Previ-ous research did not consider the impact of excavation-induced damage on the seepage field,while tunnel construction can cause a certain degree of damage to surrounding rock.Therefore,this study took into account the influence of tunnel excavation-induced damage,and derived theoretical analytical solutions for two-dimensional seepage fields in tunnels under three different radial grouting conditions:no radial grouting,partial radial grouting,and full radial grouting.Subsequently,we explored the applicability of two commonly used equivalent circle methods in rectangular tunnels for analyzing theoretical solutions to tunnel seepage fields.Sensitivity analysis was conducted on the radial grouting parameters responding to tunnel circumferential water inflow and external lining water pressure.Finally,a comparison was made between the theoretical analytical solutions and numerical solutions for tun-nel seepage fields.The results indicated that the two-dimensional seepage calculation model for tunnels can effectively reflect the water inflow along the circumferential surface of the tunnel.Excavation-induced damage had a significant impact on the tunnel's circumferential water inflow,with the greatest effect before initial support construction and the least effect after secondary lining construction.When the relative permeability coefficient km/kg for radial grouting reached 100 and the relative thickness dg for ra-dial grouting reaches 1.0 times the tunnel's inner diameter r0,further increasing km/kgor dg/r0 will not significantly reduce the circumferential seepage flow rate Q and the outer water pressure p,but will only increase construction costs unnecessarily.The findings of this study can offer certain theoretical guidance for radial grouting design of tunnels situated in adverse geological stra-ta.
关键词
隧道二维渗流场/解析解/涌水量/等效周长法/等效面积法
Key words
two-dimensional seepage field of tunnels/analytical solution/water inflow/equivalent perimeter method/equiv-alent area method
维普
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