Research on Mechanical Characteristics of Tunnel Excavation in Water-rich Broken Surrounding Rock Considering Fluid-solid Coupling Effect
In order to study the mechanical characteristics of surrounding rock and lining structure under fluid-solid coupling during tunnel excavation in water-rich broken surrounding rock,taking Class Ⅳ water-rich broken surrounding rock section of Tianxiushan Tunnel as an example,this paper explores the influence of fluid-solid coupling effect in surrounding rock on pore pressure,plastic zone distribution and lining deformation in the surrounding rock of the tunnel during dynamic excavation of tunnel,and analyzes the reinforcement effect of grouting hollow anchor bolt.The results indicate that:(1)During tunnel excavation in broken surrounding rock with surface water infiltration,the"blocking"effect of lining on seepage increases the pore pressure in the upper surrounding rock of the arch waist;the fluid-solid coupling increases the settlement of the arch crown and the horizontal deformation at the arch shoulder,arch waist and arch foot,and expands the plastic zone range in the surrounding rock of the tunnel.(2)During the design and construction,the pore water pressure in the surrounding rock of the tunnel shall be considered as dynamic water pressure.(3)After the radial grouting hollow anchor bolt is adopted for the water-rich broken surrounding rock,the plastic zone range in the surrounding rock above the arch foot decreases,and the axial force and bending moment of the lining structure decrease.The study results provide a theoretical reference for the design and construction of tunnels in water-rich broken weak surrounding rocks.
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