Study on Combined Support Technology of Horizontal Jet Grouting Pile and Advanced Small Conduit for Water Conveyance Tunnel in Water-rich Residual Soil
To investigate the influence of the design parameters of horizontal jet grouting pile cooperating with advanced small conduit combined support on the pre-reinforcement effect of water conveyance tunnel in poor geological conditions,based on the water-rich residual soil water conveyance tunnel of the Huangzhang Reservoir in Guangxi Zhuang Autonomous Region,the influence of the diameter of the advanced small conduit,the thickness of the grouting reinforcement ring,the external angle,the circumferential spacing,the diameter of the horizontal jet grouting pile and the pile spacing on the vertical settlement of the vault,the horizontal deformation of the arch waist and the deformation of the tunnel face of the water conveyance tunnel in the water-rich residual soil strata are studied,and the sensitivity of the support parameters is studied by the local sensitivity analysis method.The results show that the vertical settlement of the vault in the tunnel,the horizontal convergence of the arch waist,and the displacement of the tunnel face are related to the relevant parameters of the advanced small conduit and the horizontal jet grouting pile.The extrapolation angle of the small conduit has the greatest influence on the vertical settlement of the vault,followed by the thickness of the grouting reinforcement ring,and the circumferential spacing of the small conduit has the least influence.The thickness of the small conduit grouting reinforcement ring has the greatest influence on the horizontal displacement of the arch waist,followed by the small conduit extrapolation angle,and the small conduit diameter has the least influence.When using the combined support of advanced small conduit+horizontal jet grouting pile to support the water-rich residual soil water conveyance tunnel,the influence of various parameters should be comprehensively considered to seek the safest and most economical support parameters to ensure the safety of tunnel construction.
water conveyance tunnelwater-rich residual soilsupportsadvanced small conduithorizontal jet grouting piledesign parameters
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NSTL
万方数据
维普
