Abstract
Based on the Yingxiongshan tunnel project in Jinan, a numerical calculation model of tunnel excavation considering the surface grouting reinforcement effect of soil-rock composite stratum is established, and the effects of elastic modulus and grouting width of grouting reinforcement zone on tunnel stability are studied. and the research results are applied to the supporting project to verify the rationality of the numerical calculation results. The results show that grouting reinforcement can effectively control the deformation of surrounding rock and supporting structure, and the absolute value of surface settlement is negatively correlated with grouting width and elastic modulus. The surface settlement value is not sensitive to the change of the width of grouting reinforcement zone, but is sensitive to the change of elastic modulus.
Highlights
The improving effect of grouting reinforcement on the mechanical properties of rock and soil mass hasWhen a tunnel passes through soft soil layer or soft rock stratum, this will greatly aggravate the construction difficulty and affect the construction schedule, especially large section and small clear distance tunnels are prone to been rarely considered
The influences of elasticity modulus and grouting reinforcement width in the grouting reinforcement zone on the tunnel stability were analyzed via numerical simulation
The grouting reinforcement zone was simulated using ZONE units, the grouting effect was realized by increasing the parameter values of surrounding rock within the grouting scope, and under normal circumstances, the elasticity modulus could be elevated to 1.25 and 1.56 times of the original value, while the cohesion to 10 to 55 times of the original cohesion [10]
Summary
The improving effect of grouting reinforcement on the mechanical properties of rock and soil mass has. When it comes to the grouting reinforcement process, Liu S J [2], Zhang X F [3], Wei C L [4] and Wang S [5] et al. The tunnel surrounding rocks, whose grade is V, are loose and broken, there are mostly quaternary soil layer, single-liquid and double-liquid grouting reinforcement macadam, etc. Lai H P [8] et al analyzed the treatment effects of through cohesive soil, macadam, cementing gravel, and single-liquid grouting and double-liquid grouting. The limestone, the surrounding rocks have no self-stabilizing abovementioned studies are of great significance for ability, the geological conditions of left and right lines improving the surface grouting reinforcement technology.
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