To investigate the pattern of soil deformation around high-pressure jet grouted piles when they are installed in close proximity to an existing high-speed railway,this study focused on the cross-section where Pier No.198 of Hangzhou-Ningbo High-speed Railway is located.Combining field tests with numerical simulations using the finite difference software FLAC3D,it examined the influence of grouting pressure,pile length,and soil modulus on the extent of soil displacement effects caused by a single high-pressure jet grouting pile.Findings reveal that:(1)In field tests,the soil displacement effect induced by single pile extended up to approximately 16.5 m,accounting for 82.5%of the pile length.(2)There exists a positive correlation between the extent of soil displacement effects induced by a single high-pressure jet grouted pile and both grouting pressure and pile length.(3)As the grouting pressure increases and the pile length grows,the affected distance of the soil displacement effect expands.(4)An increase in the modulus of soil surrounding the pile leads to a decrease in the extent of the soil displacement effect associated with high-pressure jet grouting.(5)During the construction of high-pressure jet grouted piles in close proximity to existing high-speed railways,it is essential to establish appropriate construction parameters and conduct deformation monitoring,implementing deformation control measures if necessary.
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