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Abstract Abstract：Research purposes：
During the rebuilding lane close to existing railway, restricted by the driving interference and limitations of construction site and catenary headroom, reinforcement of soft ground is a difficult problem. Therefore, it needs a rational technology which can not only able to meet the limited space and subgrade settlement control requirements,but also ensure the existing railway safely operate.
Research conclusions：Bag reinforced grouting pile is a new technology using a combination of grouting technology, geotextile fabric and reinforced materials. The main advantages are followings: (1)The isolation of geotextile bag can make slurry to expand bag and compact soil. Reinforced grouting pipe as grouting channel not only simplifies the construction process，but aslo greatly enhances the shear strength and resistance deformation. (2)Construction uses the ordinary rotary drilling rig which has many advantages, such as appropriate adjustment according to the site, small footprint range, lower limitations of space and headroom. (3)The method of returning slurry from the hole bottom is adopted to construction by sub-section injection, repeatedly supplementary slurry, which can better ensure the pile quality. (4)The test results show that the bag reinforced grouting pile can not only ensure the shear strength and capacity, but also adapt the limitations of construction site and space and headroom, it can be widely applied in the reinforcement of soft ground.
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