High-speed railway expanding cement slurry post-grouting bulk material pile composite foundation construction method

Abstract

The invention provides a high-speed railway expanding cement slurry post-grouting bulk material pile composite foundation construction method. The high-speed railway expanding cement slurry post-grouting bulk material pile composite foundation construction method comprises the steps that segmented drilling for hole forming is conducted; grouting pipes are placed in a drill hole in a segmented connection mode, and the grouting pipes are bent by 90 degrees and extend out of the two sides of a roadbed in the horizontal direction; a bulk material is put in the drill hole; a reinforced gravel cushion layer is laid on the surface of a foundation; layered filling of embankment soil is carried out on the cushion layer; foundation soil is subjected to consolidated drainage; and expanding cement slurry is injected into the grouting pipes to form rigid pile bodies. The drainage performance of the bulk material is fully utilized to enable inter-pile soil to be subjected to drainage consolidation during embankment filling, the carrying capacity of pile foundations is improved through the expanding cement slurry, properties of the inter-pile soil are improved, and the advantages such as small post-construction settlement are achieved.

Description

Technical field [0001] The invention belongs to the technical field of foundation engineering, and in particular relates to a method for constructing a composite foundation of high-speed railway expanded cement slurry post-grouting granular material piles. Background technique [0002] The rapid development of high-speed railways in my country, but my country’s vast territory and outstanding differences in geological conditions, the soft soil foundations that need to be reinforced are widely distributed, and high-fill and high-backfill foundations are also common in the western region. This is important for the construction of high-speed railways. It is extremely unfavorable. In the actual construction process, the pile-soil composite foundation method is often used to make up for these defects of insufficient foundation bearing capacity. However, it is obvious that the soil of this type of foundation is loose and insufficiently compacted, which leads to a loose pile-soil contact...

AI Technical Summary

Problems solved by technology

[0003] However, as a kind of flexible pile composite foundation, the traditional crushed stone pile only focuses on the function of the foundation itself, and does not significantly improve the soil between the piles that has a significant impact on the quality of foundation reinforcement, and the post-construction settlement is relatively large; and the pile construction Machinery often requires high clearance, which is not conducive to construction in complex environments with obstacles such as high-voltage lines or existing lines. Therefore, an emerging technology is urgently needed to make up for the above shortcomings and provide more reliable bearing capacity for high-speed railway subgrades.

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