Roadbed having pile-net combination structure and construction method thereof

Abstract

The invention provides a roadbed having a pile-net combination structure and a construction method thereof, which solves the technical problems that soft-soil foundation in superlarge area cannot be treated effectively and post-construction settlement cannot be effectively overcome in the prior art. The roadbed comprises prestress tubular piles (1), prestress tubular pipe caps (2), a prestress tubular pile ground beam (3) and a cushion layer (4), wherein the cushion layer (4) sequentially consists of a first gravel cushion layer (5), a first medium-coarse sand cushion layer (6), a geogrid (7), a second medium-coarse sand cushion layer (8) and a second gravel cushion layer (9) from bottom to top. The thickness of each gravel cushion layer is 25mm, the grain diameter of gravel in the gravel cushion layers is smaller than or equal to 3mm, the silt content of the gravel cushion layers is smaller than or equal to 5%, the thickness of each medium-coarse cushion layer is 5mm, the silt content of the medium-coarse cushion layers is smaller than or equal to 5%, bidirectional tension strength of the geogrid (7) is larger than or equal to 80 kilonewton / m, extension rate of the geogrid (7) is smaller than or equal to 15%, and compacting factor of the cushion layer (4) is smaller than 0.9. The invention further discloses a construction method of the roadbed. The roadbed is low in general manufacturing cost and has excellent economic benefits and popularization value.

Description

technical field [0001] The invention relates to a railway embankment, in particular to a railway embankment with a pile-net composite structure and a construction method thereof under complex marine sedimentary thick soft soil geological conditions. Background technique [0002] In the construction process of high-speed railway subgrade, it is the most basic requirement to build a stable subgrade, and it is required that the subgrade should not produce uneven settlement after construction. During the civil construction of the subgrade, when encountering silt, silty clay and silty sand with high water content, high liquid limit, high compressibility, large porosity, high sensitivity, under-consolidation, and low mechanical strength When complex marine sediments deposit thick soft soil layers, traditional railway soft soil foundation reinforcement methods and traditional roadbeds can no longer meet the basic requirements for stability, which seriously restricts the progress o...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a roadbed with a pile-net composite structure and its construction method, which solves the technical problems that the existing technology cannot effectively deal with super-large-area soft soil foundations and effectively overcome post-construction settlements

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