A construction method for expansive soil subgrade with high groundwater level and low filling and shallow excavation

A construction method and soil roadbed technology, applied in roads, buildings, tracks, etc., can solve problems such as roadbed diseases, achieve the effects of stable roadbed structure, reduce construction difficulty, and save costs

Active Publication Date: 2020-07-10
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing pile raft structure mentioned in the above-mentioned background technology is easy to cause roadbed diseases when it is applied to a high groundwater level area, and to provide a high groundwater level low filling shallow excavation expansive soil roadbed construction method

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  • A construction method for expansive soil subgrade with high groundwater level and low filling and shallow excavation

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] In view of the Huanghuai Plain and Nanyang Basin high-level areas where the Zhengwangao Railway Line passes through, it is a high-water-table expansive soil foundation structure. In order to prevent the subgrade from being arched by the water-absorbing expansion force of the expansive soil, piles are poured under the subgrade filling layer in this embodiment. raft structure.

[0029] Such as figure 1 As shown, the pile raft structure of this embodiment includes a plurality of reinforced concrete piles 1 vertically supported below the roadbed filler layer and a reinforced concrete raft 2 fixed on the upper end of the reinforced concrete piles 1 . The reinforced concrete pile 1 is a bored cast-in-place pile with a pile diameter of 0.6-1.0m. The reinforced concrete raft 2 is located directly below the roadbed filler layer, and i...

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Abstract

The invention relates to the technical field of rail roadbed structures, in particular to a construction method for a light-filling shallow-excavation expansive soil roadbed with high underground water level. The construction method comprises the following steps of: excavating foundation soil until the bottom surface of a roadbed foundation bed; constructing a reinforced concrete pile on the bottom surface of the roadbed foundation bed; pouring a reinforced concreter raft; pouring a bearing plate; backfilling water seepage soil at the two sides of the reinforced concrete raft and the bearing plate; starting to fill a foundation bed filler layer from the upper end surface of the bearing plate; constructing a water drainage ditch on a foundation of one side, away from the foundation bed, ofthe water seepage soil, enabling the water drainage ditch to communicate with the water seepage soil, draining underground water below and at the two sides of the reinforced concrete raft for enablingthe filler on the bearing plate to be in a dried state. The roadbed structure sufficiently integrates the integral structure of the pile and the raft with high filler replacement and water drainage limit to successfully solve the risk that expansive soil expands and arches upwards under action of saturated water, and to solve the problem that the foundation bed pumps mud.

Description

technical field [0001] The invention relates to the technical field of track subgrade structures, in particular to a construction method for a subgrade with high groundwater level and low fill and shallow excavation. Background technique [0002] Under the high groundwater level, low-fill and shallow-cut expansive soil subgrade of high-speed railway is generally replaced with permeable soil in the range of the subgrade bed, and the foundation is treated with pile-net composite foundation. This treatment measure can meet the subgrade settlement control requirements, but there are still some problems for high-speed railways with millimeter-level deformation requirements: some high-speed railways currently in operation have successively experienced some upturning diseases due to water absorption and expansion of expansive soil, and pile-net composite foundations have not Fully consider the anti-arching effect. Under the high groundwater level, the expansive soil is more likely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B2/00
CPCE01B2/00
Inventor 陈远洪曾长贤刘国骆斌王双权马克丰陈俊叶龙振高杰吴红岩
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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