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Equal-load replacement light soil side wide roadbed structure, and design and construction methods thereof

A light soil and subgrade technology, applied in the field of geotechnical engineering, can solve problems such as reducing additional stress, affecting ride comfort and comfort, and reducing eccentric force, so as to reduce vertical or lateral deformation and reduce ecological environment damage , Reduce the effect of additional stress

Active Publication Date: 2020-07-10
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: aiming at the prior art: when the subgrade section is connected to the existing railway and the side width structure of the ballastless railway subgrade is constructed, it is easy to cause the vertical or lateral deformation of the existing ballastless railway subgrade to exceed the limit, threatening the safety of the train operation, and it may also affect the smoothness and comfort of the new railway in the lead-in section. It provides a kind of equal-load replacement of light-weight soil side wide subgrade structure, design and construction method, which can greatly reduce the cost of new subgrade in the existing The base of the ballastless railway subgrade forms additional stress, minimizes the vertical or lateral deformation of the existing ballastless track subgrade, and greatly reduces the eccentric force of the new subgrade structure to the existing ballastless track subgrade, while greatly saving construction the land

Method used

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  • Equal-load replacement light soil side wide roadbed structure, and design and construction methods thereof
  • Equal-load replacement light soil side wide roadbed structure, and design and construction methods thereof
  • Equal-load replacement light soil side wide roadbed structure, and design and construction methods thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Such as Figure 1-2 As shown, a kind of equal-load replacement lightweight soil side wide subgrade structure described in this embodiment, refer to figure 1 , the present invention replaces the wide subgrade structure of lightweight soil side with equal load, including composite lightweight piles 1, which are arranged vertically and horizontally at intervals in the foundation 5 adjacent to the existing ballastless track subgrade 6; Pile 1 pile top; connecting steel bars 3, one end of which is anchored into the pile body, and one end is fixedly connected with the light soil tank 2; the soil filler layer 4 is filled in the light soil tank 2.

[0061] In the above scenario:

[0062] refer to figure 2 , the composite lightweight pile 1 includes a pile-forming lightweight body 11 and a composite reinforced cage 12 embedded therein, and the composite reinforced cage 12 is composed of vertical geogrids 121 and vertically spaced The set annular geogrid 122 is formed, the ve...

Embodiment 2

[0066] Such as Figure 1-4 As shown, a kind of design method of equal-load replacement light soil side wide subgrade structure described in embodiment 1 described in this embodiment, the method comprises the following steps:

[0067] ①. Preliminary determination of composite lightweight pile 1 pile diameter d 0 , the unit is m; the length of one composite light pile is l, the unit is m; the distance between one composite light pile is s, the unit is m;

[0068] ②. Determine the total weight W of the lightweight soil tank 2, the soil filling layer 4 and the upper track structure by the following formula z :

[0069] W z =(B-0.5mh)shγ n1 +(B-2d-0.5mh n2 )( n2 -γ n1 )sh n2 +

[0070] 2sb 1 q 1 +(s 1 -b 1 ) sq 0 -(B-mh-0.5m△h)(γ-γ n1 )△hs

[0071] where W z is the total weight of light soil tank 2, soil filler layer 4 and upper track structure, in kN; B is the top width of side-width subgrade, in m; b is the bottom width of side-width subgrade, in m; m is the exis...

Embodiment 3

[0079] Such as Figure 1-4 As shown, this embodiment shows the design method of equal-load replacement of light-weight soil side wide subgrade structure. The specific design process: the design speed of a new high-speed railway is 300km / h, and the line spacing is s 1 4.8m To introduce the existing ballastless railway, it is necessary to fill the roadbed adjacent to the existing ballastless track with a height of 3.2m and a slope ratio of 1.5 for side width construction. The stratum is silty clay, and the gravity γ is 19kN / m 3 . In order to eliminate the influence of the side width roadbed on the existing ballastless railway, the design intends to adopt the equal load replacement light soil side width roadbed structure of the present invention. During the design process, the cantilever thickness d of the light weight soil tank 2 is 1.0m, and the The foundation depth Δh is 1.0m, and the weight of light soil γ n1 To take 5kN / m 3 , thickness of soil filling layer h n2 To take ...

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Abstract

The invention relates to the field of geotechnical engineering, in particular to an equal-load replacement light-soil-side wide roadbed structure and design and construction methods thereof. The roadbed structure comprises a material containing groove with an opening in the top. An inclined cantilever is arranged on one side of the material containing groove and can abutted against a side slope ofan existing ballastless track roadbed, a supporting beam is arranged at the bottom of the material containing groove, and a reinforcing pile assembly is connected to the bottom of the supporting beamand comprises a reinforcing pile. The material containing groove is sequentially filled with a soil filler layer and a light soil layer from top to bottom. According to the equal-load replacement light-soil-side wide roadbed structure, the upper load of the reinforcing pile assembly is reduced, the upheaval acting force on the side wall of the reinforcing pile can be transmitted back to the lowerfoundation through the anchoring effect of the pile body, so that upheaval deformation of the roadbed widening structure can be effectively controlled, the overall load of the structure can be effectively borne, and sedimentation deformation is controlled; and the construction land is greatly saved, and the damage to the ecological environment is reduced.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a subgrade structure, design and construction method for equal-load replacement of light-weight soil with side width. Background technique [0002] In recent years, with the rapid development of engineering buildings, it is inevitable to build new buildings (structures) adjacent to existing buildings (structures). [0003] Under the additional load of new (structure) buildings, the existing buildings (structure) may have uneven settlement, tilt instability and other diseases, and even cause major safety accidents. The subgrade section is connected to the existing railway. At this time, the new project will face the problem of building the side width of the existing ballastless railway subgrade. If this kind of side width construction project is not handled properly, it will easily cause vertical or sideways damage to the existing ballastless railway subgrade. If the later...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B2/00E02D5/34G06F30/13G06F30/20G06F119/14
CPCE01B2/006E02D5/34
Inventor 陈伟志闵卫鲸孙晓周成吴沛沛
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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