Existing cutting broadening roadbed structure in karst area and design and construction methods theref

A technology for karst areas and roadbeds, applied in the field of geotechnical engineering, can solve the problems of increased investment, high engineering risks, and high engineering costs, and achieve the effects of saving investment, controlling engineering investment, and simplifying construction.

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 to provide the existing road cutting widening roadbed structure and design and construction method in the karst area in view of the problems of high engineering risk and high engineering cost in the prior art.

Method used

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  • Existing cutting broadening roadbed structure in karst area and design and construction methods theref
  • Existing cutting broadening roadbed structure in karst area and design and construction methods theref
  • Existing cutting broadening roadbed structure in karst area and design and construction methods theref

Examples

Experimental program
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Effect test

Embodiment 1

[0048] refer to figure 1 , the existing road cutting in the karst area of ​​the present invention widens the subgrade structure, widens the subgrade 6 base karst cave 9 areas and arranges the long pile 1 and the short pile 2, widens the subgrade 6 base non-karst cave area and arranges the short pile 2; the light replacement body 3 is arranged on the long pile 1 and short pile 2 on top of the pile; soil filler 4 is filled on the light replacement body 3; drainage ditches 5 are arranged on both sides of the light replacement body 3.

[0049] In the above scenario:

[0050] refer to figure 2 , 3 , both the long pile 1 and the short pile 2 are composite lightweight piles composed of a pile-forming lightweight body 12 and a composite reinforced cage 11 embedded in it, and the composite reinforced cage 11 is composed of vertical geogrids arranged at circumferential intervals The grid 111 and the annular geogrid 112 arranged at vertical intervals are composed of the vertical geog...

Embodiment 2

[0075] Such as Figure 1-3 As shown, this embodiment specifically demonstrates the design method for widening the subgrade 6 structure during construction, and the specific design process:

[0076] The design speed of a high-speed railway is 300km / h (ballastless track), and the line spacing is 4.8m. In order to meet the design requirements of introducing a large hub, it is necessary to widen the existing ballastless railway cutting and build a new cutting. The site belongs to the karst landform. The underlying complex karst. According to the geophysical prospecting data, it is determined that there is a hidden karst 8 at the base of the existing cutting 7, and there is an underlying karst cave 9 at the base of the newly built cutting. 9 The overlying stratum is strongly weathered limestone interbedded with sand and gravel. In order to reduce the disturbing influence of the newly-built cutting on the existing railway and control the project investment, the existing cutting 7 ...

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Abstract

The invention discloses an existing cutting broadening roadbed structure in a karst area. The structure comprises a basement karst cave area and a basement non-karst cave area. The basement karst cavearea is provided with long piles and short piles, the basement non-karst cave area is provided with short piles, the bottoms of the long piles are arranged in a stable stratum below the basement karst cave area, light replacement bodies are arranged on the tops of the long piles and the tops of the short piles and filled with soil fillers, and drainage ditches are formed in two sides of the lightreplacement bodies. The light soil material is low in density and high in pressure resistance, so that the additional stress for widening the roadbed is reduced; the light replacement body can improve the structural integrity, enables the load of an upper structure to be smoothly transmitted to the lower long pile and the lower short pile, so that the eccentric force is avoided; the load of an upper roadbed, a rail and a train is carried effectively, an equal-load replacement effect is realized, the additional stress acting on a karst cave top plate is reduced effectively, and deformation anddamage are avoided. On the basis of the structure, upward arching of an existing cutting caused by grouting can be avoided, and safe operation of a high-speed train is guaranteed; the structure is low in engineering cost, and engineering investment is effectively controlled.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to an existing road cutting widening subgrade structure in a karst area and a design and construction method. Background technique [0002] In recent years, with the rapid development of rail transit, it is inevitable that new (structure) buildings and existing buildings (structure) will cross influence, and the relationship between the two includes close adjacency, overspan, underpass, etc. Under the additional load of new (structure) buildings, the existing buildings (structure) may have uneven settlement, tilt instability, crushing and fracturing and other diseases, and even cause major safety accidents. With the gradual network of high-speed railways, the newly built railways are bound to be connected to the national eight vertical and eight horizontal trunk lines. [0003] In the design of high-speed ballastless railway, in order to meet the purpose of line co...

Claims

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Application Information

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IPC IPC(8): E01B2/00E02D5/34E03F5/04G06F30/13G06F30/20G06F119/14
CPCE01B2/006E02D5/34E03F5/04
Inventor 陈伟志谢荣强刘剑光李楚根周和详
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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