Lightweight subgrade structure, design and construction methods above operating tunnels

A lightweight, tunnel-based technology, applied in infrastructure engineering, roads, roads, etc., can solve problems such as structural deformation and cracking of underlying operating tunnels, affecting the normal use of tunnels, threatening traffic operation safety, etc., to reduce ecological environment damage, Guaranteed normal use function and remarkable environmental benefits

Active Publication Date: 2021-11-26
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the load of the newly built subgrade structure is too large, it may cause deformation and cracking of the underlying operating tunnel structure, which will affect the normal function of the tunnel; if it is severe, it may cause crushing and damage to the operating tunnel, threatening the safety of various traffic operations

Method used

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  • Lightweight subgrade structure, design and construction methods above operating tunnels
  • Lightweight subgrade structure, design and construction methods above operating tunnels
  • Lightweight subgrade structure, design and construction methods above operating tunnels

Examples

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Effect test

Embodiment 1

[0055] refer to figure 1 , the light subgrade structure above the operating tunnel of the present invention, the composite lightweight piles 1 are arranged in rows along the longitudinal interval of the line in the rock foundation D above the tunnel 10 in the operating state; the light body 2 is arranged on the composite lightweight piles 1 On the top; the U-shaped light tank 3 is set on the top of the light body 2; the soil filler 4 is filled in the U-shaped light tank 3; the drain 5 is set on both sides of the light body 2.

[0056] In the above scenario:

[0057] refer to figure 2 , 3 , the composite lightweight pile 1 includes a pile-forming lightweight body 6 and a composite reinforced cage 7 embedded in it, the composite reinforced cage 7 is composed of vertical geogrids 71 ​​arranged at circumferential intervals and annular geogrids arranged at vertical intervals Grids 72 are formed. Vertical geogrids 71 ​​and ring-shaped geogrids 72 are converging and connected as...

Embodiment 2

[0083] Such as Figure 1-6 As shown, this embodiment specifically demonstrates the design method for the subgrade structure in construction, and the specific design process:

[0084] A newly built high-speed railway has a design speed of 300km / h (ballastless track) and a line spacing of 4.8m. In order to meet the design requirements for introducing a large hub, it is necessary to build a subgrade project above the operating subway tunnel 10 (the top surface of the tunnel is about 20m from the surface) (height h =3.5m, width B =14.6m), the overlying stratum of tunnel 10 is silty clay. The design intends to adopt the light subgrade structure above the operating tunnel 10 of the present invention. In the design process, the slope ratio of the light subgrade m Take 0.2, soil filler 4 thickness h n2 Take 0.5m, U-shaped lightweight tank 3 (the thickness of the bottom plate is taken as 1.5m) and the thickness of the cantilever at both ends b Take 1.0m, lay 6RTS Ⅰ type slab balla...

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Abstract

The invention discloses a lightweight subgrade structure, design and construction method above the operating tunnel, including composite lightweight piles, lightweight bodies, U-shaped lightweight grooves and drainage ditches, and the composite lightweight piles are arranged in rows at intervals along the longitudinal direction of the line. In the rock and soil foundation above the state tunnel, the composite lightweight pile includes a piled lightweight body, the light body is set on the top of the composite lightweight pile, the U-shaped light groove is set on the top of the light body, and the top of the U-shaped light groove is filled It is built with soil filling, and the drainage ditch is located at both ends of the lightweight body. Combining the characteristics of low density, high compression resistance and upright appearance of lightweight soil materials, based on the hoop effect of composite reinforced cage and the reinforcement effect of vertical geogrid and annular geogrid, an equal-load replacement method is proposed. Lightweight subgrade structure. It can achieve the purpose of building the subgrade above the operating tunnel, and the additional load of the subgrade is small, which can ensure the normal use function of the tunnel structure and the safe operation of the vehicles in the tunnel. The structure saves construction land, reduces damage to the ecological environment, and has remarkable social, economic, and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a lightweight subgrade structure, design and construction method above an operating tunnel. 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 have cross-effects. Under the additional load of new (structure) buildings, existing buildings (structures) may have uneven settlement, tilt instability, crushing and fracturing and other diseases, and even cause major safety accidents. [0003] At present, subways have been opened and operated in many cities in China, especially in developed cities, subways and other rail transits have formed a complex network of relationships. New construction will have engineering disturbance effects on the operating rail transit. For example, the construction of subgrade structures above the operating tunnels...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/00E01C3/04E02D5/22E02D5/34E01F5/00G06F30/13G06F119/14
CPCE01C3/00E01C3/04E01F5/00E02D5/22E02D5/34
Inventor 陈伟志郭在旭刘勇李楚根朱曦
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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