CN205420937U

CN205420937U - Wind amasss husky frozen soil roadbed structure

Info

Publication number: CN205420937U
Application number: CN201620105821.6U
Authority: CN
Inventors: 韩风雷; 喻文兵; 胡达
Original assignee: Cold and Arid Regions Environmental and Engineering Research Institute of CAS
Current assignee: Cold and Arid Regions Environmental and Engineering Research Institute of CAS
Priority date: 2016-02-03
Filing date: 2016-02-03
Publication date: 2016-08-03
Anticipated expiration: 2026-02-03

Abstract

The utility model provides a wind amasss husky frozen soil roadbed structure, includes that the long -pending sand of wind fills layer, lateral restraint structure and the layer of banketing, fills a layer both sides at the long -pending sand of wind and is equipped with the lateral restraint structure, is equipped with the layer of banketing on it. The utility model discloses utilize the long -pending sand of dry wind to fill the layer and play the effect that blocks road bed upper portion heat entering lower part soil layer to can be so that lower part frozen soil keep the freeze mode, lateral restraint structure is wherein banketed, also can be the precast concrete piece, and its effect prevents that wind from amassing the deformation of sand bed on the horizontal direction, the utility model discloses a comprehensive function that the long -pending sand of dry wind filled layer and lateral restraint structure can keep frozen soil roadbed's heating power stable. The utility model discloses the structure is simple more, the construction is more convenient, can gather materials on the spot, need not excavate the new earthwork again, has the environmental protection effect. The utility model discloses a long -pending husky basis as the structure of dumped wind, construction cost is cheap, and it is thermal -insulated respond well to keep warm moreover, and it is stable to maintain frozen soil roadbed.

Description

A kind of frozen earth roadbed structure of drift-sand

Technical field

This utility model relates to Permafrost Area roadbed refrigeration structure, a kind of frozen earth roadbed structure of drift-sand.

Background technology

At present, road structure for Permafrost Area has block-stone embankment, ventilation pipe foundation, heat pipe roadbed, warming plate roadbed, these road structures, at Qinghai-Tibet Railway, are used widely on Qinghai-Tibet Highway etc. is frozen earth roadbed, but there is respective defect in these road structures, big and high two aspects of cost including difficulty of construction.

On the other hand, Qinghai-Tibet Platean hazards of sand storms ratio is more serious, and drift-sand is widely distributed at Qinghai-Tibet Highway and Qinghai-Tibet Railway, adversely affects frozen earth roadbed and frozen soil environment.

China's Qinghai-Tibet under preparation highway, it will be travelling through the ever-frozen ground of Qinghai-Tibet Platean, dust storm impact and ecologically fragile areas, therefore, researches and develops a kind of drift-sand frozen earth roadbed structure efficient, environmental protection with low cost and have important practice significance.

Utility model content

In sum, the purpose of this utility model is to provide a kind of frozen earth roadbed structure of drift-sand, on the basis of have studied drift-sand thermophysical property, reaches to maintain the purpose of subgrade stability by laying dry wind sand bottom roadbed.

The purpose of this utility model is realized by techniques below:

A kind of frozen earth roadbed structure of drift-sand, fills layer, lateral confinement structure and fill stratum including drift-sand, fills a layer both sides at drift-sand and be provided with lateral confinement structure, which is provided with fill stratum.

Above-mentioned dry wind sand is filled layer and is played the effect stopping that roadbed top heat enters bottom soil layer, so that bottom frozen soil keeps frozen state.

Above-mentioned lateral confinement structure can be to banket, it is also possible to is precast concrete block, and its effect is the deformation preventing aeolian accumulation sand bed in the horizontal direction.

The comprehensive function filling layer and lateral confinement structure in dry wind sand can keep frozen earth roadbed heating power to stablize.

Advantage of the present utility model and generation provide the benefit that:

1, this utility model is as frozen earth roadbed filler by dry wind sand, both sides are prevented drift-sand transversely deforming by lateral confinement structure, the frozen earth roadbed structure banketed in upper strata, this structure is relative to other frozen soil refrigeration road structure, and its structure is simpler, it is convenient to construct.

2, this utility model can be gathered materials on the spot, and need not again excavate the new earthwork, have Environmental Role.

3, this utility model uses discarded drift-sand as the basis of structure, and construction cost is cheap, and heat insulating effect is good, can remain frozen earth roadbed stable.

Accompanying drawing explanation

Fig. 1 is cross-section schematic diagram of the present utility model.

Fig. 2 is the temperature field after common fill subgrade Simulation prediction runs 50 years.

Fig. 3 is the temperature field after this utility model Simulation prediction runs 50 years.

In figure: 1-drift-sand fills layer, 2-lateral confinement structure, 3-fill stratum.

Detailed description of the invention

For being more fully understood that this utility model, it is further described below by embodiment:

As it is shown in figure 1, a kind of frozen earth roadbed structure of drift-sand, filling layer 1, lateral confinement structure 2 and fill stratum 3 including drift-sand, drift-sand fills layer 1 both sides and is provided with lateral confinement structure 2, which is provided with fill stratum 3.

Embodiment

On the natural surface of compacting, first carrying out the construction of lateral confinement structure 2, lateral confinement structure 2 uses concrete precast block, is then dried drift-sand between lateral confinement structure 2 and fills the construction of layer 1；(drift-sand heat conductivity 0.272W m^-1·K^-1, thickness 1.0m), finally, equally lay fill stratum (3) with common roadbed.

In order to confirm feasibility and the effectiveness of technique scheme, this utility model utilizes numerical simulation tests method that common fill subgrade and drift-sand fill subgrade temperature field are simulated prediction research (Fig. 2, Fig. 3).

The temperature of the 15m degree of depth that shows in Fig. 2 commonly to banket under wide cut roadbed is higher than-0.5 DEG C, and shows in Fig. 3 that under the ventilation wide cut roadbed of road structure of the present utility model, the temperature of the 15m degree of depth is less than-1.0 DEG C.

Result shows: drift-sand fill subgrade run melt on October 15th, 50 deep maximum time, its temperature is more much lower than the common fill subgrade of the same period.0 DEG C of line-2.62m under natural surface of common fill subgrade, and 0 DEG C of line 0.29m on natural surface of the drift-sand fill subgrade that this utility model uses, frozen soil upper limit has been lifted in Roadbed Soil, both comparing differences are notable, illustrate that the drift-sand fill subgrade structure that this utility model provides is ideal to the stablizing effect that maintenance is frozen earth roadbed.

Claims

1. the frozen earth roadbed structure of drift-sand, fills layer (1), lateral confinement structure (2) and fill stratum (3) including drift-sand, it is characterised in that: drift-sand fills layer (1) both sides and is provided with lateral confinement structure (2), which is provided with fill stratum (3).