阅读说明：本技术 一种相变控温的抗冻胀路基结构及其实施方法 (Phase-change temperature-control frost heaving resistant roadbed structure and implementation method thereof ) 是由 刘志彬 白梅 刘锋 张书建 张锦鹏 黄昊冉 于 2019-08-20 设计创作，主要内容包括：本发明公开了一种相变控温的抗冻胀路基结构,包括路基、侧向相变路基保温层、相变路基保温层和隔水土工布；所述侧向相变路基保温层沿路基坡度方向铺设,所述相变路基保温层和隔水土工布沿路基结构层方向铺设,隔水土工布设置在相变路基保温层下方；所述侧向相变路基保温层、相变路基保温层和隔水土工布将路基包围起来,在路基内部形成抗冻胀路基结构。本发明的路基结构能够通过相变材料的相变实现路基内部温度的自动调节,可以有效避免季节性冻土区的路基发生冻胀灾害,该路基结构施工简单、节能环保。(The invention discloses a phase-change temperature-control frost heaving resistant roadbed structure, which comprises a roadbed, a lateral phase-change roadbed heat-insulating layer, a phase-change roadbed heat-insulating layer and waterproof geotextile; the lateral phase change roadbed heat insulation layer is laid along the roadbed gradient direction, the phase change roadbed heat insulation layer and the water-proof geotextile are laid along the roadbed structure layer direction, and the water-proof geotextile is arranged below the phase change roadbed heat insulation layer; the lateral phase change roadbed heat insulation layer, the phase change roadbed heat insulation layer and the water-proof geotextile surround the roadbed, and an anti-frost heaving roadbed structure is formed inside the roadbed. The roadbed structure can realize automatic adjustment of the temperature inside the roadbed through phase change of the phase change material, can effectively avoid frost heaving disasters of the roadbed in a seasonal frozen soil area, and is simple in construction, energy-saving and environment-friendly.)

1. The utility model provides an anti frost heaving roadbed structure of phase transition accuse temperature which characterized in that: the roadbed comprises a roadbed, a lateral phase change roadbed heat insulation layer, a phase change roadbed heat insulation layer and waterproof geotextile;

the lateral phase change roadbed heat insulation layer is laid along the roadbed gradient direction, the phase change roadbed heat insulation layer and the water-proof geotextile are laid along the roadbed structure layer direction, and the water-proof geotextile is arranged below the phase change roadbed heat insulation layer;

the lateral phase change roadbed heat insulation layer, the phase change roadbed heat insulation layer and the water-proof geotextile surround the roadbed, and an anti-frost heaving roadbed structure is formed inside the roadbed.

2. The roadbed structure of claim 1, wherein: the thickness of the lateral phase change roadbed heat insulation layer is 20-30cm, and the distance between the outer edge of the lateral phase change roadbed heat insulation layer and the side surface of the roadbed is 50-80 cm.

3. The roadbed structure of claim 1, wherein: the thickness of the phase change roadbed heat insulation layer is 15-25cm, and the phase change roadbed heat insulation layer is arranged at a position 2/3-4/5 of the height of the roadbed.

4. The roadbed structure of claim 1, wherein: the lateral phase change roadbed heat insulation layer is formed by filling phase change blast furnace slag aggregates, wherein the phase change blast furnace slag aggregates absorb phase change materials tetradecane and are obtained by wrapping an epoxy resin shell outside a core.

5. the adsorption process is

The roadbed structure of claim 4, wherein: the thickness of the epoxy resin shell is 3-6 mm.

6. the roadbed structure of claim 1, wherein: the phase-change roadbed heat-insulating layer is formed by filling phase-change steel slag aggregates, wherein the phase-change steel slag aggregates are obtained by taking steel slag adsorbed with phase-change material tetradecane as an inner core and wrapping an epoxy resin shell outside the inner core.

7. The roadbed structure of claim 6, wherein: the thickness of the epoxy resin shell is 3-6 mm.

8. A method for implementing a roadbed structure according to claim 1, characterized in that: the method comprises the following steps: filling a roadbed by using a filler, and paving a lateral phase change roadbed heat insulation layer along the gradient of the roadbed while paving the roadbed, wherein the thickness of the lateral phase change roadbed heat insulation layer is 20-30cm, and the distance from the outer edge of the lateral phase change roadbed heat insulation layer to the side surface of the roadbed is 50-80 cm; when the road foundation reaches 2/3-4/5 of the designed height of the road foundation, a layer of waterproof geotextile is laid on the surface of the road foundation, a phase change road foundation heat preservation layer is laid above the waterproof geotextile, and then the road foundation is filled until the designed height is reached.

Technical Field

The invention belongs to the technical field of roadbed construction, and particularly relates to a phase-change temperature-control frost heaving resistant roadbed structure and an implementation method thereof.

Background

Seasonal frozen soil areas are widely distributed in China, occupy about half of the area of the national soil, and are very expensive in the aspect of repairing roadbed and pavement frost heaving disasters every year. Three necessary conditions for causing frost heaving of the roadbed are respectively (1) easily frozen soil; (2) higher water content in the soil mass; (3) and (5) carrying out negative temperature. The common method for eliminating frost heaving disaster from the aspect of causing frost heaving of the roadbed is to replace easily frozen soil with frost-resistant soil with better soil property, but the method has large workload and high cost in actual operation and is not suitable for wide application. Another method to eliminate frost heaving in roadbeds is to lay a drainage geotextile in the roadbed to drain excess water from the roadbed, but this method does not take into account the effect of capillary water. Engineering practices show that capillary water rising caused by shallow groundwater is one of the main reasons for higher water content of the roadbed in the seasonal frozen soil area. At present, the method for eliminating the freezing injury from the temperature perspective is to add a heat source in a roadbed, and the method has high manufacturing cost and huge energy consumption, and does not accord with the concept of energy conservation and environmental protection.

Therefore, the design of the roadbed structure which has the advantages of small construction work amount, low manufacturing cost, energy conservation and environmental protection has important engineering significance.

Disclosure of Invention

The invention aims to design a phase-change temperature-control frost heaving resistant roadbed structure, which can automatically adjust the temperature inside a roadbed through the phase change of a phase-change material, thereby preventing disasters such as roadbed frost heaving and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

a phase-change temperature-control frost heaving resistant roadbed structure comprises a roadbed, a lateral phase-change roadbed heat-insulating layer, a phase-change roadbed heat-insulating layer and waterproof geotextile;

The lateral phase change roadbed heat insulation layer is laid along the roadbed gradient direction, the phase change roadbed heat insulation layer and the water-proof geotextile are laid along the roadbed structure layer direction, and the water-proof geotextile is arranged below the phase change roadbed heat insulation layer;

The lateral phase change roadbed heat insulation layer, the phase change roadbed heat insulation layer and the water-proof geotextile surround the roadbed, and an anti-frost heaving roadbed structure is formed inside the roadbed.

Furthermore, the thickness of the lateral phase change roadbed heat insulation layer is 20-30cm, and the distance between the outer edge of the lateral phase change roadbed heat insulation layer and the side surface of the roadbed is 50-80 cm.

Furthermore, the thickness of the phase change roadbed heat insulation layer is 15-25cm, and the phase change roadbed heat insulation layer is arranged at a position 2/3-4/5 of the height of the roadbed.

Furthermore, the lateral phase change roadbed heat insulation layer is formed by filling phase change blast furnace slag aggregates, wherein the phase change blast furnace slag aggregates absorb phase change materials tetradecane and are obtained by taking blast furnace slag as an inner core and wrapping an epoxy resin shell outside the inner core.

Further, the thickness of the epoxy resin shell is 3-6 mm.

Furthermore, the phase-change roadbed heat-insulating layer is formed by filling phase-change steel slag aggregates, wherein the phase-change steel slag aggregates are obtained by taking steel slag adsorbed with phase-change material tetradecane as an inner core and wrapping an epoxy resin shell outside the inner core.

Further, the thickness of the epoxy resin shell is 3-6 mm.

The implementation method of the roadbed structure comprises the following steps:

Filling a roadbed by using a filler, and paving a lateral phase change roadbed heat insulation layer along the gradient of the roadbed while paving the roadbed, wherein the thickness of the lateral phase change roadbed heat insulation layer is 20-30cm, and the distance from the outer edge of the lateral phase change roadbed heat insulation layer to the side surface of the roadbed is 50-80 cm; when the road foundation reaches 2/3-4/5 of the designed height of the road foundation, a layer of waterproof geotextile is laid on the surface of the road foundation, a phase change road foundation heat preservation layer is laid above the waterproof geotextile, and then the road foundation is filled until the designed height is reached.

Has the advantages that:

compared with the traditional roadbed structure, the invention has the following advantages:

1. According to the invention, the phase change roadbed heat insulation layer is laid in the roadbed, so that a freezing frontal surface can be effectively prevented from entering the roadbed from top to bottom; and meanwhile, a lateral phase change roadbed heat insulation layer is laid on the side surface of the roadbed, so that the roadbed is further prevented from being frozen.

2. The invention adopts the phase-change material to realize the automatic regulation of the temperature inside the roadbed, saves energy, protects environment and conforms to the green development concept.

drawings

fig. 1 is a cross-sectional view of the frost heaving resistant roadbed structure in example 1, wherein: the roadbed is 1, the lateral phase change roadbed heat insulation layer is 2, the phase change roadbed heat insulation layer is 3, and the waterproof geotextile is 4.

Fig. 2 is a schematic structural view of a phase change steel slag aggregate in example 1, wherein: 3-1 is an epoxy resin shell, and 3-2 is steel slag absorbing tetradecane.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.