A special composite geotechnical material for high-grade roadbed and its preparation method

Abstract

The invention discloses a special composite geotechnical material for high-grade subgrades and a preparation method thereof, comprising a lower waterproof layer, a drainage board and an upper water-permeable layer, the lower waterproof layer and the upper water-permeable layer are connected through the drainage board, and the hydrophilic surface of the lower waterproof layer faces Down, the hydrophobic side faces up and contacts the lower drainage panel of the drainage board, and the hydrophobic side of the upper permeable layer contacts the upper drainage panel of the drainage board; Divert the water so that it enters the drainage board and discharges it through the drainage groove to reduce the pressure of groundwater on the subgrade and the damage of groundwater frost heave to the subgrade, so as to ensure the effect of road construction and use; at the same time, when the upper drainage panel and the lower drainage panel are under pressure When the support column is deformed, the arc-shaped side wall of the support column fits with the outer wall of the drainage protrusion and squeezes each other to realize self-locking, so that the volume of the drainage tank does not change after self-locking, ensuring the drainage effect. It has the characteristics of novel structure and strong practicability.

Description

technical field [0001] The invention relates to the technical field of road construction materials, in particular to a special composite geotechnical material for high-grade roadbeds and a preparation method thereof. Background technique [0002] During the construction of highways and railways in my country, geotechnical materials are widely used in roadbed waterproofing and roadbed reinforcement due to their good stability, corrosion resistance, decomposition resistance, and ease of use. [0003] The current geotechnical materials mostly use geotextiles to strengthen the roadbed, which can strengthen the strength of the roadbed and prevent seepage, and reduce the erosion of the groundwater on the soft soil foundation. However, due to the large amount of groundwater accumulated under the geotextile, it is easy to cause the subgrade Swelling occurs, causing the roadbed to be unstable, which in turn affects road construction; moreover, if in the alpine region, a large amount ...

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Problems solved by technology

[0003] The current geotechnical materials mostly use geotextiles to strengthen the roadbed, which can strengthen the strength of the roadbed and prevent seepage, and reduce the erosion of the groundwater on the soft soil foundation. However, due to the large amount of groundwater accumulated under the geotextile, it is easy to cause the subgrade Swelling occurs, causing the roadbed to be unstable, which in turn affects road construction; moreover, if in the alpine region, a large amount of groundwater accumulates below the roadbed, freezes at low temperature, and becomes larger in size, causing damage to the roadbed and affecting the use of the road;

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