Geogrid Erosion Control for Road Construction in Guangxi Province

In recent years, with the fasr development of social economy, the highway network of each city is also becoming more and more perfect. The first-class highway from Nanning City to Dongguan Daling Mountain is the backbone highway in the road network in western Guangxi. The road along the route is located in the south subtropical zone, which belongs to the marine monsoon climate, and the terrain is mainly hilly. The climate is hot and humid, with abundant rainfall. The east-southeast wind blows from April to August every year, and the northeast wind blows from October to March of the following year. The average temperature in July is 28°C, the average temperature in January is 12°C, and the average annual temperature is 22°C. The rainy season is from April to September every year and tropical cyclones are often attacked. The average annual rainfall is 1941 mm. The section where the highway is located belongs to the landform of low hills and denuded terraces. The weathered soil layer along the hills along the highway is very deep, generally more than 20 m. The slope of the roadbed is stable; at the same time, the fill height of the section between the hills that the route passes through is relatively large, and there are often weak soil layers. Measures to deal with the subgrade base. Generally speaking, the factors affecting the stability of subgrade slopes include engineering geology, hydrogeology, ground drainage conditions, topography and climate. Two solutions were proposed through the discussion of the construction unit. Three-dimensional vegetation nets or geogrids can be used to protect the slopes to minimize the damage of rainwater to the slopes. Considering the two aspects of cost and construction difficulty, we recommend the use of PP Biaxial Geogrid Erosion Control 50KN/50KN to the construction party.

Construction Procedures of Geogrid Erosion Control Cushion Treatment Foundation.

(1) Level the site first, clear the topsoil and drain the surface water.

(2) Lay a layer of 50 cm sand cushion on the foundation, and then lay a layer of PP 50/50 geogrid (with horizontal laying), the overlap length of each side is 20 cm, and U-shaped nails are used for the overlap edge In addition, the grid should be folded back 2 m at the edge of the embankment to facilitate grid anchoring. During construction, attention must be paid to the overlapping and anchoring quality of the grid. The construction method for laying multi-layer grids is similar, and the thickness of the fill between the two layers of grids is 50 cm.

(3) The subgrade soil should be filled in layers and meet the requirements of the corresponding specifications. In addition, the direct rolling of the material truck on the paved and tensioned grid should be avoided.

(4) During the construction, the filling rate of the embankment should be controlled and the observation of settlement and lateral displacement should be strengthened to prevent the embankment from becoming unstable. The use of the grid cushion to improve the bearing capacity of the foundation is not caused by the large deformation of the grid causing the upward component of the surface tension, but the vertical deformation of the upper filler is diffused to the horizontal direction through the grid so that the The shear deformation resistance of the upper filler can be fully exerted, so that the bearing area of ​​the foundation surface is increased, the surface pressure is reduced, and the purpose of improving the bearing capacity is achieved.

Specification of Geogrid Erosion Control for Road Construction in Guangxi Province

• Total quantity–42,000 squares meters
• Geogrid – 50kN/50KN
•  Each roll size is 6m*50m