The Study Of Pavement Performance For Highway Runway Silty Soil Subgrade

In China, the hydraulic causes of silt is widely distributed in the alluvial plains, river deltas, coastal plains. Natural low moisture content of the silt, plastic small, poor water holding capacity, water loss fast filling with silt subgrade, even if the construction of RCC is forming, but with the evaporation of water loss, topsoil experience appears loose, in the subsequent construction vehicles repeated under deep rut, and adversely affected. Silt Subgrade in road went in, to withstand the impact load when the planes taking off and landing, its performance and stability remains to be further research. Henan Yellow River Basin in eastern regional distribution of a wide range of silty sand, if you can make the best of silty sand along the roadbed construction materials, can effectively reduce the project cost, a significant social and economic benefits. Silt Subgrade material properties of highway runway system to carry out test research to reveal the use of the highway runway Silt Subgrade performance, has an important significance for promoting the application of powder sand in construction projects.Silt Subgrade characteristics, relying on Zheng China highway engineering, physical and mechanical properties of the material powder sand reclaimed from used as a roadbed, pavement performance, subgrade settlement, and roadbed construction quality control for rapid detection technology has carried out systemstudy, the main results are as follows:1. Indoor and outdoor experiments, the system of physical and mechanical properties of the silt, such as:moisture content, density, liquid limit, plastic limit, plasticity refers to the compression coefficient, particle size distribution, etc.; triaxial apparatus has been siltsoil internal friction angle, cohesion, strength mechanical index; provide a technical reference for a comprehensive understanding of the characteristics of the materials of the Silt Subgrade.2. Studied highway runway Silt Subgrade CBR and bearing plate resilient modulus test results showed that in the control of construction technology and quality, powder sand has a good road performance is good roadbed of fillingmaterials; and practical engineering, to carry out the settlement after the observation, and secondary consolidation settlement of semi-logarithmic prediction model provides a reference for the wide application of the silt.3. Through the DCP, long-rod penetration test of the research, the establishment of the DCP, long-rod penetration and CBR, resilient modulus, the relationship of the degree of compaction to explore the DCP, long-rod penetration, rapid detection methods, the polepenetration instrument detection results were evaluated by analysis, for the use of the DCP, the pole penetration Silt Subgrade construction quality rapid control provides a new way of thinking.