In recent years, the highway construction scale in our country is expanding, and variety of special soil conditions are encountered more and more in projects. Most of the special soil's
When the full weathered granite is regarded as highway subgrade filling material, it is suffered from the application restriction because of its high mica content, lax construction, bad water stability, and small cohesion. For these reasons, the full weathered granite soil should be improved before using for subgrade filling, and the cement was taken as improver in this paper. The dynamic and static characteristics of cement stabilized soils were studied systemically. It was shown from the experiment results that there is a decrease in the content of mica and clay, and a increase of quattz of the cement stabilized soils. The unconfined strength of the cement stabilized full weathered granite increases linearly with the increase in cement content. There is power function relationship between water stability coefficient and the cement content. The unconfined strength and water stability coefficient increases with degree of compaction and with age as well, while the increasing rate decrease with age. The dynamic strength of the cement stabilized full weathered granite increased with the increase of the degree of compaction and the cement content. However, as the water content increases, the dynamic strength increased first and then decreases, there is an optimum moisture content. A linear model was proposed to describe the dynamic modulus and dynamic relationship between the stress amplitude. Aiming at its high mica content、lax construction 、bad water stability and small cohesion, this paper used joining cement to modify the full weathered granite, and it has carried out a comprehensive and systematic experimental research and in-depth analysis to the dynamic and static engineering properties of the cement stabilized soils after modified.
The physical mechanical properties of the cement stabilized full weathering granite soil related to the size and content of mica. Through mineral analysis of soil samples, conbined particle analysis, contrast test of CBR and resilient modulus were studied. The test result is shown in table 1. Therefore, after improvement by adding cement to the full weathering granite soil, the percentage content of mica and clay decreased, and the percentage content of quartz increased. That shows the properties of cement stabilized full weathering granite soil tends to be stable after one week. The CBR and resilient modulus of the cement stabilized full weathering granite soil related to the content of mica, as shown in Figure 1~3.
The variation law of the Strength, stiffness and water stability of the cement stabilized full weathering granite soil with the cement content、age、moisture content and compactness is studied systematically.