加筋碎石力学性能试验研究

Experimental Study on Mechanical Properties of Geosynthetic Reinforced Crushed Stone

为促进加筋碎石在高等级沥青路面结构之中的应用,特征采用3种加筋材料(土工布、双向土工格栅、三向土工格栅)、2种级配碎石进行了不同组合工况下加筋碎石的无侧限抗压试验。试验结果表明:①碎石经过加筋处理后抗压特性有明显改善,对于试验采用的3种筋材,双向土工格栅和三向土工格栅的加筋效果优于土工布;②加筋碎石的无侧限抗压强度随加筋层数的增多或压实度的提高而增长,加筋层数较多且压实度较高时,抗压强度存在峰值;③碎石中粗颗粒含量越高,加筋碎石的无侧限抗压强度越高,加筋效果越明显。

In order to promote the application of geosynthetic reinforced macadam in high-grade pavement structure.Three kinds of reinforced materials(geotextile,two-way geogrid,three-way geogrid)and two kinds of graded crushed stone were used to design different schemes of reinforced complex in the tests.Based on the analysis of the test results,some main conclusions are drawn as follows.①After reinforcement treatment,the compressive properties of crushed stone are significantly improved,and the reinforcement effect of geogrid is superior to that of geotextile;②The unconfined compressive strength of reinforced crushed stone increases with the increase of the number of reinforcement layers or the compaction degree,and the compressive strength has a peak value when the number of reinforcement layers is large and the compaction degree is high;③The more coarse particles,the greater the unconfined compressive strength of reinforced crushed stone,and the more obvious the effect of reinforcement.