双向土工格栅加筋水稳碎石力学特性试验研究

Experimental Research on Mechanical Properties of Cement Stabilized Macadam Reinforced by Bidirectional Geogrid

文中通过对水泥稳定碎石试件进行无侧限抗压强度试验、弯拉强度试验、干缩试验及温缩试验,研究双向土工格栅设置于水稳碎石中的力学特性.结果表明:双向土工格栅加筋作用可以提高水泥稳定碎石的无侧限抗压强度和弯拉强度,降低干缩系数和温缩系数.同时,水泥稳定碎石抗弯拉强度试验中小梁试件加筋前后裂缝扩展变化规律表明:双向土工格栅加筋作用能有效改变试件内部的应力分布状态.双向土工格栅应用于水泥稳定碎石材料中能有效提高其抗裂性和抗变形能力,预防路面裂缝产生.

In this paper,unconfined compressive strength test,flexural-tensile strength test,dry shrinkage test and temperature shrinkage test were carried out on cement stabilized macadam specimens to study the mechanical characteristics of bidirectional geogrid installed in water stabilized macadam.The results show that bidirectional geogrid reinforcement can improve the unconfined compressive strength and flexural-tensile strength of cement stabilized macadam,and reduce the dry shrinkage coefficient and temperature shrinkage coefficient.Meanwhile,in the flexural-tensile strength test of cement stabilized macadam,the law of crack propagation before and after reinforcement shows that bidirectional geogrid reinforcement can effectively change the stress distribution in the specimen.Therefore,the application of bidirectional geogrid in cement stabilized macadam can effectively improve its crack resistance and deformation resistance,and prevent pavement cracks.