冻融循环下玄武岩纤维-水泥改良土静力学特性研究

Study on static properties of basalt fiber cement modified soil under freeze-thaw cycling

以吉林省北部粉砂土为研究对象,通过静三轴试验探究了冻融循环条件下玄武岩纤维-水泥改良土的静力学特性。玄武岩纤维-水泥改良土的内摩擦角和抗剪强度增大、黏聚力变化幅度较小,弹性模量在冻融循环4~6次时增幅最大。试验表明通过玄武岩纤维-水泥改良,可以提升粉砂土的抗冻性、耐久性,且玄武岩纤维掺量0.3%+水泥掺量2%效果最佳。

The static triaxial test was conducted to investigate the static properties of basalt fiber cement modified soil under freeze-thaw cycles,taking the silty soil in northern Jilin Province as the research object.The internal friction angle and shear strength of basalt fiber cement modified soil increase,while the cohesion changes slightly.The elastic modulus increases most during 4~6 freeze-thaw cycles.The test shows that the frost resistance and durability of silty sand can be improved through basalt fiber cement improvement,and the best effect is to add 0.3%basalt fiber and 2%cement.