玄武岩纤维和纳米二氧化硅加筋上海黏土的抗剪强度试验研究

为了了解玄武岩纤维和纳米二氧化硅加筋土的剪切强度特性,采用玄武岩纤维和纳米二氧化硅作为加筋材料以单掺或复掺形式掺入上海黏土,进行直剪试验,通过改变二者加筋率研究这二者对上海黏土的抗剪强度的影响。试验表明:玄武岩纤维可以有效提高上海黏土的抗剪强度,质量加筋率为0.5%时效果最佳;纳米二氧化硅也能提高上海黏土的抗剪强度,质量加筋率为1.0%时效果最好;同时加入玄武岩纤维和纳米二氧化硅能进一步提升土的抗剪强度,0.5%玄武岩纤维和1.0%纳米二氧化硅的组合效果最好;加入玄武岩纤维和纳米二氧化硅对土的黏聚力提升较大,内摩擦角提升较小。

Shear strength experimental study on basalt fiber and nano slilca reinforced Shanghai clay

For a more comprehensive study on the shear strength characteristic of basalt fiber and nano silica reinforced clay,the basalt fiber and nano silica were used as reinforcement materials to be incorporated into Shanghai clay in single or mixed form. The direct shear test was carried out to study the influence of the two materials on the shear strength of Shanghai clay by changing the reinforcement ratio of the two materials. The result shows that: the basalt fiber can effectively improve the shear strength of Shanghai clay , when the reinforcement ratio is 0.5%, the reinforcing performance is the most efficient; the addition of nano silica to Shanghai clay also increases the shear strength, and 1.0% is the best reinforced ratio; the shear strength of fiber-nano silica reinforced clay rise significantly under severe conditions (reinforcement ratio), the combined effect of the 0.5% basalt fiber(by weight) and 1.0% nano-silica(by weight) is the most effective; mixing basalt fiber with nano silica can obviously enlarge clay''s cohesion, however the angle of internal friction was slightly influenced.