加筋含细粒土砂的大型三轴试验分析

Research for reinforced fine-grained sand based on large-scale triaxial tests

为研究在不同加筋情况下土工格栅加筋土的力学特征及加筋效果进行大型三轴实验。首先进行土工实验确定土壤参数及最佳含水率,然后进行大型三轴实验以确定在不同加筋及围压条件下加筋土的性质变化。根据实验结果分析得知,土的性质随加筋情况和围压的变化表现出一定的规律特征,可利用Duncan-Chang模型参数对加筋效果进行定量分析。试验结果表明:加筋后土体的强度明显增强;对加筋效果系数和强度参数分析发现,随着围压的增加加筋效果系数会降低;土工格栅加筋主要提高了土体的黏聚力。

In order to study the variation law of the strength and reinforcement effect of the geogrid reinforced soil under different reinforced conditions,the triaxial test were carried out for fine-grained sand.Firstly,geotechnical experiments were carried out to determine the parameters of soils and the optimum water content.Secondly,tests were carried out under different conditions to obtain mechanical properties of reinforced soil.According to the experimental results,it was found that the mechanical properties of reinforced soil showed certain regular characteristics with the changes of reinforced conditions and confining pressure.The Duncan-Chang model parameters can be used in numerical analysis of the reinforcement effect.The results show that:The strengths of the geogrid reinforced soil are improved obviously;the coefficient of reinforcement effect reduces with the increase in confining pressure;the strength for geogrid reinforced soil is improved by increasing the cohesion of soil.