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为探讨天津滨海新区典型结构性软土的动力特性,采用动三轴试验和压汞试验,对交通荷载作用下结构性软土微观结构变化进行了研究。取原状土和动荷载作用后的土样进行压汞测试,用分形理论对压汞测试数据进行分析,探讨孔隙分布特征,提出孔径划分的方法,给出了卓越频率与土体孔隙变化的规律。研究结果表明:在动荷载作用后,天津滨海新区典型软土的孔隙分布发生改变,可分为3种类型;利用Menger海绵模型研究交通荷载作用下结构性软土的孔隙分布特性是可行的;用孔隙分维数可实现对卓越频率的预测以及路基土体变形行为的机制分析。
In order to discuss the dynamic characteristics of typical structural soft soil in Tianjin Binhai New Area, the dynamic triaxial test and mercury intrusion test were used to study the microstructure changes of structural soft soil under traffic load. Mercury loading test was carried out on the soil samples with undisturbed soil and dynamic load. Fractal theory was used to analyze the mercury intrusion test data. The characteristics of pore distribution were discussed. The method of dividing the pore diameter was proposed. The rules of the excellent frequency and soil pore volume change were given . The results show that after dynamic loading, the pore distribution of typical soft soils in Tianjin Binhai New Area is changed and can be divided into three types. Using Menger sponge model to study the pore distribution characteristics of structural soft soils under traffic load is feasible. The fractal dimension of pores can be used to predict the excellent frequency and analyze the mechanism of subgrade deformation.