循环荷载下砂质混合土孔隙水压力特性研究

Study on excess pore water pressures of sands mixed with clays under cyclic loading

通过对各种细颗粒含量的土实施从小到大应变水平的动力循环荷载试验,采用累积损失能量的观点,分别考察了土的细颗粒成分含量、围压、加载频率、加载形式及荷载的不规则性对孔压的影响,提出了孔隙水压力和累积损失能量的归一化方法,建立了砂质混合土的孔隙水压力上升模型,并探讨了模型参数和土的细颗粒成分含量的关系。

Dynamic cyclic loading tests of the soils with va rious fine content are carried out with different strain level from low to high. Based on t he viewpoint of total energy dissipation, the effects of the following factors o n the excess pore water p ressure are studied:fine content,confining pressure, loading frequency, loading s tep and irregularity of loading. A normalization method is put forward for the e xc ess pore water pressure and total energy dissipation. An excess pore water p ressure rising model is established for the sandy clay. Relationships between mo del parameters and fine content of soil are discussed finally.