基于邓肯-张模型的低液限粉质黏土-砂的强度规律

目前研究中着重研究单一类型土体的力学特性,忽略了对各类型土体共存条件下的相互作用,各类土体间协调性研究仍有较大空白.根据现场实际工程状况以及对低液限粉质黏土-砂地层的研究需要,通过标准三轴实验研究低液限粉质黏土和砂大量共存地层含砂率和含水率因素对该地层强度变化的作用规律以及邓肯-张模型的适用性.试验研究表明:与粉质黏土层相比,低液限粉质黏土-砂层土体强度较小;低液限粉质黏土-砂层中含砂率对土体强度的影响存在明显的分界;低液限粉质黏土-砂地层含水率对土体强度的影响与含砂率和地应力有关;低液限粉质黏土-砂层较好地符合邓肯-张双曲线增量弹性模型.

The strength law of the low liquid limit silty clay-sand based on Duncan-Chang model

At present, the mechanical properties of a single type of soil are focused on in the studies, but the interaction between different types of soil under the condition of coexistence is ignored, and the study on the coordination between different types of soil still has a big gap. According to the needs of the actual engineering situation on site and to study the low liquid limit silty clay-sand strata, the standard triaxial experiment was used to study, in the coexistence of a large number of low liquid limit silty clay and sand strata, the effect of sand content and water content factors on the change of the strength of the strata, and the applicability of Duncan-Chang model. The results show that: compared with silty clay strata, the strength of low liquid limit silty clay-sand strata is smaller; The influence of sand content on soil strength in low liquid limit silty clay-sand strata is obviously divided; The influence of water content of low liquid limit silty clay-sand formation on soil strength is related to sand content and in-situ stress; The low liquid limit silty clay-sand strata accords well with Duncan-Chang hyperbola incremental elastic model.