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根据水田耕作力学理论,切变速率对土壤的剪切破坏的影响是不可忽视的。据此,我们用旋转粘度计对湖北省的三种水田土壤作了纯剪切试验。试验表明,含水量在35～60％范围内,水田泥为“施维道夫体”,切应力与切变速率近似为线性关系。本文应用流变理论及从土壤结构特点对试验结果进行了分析,并分析了含水量对水田土壤力学特性的影响,给出了切应力——切变速率——含水量的三维图。
According to paddy farming theory, the effect of shear rate on soil shear failure can not be neglected. Based on this, we made pure shear tests on three paddy soils in Hubei Province using a rotational viscometer. The experiment shows that the water content is in the range of 35-60%, the paddy soil is “Shiweidofu”, and the shear stress is approximately linear with the shear rate. In this paper, the rheological theory is used to analyze the experimental results from soil structure characteristics. The effect of water content on the soil mechanical properties is also analyzed. The three-dimensional map of shear stress-shear rate-water content is given.