粒度与含水率对泥沙流变特性影响的试验研究

来源 :泥沙研究 | 被引量 : 0次 | 上传用户:zzx2324
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以不同均匀粒度高岭土泥沙为研究对象,采用安东帕MCR302流变仪,运用控制剪切速率实验方法,系统地研究了泥沙的粒度、含水率等物理参数对其流变特性的影响.结果 表明:高岭土泥沙具有明显的宾汉体特征,可采用宾汉模型拟合得到屈服应力;剪切应力随粒径的增大呈现先增大后减小的变化趋势,转折区间为54~74 μm;含水率变化对泥沙的流变特性影响较大,在实验中含水率增大10%剪切应力减小量达到90%,且发现含水率与泥沙屈服应力之间呈现幂律关系;当粒度在10~116μm之间,含水率在30%~45%范围内,泥沙屈服应力存在上下边界.根据屈服应力与密度关系计算获得临界起动应力值和含水率与起动应力值之间的关系.
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