天然泥石流剪切应变特性试验研究

泥石流流变性质与泥石流动力特性密切相关,对泥石流流变的研究是目前地质灾害领域研究的热点之一。采用安东帕第三代Physica MCR301流变仪对粒径在1 mm以下的泥石流堆积扇原样浆体进行测试,通过开展多组试验,研究了泥石流重度、剪切速率、加载方式等因素对泥石流流变性质的影响。结果表明:低重度泥石流体流变曲线呈现对数型关系,高重度泥石流体呈现指数增长关系;同种级配、同种剪切速率下,泥石流剪切应力与加载方式变化不大。

Test study on shear strain characteristics of debris flow

The rheological property of debris flow is closely related to its dynamic characteristics and the study on rheological property is the focus in the geological disaster field. A series of tests on original paste samples, particle diameter smaller than 1 mm, of debris flow fan had been done with third generation Anton Paar rheometer Physica MCR301 and the influences of debris flow gravity, shearing rate, loading mode etc. on the rheological property of debris flow were studied. The study results show that the rheological curve of low gravity debris flow presents a logarithmic relationship and that high gravity debris flow presents expo-nential growth;under the same gravity and shearing rate, the relation of shearing stress and gravity is obtained; the shearing stress of debris flow is not related to the loading mode.