黏土矿物对泥石流体屈服应力影响的实验研究

一般情况下,泥石流体屈服应力随着泥沙颗粒体积浓度的增大而增大,同时随着黏粒黏性的增强而增强。在此研究基础上,以泥石流体屈服应力为研究目标,选取了蒙脱石、伊利石、绿泥石、高岭土等4种常见的黏土矿物为研究对象,通过改变泥石流体中泥沙颗粒体积浓度、黏土矿物成分及黏粒重量百分含量得出:1一般情况下,黏土成份对泥石流体屈服应力影响的强弱关系依次为蒙脱石伊利石绿泥石高岭土。2泥沙颗粒体积浓度和黏粒百分含量对泥石流体屈服应力的影响呈指数关系。3综合分析泥沙颗粒体积浓度、黏土矿物成份、黏粒百分含量与屈服应力的关系后获得了黏土矿物下屈服应力的关系式。4用野外调查资料验证了上述泥石流屈服应力与泥沙颗粒体积浓度、黏土矿物的关系,具有一定的准确性。

Experimental research on influence of clay minerals on yield stress of debris flow

In general, the yielding stress of debris flow increases with the increase of sediment volumetric concentration and cohesive strength of clayey particles.4 types of clayey minerals (montmorillonite, illite, chlorite, and kaolin) are selected to study the yielding stress of debris flow by changing the sediment volumetric concentration , viscous mineral composition and clay particle weight percentage .The conclusions are:(1) the effects of clayey composition on the yielding stress of debris flow follows an descending order of montmorillonite , illite, chlorite and kaolinite; (2) sediment volumetric concentration and percentage of clayey particles percentage have an exponential relation to the yielding stress of debris flow ;(3) the yielding stress formula is ob-tained by comprehensive analysis of the relationship of sediment volumetric concentration , composition and percentage of clayey particles;(4) field investigation data proved the above mentioned results .