高庙子膨润土悬浮液的抗冲蚀流变特性

发布时间：2018-04-04 12:11

本文选题：膨润土　切入点：冲蚀　出处：《同济大学学报(自然科学版)》2017年03期

【摘要】：采用流变仪对高庙子膨润土悬浮液在不同水固比、掺加盐溶液类型及浓度的条件下的抗冲蚀流变特性进行了研究,得到了各种情况下膨润土悬浮液的屈服应力,再结合Stoke公式计算了引起膨润土悬浮液冲蚀的初始水流速度.研究表明:随着水固比的增加,膨润土流变曲线逐渐下移;对于水固比小于5.0的膨润土悬浮液,当剪切速率较小时呈现假塑性流体特征,而当剪切速率达到一定值时,流变曲线斜率趋于定值;对于水固比大于5.0的膨润土悬浮液,则始终表现为假塑性流体特征,且随着水固比的增大,膨润土悬浮液牛顿流体特征逐渐增强;随着NaCl浓度的增加,膨润土悬浮液屈服应力先减小后增大,而随着CaCl2浓度的增加,膨润土悬浮液屈服应力则不断减小;引起膨润土悬浮液发生冲蚀破坏所需的最低水流速度在10-4~10~(-2)m·s~(-1)范围内.
[Abstract]:In this paper, the rheological properties of high bentonite suspension under different water / solid ratio, type and concentration of salt solution were studied by rheometer, and the yield stress of bentonite suspension under various conditions was obtained.The initial flow velocity caused by the erosion of bentonite suspension was calculated with Stoke formula.The results show that the rheological curve of bentonite gradually decreases with the increase of water / solid ratio, and for bentonite suspensions with water / solid ratio less than 5.0, the shear rate is pseudoplastic fluid when the shear rate is small, and when the shear rate reaches a certain value,The slope of rheological curve tends to be constant, and for bentonite suspensions with water-solid ratio greater than 5.0, the characteristics of pseudoplastic fluid always appear, and with the increase of water-solid ratio, the Newtonian fluid characteristics of bentonite suspensions increase gradually, and with the increase of NaCl concentration,The yield stress of bentonite suspension decreases first and then increases, but with the increase of CaCl2 concentration, the yield stress of bentonite suspension decreases continuously, and the minimum flow velocity required to cause erosion failure of bentonite suspension is in the range of 10-4 ~ (10) ~ (10 ~ (10)) ~ (-2) m ~ (-1) 路m ~ (-1).
【作者单位】：同济大学岩土及地下工程教育部重点实验室;
【基金】：国家自然科学基金(41372270)
【分类号】：TU443

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