改良钙基膨润土在竖向隔离墙中的应用

发布时间：2018-03-09 14:43

本文选题：隔离墙　切入点：六偏磷酸钠　出处：《东南大学学报(自然科学版)》2016年S1期 　论文类型：期刊论文

【摘要】：为提高钙基膨润土作为竖向隔离墙泥浆材料的适用性,对添加不同六偏磷酸钠掺量的泥浆进行了马氏黏度、泥浆密度、滤失量和pH试验,研究不同磷酸盐和膨润土掺量下泥浆的工程特性变化规律.试验结果表明,马氏黏度和泥浆密度随磷酸盐和膨润土掺量增加表现出不同程度增加;相反,滤失量和pH值随磷酸盐和膨润土掺量增加呈不同程度降低.其中,受泥浆较高钙基膨润土掺量影响,传统钠基膨润土泥浆密度要求或不适用于钙基膨润土情况.所有膨润土掺量下的素土泥浆均不满足隔离墙泥浆滤失量要求,六偏磷酸钠对提高泥浆工程特性起积极作用.含20%膨润土掺量的2 SHMP-CaB泥浆满足工程指标要求,同时具有较低磷酸盐消耗量,因而考虑其作为优选泥浆;建议改良钙基膨润土最优六偏磷酸钠掺量为2%.
[Abstract]:In order to improve the applicability of calcium based bentonite as the material of vertical wall mud, the mud with different content of sodium hexametaphosphate was tested with Markov viscosity, mud density, filtrate loss and pH value. The experimental results show that the Markov viscosity and mud density increase in varying degrees with the increase of phosphate and bentonite content; on the contrary, when the amount of phosphate and bentonite is increased, The filtrate loss and pH value decreased with the increase of phosphate and bentonite content. Traditional sodium-bentonite mud density requirements or not suitable for calcium bentonite conditions. All bentonite content of plain mud does not meet the separation wall mud filtration requirements, Sodium hexametaphosphate plays an active role in improving the engineering characteristics of the mud. The 2 SHMP-CaB mud containing 20% bentonite content meets the engineering requirements and has a low phosphate consumption, so it is considered as the optimal slurry. It is suggested that the optimum content of sodium hexametaphosphate for modified calcium bentonite is 2%.
【作者单位】：东南大学岩土工程研究所;
【基金】：国家自然科学基金重点资助项目(41330641);国家自然科学基金资助项目(51278100,41472258) 江苏省自然科学基金杰出青年基金资助项目(BK2012022)
【分类号】：X505

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