添加沸石对黏性土-膨润土竖向隔离墙材料压缩和渗透特性的影响

发布时间：2018-05-09 09:13

本文选题：沸石 + 膨润土　；参考：《岩土力学》2014年S2期

【摘要】：土-膨润土系竖向隔离墙广泛应用于工业污染场地和地下水修复工程。通过坍落度和一维压缩固结试验研究添加沸石对黏性土-膨润土竖向隔离墙材料的工作性,以及压缩和渗透特性。黏性土选用高岭土,沸石-高岭土-膨润土试样中沸石掺量为2%~40%。试验结果与以往沸石-砂-膨润土竖向隔离墙材料以及击实沸石-膨润土混合土研究结果进行对比,明确沸石掺量和粒径对压缩和渗透特性的作用规律。试验结果显示,满足隔离墙材料施工要求的含水率范围随沸石掺量增加而增大,并处于液限的0.96~1.18倍。添加细颗粒沸石对试样的压缩指数和渗透系数影响较小,渗透系数小于10-9m/s。相反,添加粗颗粒沸石将导致微孔隙尺寸增大,并形成水能够通过的沸石网架结构,将显著增大渗透系数。试样渗透系数能够通过考虑孔隙比和液限的经验公式进行良好的预测。
[Abstract]:The vertical wall of soil-bentonite system is widely used in industrial pollution sites and groundwater remediation projects. The workability, compressibility and permeability of clay bentonite vertical wall materials were studied by slump and one-dimensional compression consolidation tests. Kaolinite is chosen as clay, and zeolite in zeolite-kaolin-bentonite sample is 20%. The experimental results are compared with the results of previous studies on the vertical separation wall materials of zeolite sand bentonite and compacted zeolite-bentonite mixed soil to clarify the effect of zeolite content and particle size on compression and permeability characteristics. The experimental results show that the range of moisture content that meets the construction requirements of the wall material increases with the increase of zeolite content and is 0.96 ~ 1.18 times of the liquid limit. The addition of fine zeolite has little effect on the compression index and permeability coefficient of the sample, and the permeability coefficient is less than 10 ~ (-9) m / s. On the contrary, the addition of coarse-grained zeolites will result in the increase of the pore size and the formation of the lattice structure through which water can pass, which will increase the permeability coefficient significantly. The permeability coefficient of the sample can be well predicted by the empirical formula considering the void ratio and liquid limit.
【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(No.51278100,No.41330641,41472258) 江苏省自然科学基金项目(No.BK2012022) 东南大学优秀博士学位论文基金(No.YBJJ1343)
【分类号】：TU476;TU521

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