Zhang Zhengrui, Matlan Siti Jahara, Wang Hao, Pishro Ahad Amini, Zhang Lili, Gao Xian, Liang Zhao, Liu Xiaoyi, Zhao Peigen
Civil Engineering Programme, Faculty of Engineering, University of Malaysia Sabah, Kota Kinabalu 88400, Sabah, Malaysia.
College of Civil Engineering, Sichuan University of Science & Engineering, Zigong 643000, China.
Materials (Basel). 2022 Jul 18;15(14):4982. doi: 10.3390/ma15144982.
This paper studied the anti-seepage ability of the modified loess by using attapulgite, which is abundant in local areas. The possibility of using the modified loess as the sustainable compacted soil liner material in a solid waste landfill was also considered in this research. The materials were then evaluated using Nuclear Magnetic Resonance (NMR), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and an Impermeability Mechanism (IM). The experimental results showed that the permeability coefficient of the attapulgite-modified loess decreases significantly with increasing attapulgite content. However, it becomes less significant when the attapulgite level approaches 10%. Both cases can meet the landfill impermeability requirements, based on the attapulgite content remaining at 10%, adding 15% lime or 5% cement, respectively. The triaxial consolidation and drainage experiment was carried out to investigate the shear strength of the materials under three different working circumstances. The stress-strain curves of each specimen were produced, as were the cohesion and internal friction angle values. This research lays the groundwork for using attapulgite-modified loess as a landfill lining material. It establishes a solid platform for future studies on attapulgite adsorption and purifying performance in landfills.
本文研究了利用当地储量丰富的凹凸棒土对黄土进行改性后的抗渗能力。本研究还考虑了将改性黄土用作固体废物填埋场可持续压实土壤衬垫材料的可能性。然后，使用核磁共振（NMR）、扫描电子显微镜（SEM）、X射线衍射（XRD）和防渗机理（IM）对材料进行评估。实验结果表明，随着凹凸棒土含量的增加，凹凸棒土改性黄土的渗透系数显著降低。然而，当凹凸棒土含量接近10%时，这种降低变得不那么显著。在凹凸棒土含量保持在10%的基础上，分别添加15%的石灰或5%的水泥，这两种情况都能满足填埋场防渗要求。进行了三轴固结排水试验，以研究材料在三种不同工作条件下的抗剪强度。绘制了每个试样的应力-应变曲线以及黏聚力和内摩擦角值。本研究为将凹凸棒土改性黄土用作填埋场衬垫材料奠定了基础。它为未来关于凹凸棒土在填埋场中的吸附和净化性能的研究建立了坚实的平台。
