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纳米膨润土是一种新型的土体加固材料,能有效提高土体的物理力学性质。掌握纳米膨润土加固土体的特性对于该技术的推广应用具有重要的意义。本文开展了10组无侧限抗压强度试验,研究了掺加纳米膨润土后黏土土样的力学性质,以及纳米膨润土掺量、土的含水率和干密度三个因素对土体无侧限抗压强度的影响。结果表明,纳米膨润土的掺加能有效提高黏土的抗压性能,且抗压强度随纳米膨润土掺量、土干密度的增加呈非线性增加;随土含水率的增加,抗压强度先减少后增加。黏土内掺入纳米膨润土后,由于土的孔隙会被填充,形成密集结构,纳米膨润土-黏土颗粒界面的有效接触面积增加,使黏土体的强度显著增加。同时,水分会在纳米膨润土-黏土界面起到润滑作用。本研究表明,这一土体加固技术能有效提高地基土的承载力和变形性能,因此具有巨大的应用潜力。
Nanometer bentonite is a new type of soil reinforcement material, which can effectively improve the physical and mechanical properties of soil. Grasping the characteristics of nano-bentonite reinforced soil is of great significance for the popularization and application of this technology. Ten sets of unconfined compressive strength tests were carried out in this paper. The mechanical properties of clay samples with nanometer bentonite were studied. The effects of three factors including content of nanometer bentonite, water content and dry density of soil on unconfined soil resistance The effect of pressure intensity. The results show that the nano-bentonite can effectively increase the compressive strength of clay, and the compressive strength increases nonlinearly with the increase of nano-bentonite content and dry density. With the increase of soil moisture content, the compressive strength first decreases increase. After the nano-bentonite is incorporated into the clay, the effective contact area of the nano-bentonite-clay particle interface increases due to the filling of the pores in the soil to form a dense structure, thereby significantly increasing the strength of the clay body. At the same time, moisture in the nano-bentonite - clay interface play a role in lubrication. This study shows that this soil reinforcement technology can effectively improve the bearing capacity and deformation performance of foundation soil, so it has great potential for application.