عنوان مقاله [English]
In urban areas, particularly in the metropolis of Mashhad, regarding the placement of large areas on fine-grained sediments and problematical and weak soil, the presentation of new technologies to avoid asymmetric subsidence is of particular importance. In this regard, regarding the need to build high-rise structures and environmental problems, using nanotechnology in soil improvement is a good alternative to traditional methods such as stone columns, under-pressure injection of cement or lime, piles, and deep foundation, etc. Nanotechnology, due to the significant increase in particle surface area, is associated with a significant impact on improving soil strength and mechanical parameters. In the current study, the effect of adding montmorillonite nanoclay and S-type nanosilica on the strength and mechanical parameters of fine-grained soil around the holy shrine of Razavi in Mashhad in weight ratios of 0.1, 0.5, 1, 2.5 and 5 of nanoclay and 0.15, 0.25, 0.5, 0.75 and 1 of nanosilica were evaluated and compared via laboratory studies. The results reveal a significant increase in shear and compressive strength parameters, as well as a decrease in soil settling in nanosilica, improved samples compared to nanosilica, improved samples so that the addition of 1% nanosilica and 2.5% nanoclay increases silty-clay soil bearing capacity up to 620 and 134%, respectively. It should be mentioned that due to the low swelling index of this soil, the addition of these nanoparticles is not associated with a change in the swelling index of the study area soil.