Abstract
As a new soil improvement method, adding nano-bentonite can enhance the engineering properties of soil. To study the stabilization effect of nano-bentonite on soil consolidation properties, a series of one-dimensional odometer tests were conducted on a clayey soil with different nano-bentonite mixing contents (i.e., 0.5%, 1%, 1.5%, and 2%). The effects of nano-bentonite on the coefficient of consolidation and permeability of the test soil were analyzed. The results show that adding a certain amount of nano-bentonite does not significantly affect the original consolidation characteristics of soil samples, but displays a notable effect on accelerating water drainage. Among all the soil samples, when the nano-bentonite mixing content is 0.5%, the final compression amount is the largest and the final void ratio is the smallest. The coefficients of consolidation and permeability increase with increasing nano-bentonite mixing content under high stress state. The test results indicate that nano-bentonite can facilitate internal cementation of soil particles, which effectively reduces the compressibility of clayey soil.
Highlights
Natural clayey soils rarely meet the requirements of modern geotechnical engineering projects in terms of bearing capacity of their foundations
The above research results mainly focus on the contribution of nanomaterials to the improvement of soil strength, whereas studies of the consolidation, permeability, compression, and other characteristics of soil mixed with nanomaterials are lacking, and their action mechanisms are not clear
The results show that the coefficient of consolidation of the soil sample decreases sharply
Summary
Natural clayey soils rarely meet the requirements of modern geotechnical engineering projects in terms of bearing capacity of their foundations. The above research results mainly focus on the contribution of nanomaterials to the improvement of soil strength, whereas studies of the consolidation, permeability, compression, and other characteristics of soil mixed with nanomaterials are lacking, and their action mechanisms are not clear. Ng et al studied the change in the permeability of clay after adding different amounts of nano-oxides (two different nanomaterials namely gamma-aluminum oxide powder (γ-Al2O3) and nano-copper oxide (CuO) were selected and mixed with clay at different percentages (i.e., 2%, 4%, and 6%)) [27] They found that with the increase in nano-oxides content, the void of clay was filled with nanomaterials and the permeability coefficient decreased. XX--rraayy DDiiffffrraaccttiioonn rreessuullttss ooff tthhee tteesstt ssooiill. In the step study, the influence of curing time on the strength of soil samples will be systematically analyzed
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