Experimental Investigation on Reinforcement Application of Newly Permeable Polymers in Dam Engineering with Fine Sand Layers

Abstract

The grinding reinforcement of fine sand layers is a difficult problem in dam engineering construction. As a new type of grouting material, permeable polymer with excellent impermeability and high strength is widely used in dam engineering. In this paper, a series of compressive tests were designed considering different grouting pressures, curing days, moisture content, and porosity of fine sand. The influence of grouting parameters and sand layer conditions on the strength of fine sand layers reinforced by permeable polymers was analyzed. SEM and XDR tests were conducted to analyze the microscopic characteristics of the grouting stone. The functional calculation model of the strength and the influencing factors was established to explore the main factors influencing grouting stones. The compressive strength of grouted stones increases rapidly from the 7th to the 14th day, reaching about 96% of the maximum strength. The degree of influence of different factors is grouting pressure > moisture content > porosity. The compressive strength of the grouted stones increases with the increase of grouting pressure and the number of curing days. The compressive strength decreases with the sand layer’s increasing moisture content and porosity.

Experimental Study on Grout–Soil Interaction Effects in Sandy Soil under Different Water-to-Cement Ratios

“…It is evident that compaction grouting was the primary diffusion pattern between the grout and the soil, as demonstrated by the composition of the grout-solidified body in Section 4.1. The probable reasons for the decrease in grouting pressure were as follows: (1) The presence of a weak structure within the soil during grouting led to the slurry entering the weak structure while diffusing, which resulted in a reduction in the force exerted on the soil, a decrease in grouting pressure, and a plateau period in surface displacement. (2) Following the previous phase of grouting, the slurry continued to exert pressure on the adjacent soil.…”

“…Grouting is a cost-effective geotechnical engineering technique that has been extensively applied and developed in the field of foundation treatment in recent decades. It is one of the most commonly used methods in the reinforcement of sandy soil foundations, which and can effectively enhance the mechanical properties and waterproofing performance of sandy soil foundations [1][2][3][4].…”