An Experimental Study on the Reinforcement of Silt with Permeable Polyurethane by Penetration Grouting

Abstract

To meet the demand of antiseepage and reinforcement of soil dams, a kind of permeable polyurethane grouting material was developed. A visual steady-pressure grouting test device was designed to study the law of polyurethane diffusion and reinforcement in silt under different pressure, and the interaction mechanism of grout and soil body structure was explored microscopically. The results showed that, with the increase in the grouting pressure, the diffusion speed rose, and the diffusion pattern of grout in the soil also changed from permeation diffusion to permeation splitting. Under the effect of grouting pressure, more tiny cracks will occur in the soil structure, leading to the use of more grout, thus increasing the strength of the consolidated soil by more than 10 times. The results of SEM-EDS and mercury intrusion test proved that the polyurethane had a significant filling effect on the soil structure, which could effectively reduce the porosity of the soil and cement the soil particles through wrapping, complexing, and hydrogen bonding, thereby improving the soil properties. Moreover, the results revealed from a microscopic perspective that the grouting altered the pore structure of the soil structure through the seepage-erosion-splitting coupling effect, but when the grouting pressure exceeded 0.4 MPa, the soil particle and grout would be partially remixed and arranged closely, showing a phenomenon of jet grouting. Finally, the material was used in engineering practice, achieving a satisfactory grouting treatment effect.

Chemical improvement of soluble rocks: Foundation of Mosul Dam as case study

“…Several studies [32][33][34][35][36][37] have investigated different aspects of PU such as, its durability, tensile properties, mechanical properties, and toxicity.…”

Investigation of the Effect of Graphene Oxide on the Properties and Microstructure of Clay-Cement Composite Grouting Materials

“…At present, grouting materials mainly include cement, cement-water glass, clay–cement, chemical grouting materials and resins, etc. [ 6 , 7 , 8 , 9 ]. Among them, clay–cement grouting materials have good application value due to their low cost, good stability and strong anti-permeability [ 8 , 10 ].…”

Damage Characteristics of Polymer Plates under the Impact of the Near‐Field and Contact Underwater Explosion

“…Guo et al [12] conducted field test research on the diffusion characteristics of expansive polymer materials in soil and found that the polymer developed flaky fracture diffusion in soil and finally formed a wedge-shaped section in the cracks. Wang et al [13] studied the diffusion and reinforcement law of polymers in silt under different pressures and found that polymers can effectively reduce the porosity of soil to improve the properties of soil. Valentino et al [14] studied the mechanical properties of two different types of polyurethane through experiments and found that the higher the restraint stress in the expansion stage of polyurethane, the higher the density after hardening.…”