## 3 Results and Discussion  
### Effect of Composite Dust Suppressant Concentration on the Bearing Capacity of Solidified Soil  
The compressive strength of the three molded specimens cured naturally for seven days under different dust suppressant dilutions was measured, yielding the stress-strain curves depicted in Figure 2. Based on the data presented in Figure 2, the effects of the composite dust suppressant on the compressive strength of the soil after consolidation vary according to its dilution.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
\begin{tabular}{c} Erosion by blower \\ (simulating an Level \\ 11 wind) \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}
Table 4: Wind erosion resistance test group No.  
Figure 2: Axial stress of A1, A2, and A3 after 7 days of curing.  
The ultimate compressive strength of the consolidated soil treated with a 10-fold diluted dust suppressant was slightly higher than that of the undiluted suppressant. Specifically, the ultimate compressive strength of the 10-fold diluted sample (A2) was 118.1 kPa higher than that of the undiluted sample (A1). This enhancement can be attributed to the increased water content in the diluted solution, which allowed for more uniform coverage of soil particles and penetration into the interstices between them. The lubricating effect of this water aided in the rearrangement and close contact of soil particles, resulting in a smoother and flatter soil surface [27]. This smoother surface reduced friction and resistance between soil particles, facilitating the formation of a more uniform and dense consolidation layer that was better able to resist external pressure.  
The ultimate compressive strength of the consolidated soil treated with the undiluted dust suppressant was much higher than that of the 20-fold diluted sample. Specifically, the strength of the undiluted sample (A1) was 664.23 kPa greater than that of the 20-fold diluted sample (A3). This is because the higher binder concentration in the undiluted suppressant allowed for more binder molecules to interact with the soil particles, forming stronger bonds and facilitating the consolidation of larger soil particle structures, thereby enhancing the soil's ultimate compressive strength.  
The consolidated soil treated with the 10-fold and 20-fold diluted dust suppressants exhibited plastic failure, whereas the undiluted sample showed brittle failure. The stress-strain curves of the 10-fold (A2) and 20-fold diluted samples (A3) indicated that as the strain increased, stress did not decrease abruptly, indicating plastic failure. In contrast, the stress-strain curve of the undiluted sample (A1) showed a rapid failure at a stress of 816.8 kPa, with a sharp stress drop and no necking phenomenon, indicative of brittle failure. This brittle failure can be attributed to the high concentration of binder in the undiluted suppressant, which creates a strong bonding force on the soil surface but may not penetrate deeply into the soil, leading to internal defects and cracks that weaken the soil's overall strength.  
The optimal dilution ratio for the composite dust suppressant was determined to be 10 times. This dilution not only reduces the usage cost but also ensures effective soil consolidation. A comparative analysis revealed that the ultimate compressive strength of the consolidated soil treated with the 10-fold diluted suppressant (A2) was the highest among the three groups, while that of the 20-fold diluted sample (A3) was significantly lower at 152.57 kPa. Excessive dilution of the dust suppressant can impair soil consolidation performance and reduce its dust suppression effectiveness due to the dilution of active ingredients, highlighting the importance of maintaining an appropriate dilution ratio.  
In summary, diluting the composite dust suppressant 10 times before application not only significantly enhances soil compressive strength and toughness but also reduces costs, representing a more economical and efficient method for dust suppression and soil consolidation.