## 3 Analysis and Discussion of Test Results
### Analysis of Disintegration Test Results  
The change in disintegration form is the most noticeable indication of the disintegration of solidified soil. As shown in Figure 9, the remolded loess disintegrates after 28 days of curing, which can be roughly divided into three stages. The first stage is the water absorption and exhaust stage. During this stage, air trapped in the particle pores is released into the water, resulting in the formation of pore water. The most noticeable manifestation of this stage is the upward escape of bubbles on the outer surface of the specimen. The second stage is the disintegration stage. The water on the specimen's surface becomes turbid, and due to concentrated stress, spalling initially occurs at the edges of the soil. As the moisture content gradually increases and the soil becomes saturated, the internal friction angle and cohesion decrease, leading to widespread disintegration of the soil from the specimen's surface to its interior, causing large-scale peeling. Once the large-scale disintegration ends and the soil reaches an equilibrium state, the disintegration enters the third stage. During this stage, the disintegration rate decreases until it stabilizes, indicating the completion of the disintegration process. Figure 8: Variation of polymer incorporation in unconfined compressive strength of solidified soil. Figure 10 presents the disintegration test curves of loess and solidified soil with varying geopolymer content at different curing ages. The figure demonstrates that the curing period has a notable influence on the disintegration of loess after solidification with geopolymer. On the 7 th day of curing, the geopolymer content had minimal impact on the disintegration of the solidified soil. At 726 s, the remodeled loess had completely disintegrated. The disintegration of the solidified soil was the lowest (86.73%) when the geopolymer content was 25%. As the curing age increased, the addition of geopolymers effectively reduced the disintegration of the solidified soil. The smallest disintegration of the solidified soil (36.02%) was observed at a curing time of 14 days and 1800 s with a 20% geopolymer content. This value was 0.362 and 0.782 times the disintegration of plain soil and 20% geopolymer-solidified soil, respectively. When the curing period reached 28 days, the solidified soil with 20% and 25% geopolymer content exhibited minimal collapse, with disintegration of 1.97% and 4.72%, respectively, at 1800 s. The degree of hydration reaction of the geopolymer increases with the curing age. After 28 days of curing, the gelatinous substance produced by the geopolymer's hydration reaction tightly cements the soil particles, preventing large-scale disintegration in a short period of time. However, when a small amount of geopolymer is added, the solidified soil may partially disintegrate because the cementing material cannot fully cement the soil particles. The disintegration of the solidified soil with 25% geopolymer content is higher than that with 20% geopolymer content. This is because the gelatinous substance resulting from the hydration reaction of the geopolymer partially adheres to the specimen's surface and dissolves in water, leading to the phenomenon of \"disintegration and rise\" in the solidified soil with 25% geopolymer content. Figure 11 shows the disintegration rate curve of loess and solidified soil with varying content of geopolymers at different curing ages. The disintegration rate of solidified soil initially increases and then decreases, eventually stabilizing at the 7 th day of curing. This trend is less influenced by the amount of geopolymer used. The disintegration rate of solidified soil with varying geopolymer content ranged from 3.74 min\({}^{-1}\) to 4.16 min\({}^{-1}\) within the first minute. The disintegration rate of solidified soil reached its peak at approximately the eighth minute, with a maximum value of 11.26 min\({}^{-1}\).