## 3 Results
### Effect of Curing Time, Fiber Length, and Fiber Amount on Strength  
The stress-strain curves for the specimens of FCSSC were obtained from the UCT results, encompassing conditions of varying fiber lengths and amounts. The pinnacle stress, indicative of the unconfined compressive strength, was extracted from these curves to quantify the static properties of the sample. These results are visually represented in Figure 5. Specifically, Figure 5a-c illustrate the significant impact of curing time, fiber content, and fiber length on the results of compressive strength testing. Table 6 presents a comprehensive overview of the uniaxial compression test results and the percentage growth in unconfined compressive strength. With the extension of curing time, there  
Figure 4: Fracture morphology of the soil specimens: (**a**) initial phase, (**b**) damage phase, and (**c**) destruction state. Figure 3: Stress-strain curves of the stabilized soft clay reinforced by fibers with different lengths: (**a**) \(L=5\) mm, (**b**) \(L=10\) mm, and (**c**) \(L=15\). is a continuous increase in compressive strength observed across diverse groups of the FCSSC samples. The growth rate of the strength exhibits a higher value within the initial 1-7 days of curing, eventually stabilizing during the subsequent 7-14 days. In summary, the compressive strength of the cured samples demonstrates a higher magnitude in the early stages, reaching a peak at a curing age of 7 days. This experimental observation aligns with previous studies focusing on cement-based fiber-modified materials. Under varying curing ages, the strength of FCSSC exhibits an initial increase followed by a decline with the rise in fiber content. The pivotal point for changes in the compressive strength of these specimens of FCSSC is found at amounts in the range of 0.3-0.4%. Notably, the length of the fibers plays a crucial role in influencing compressive strength, with short-cut fibers providing the most effective reinforcement. This effectiveness is attributed to the glass fiber monofilaments with a length of 5 mm (short-cut fibers) possessing the largest ratio of length to diameter. This characteristic ensures optimal contact with the hydration gel product and provides the ability to withstand greater compressive stress. The destruction of the sample is accompanied by the transfer and conversion of energy, and the emergence of failure cracks results from the accumulation and subsequent release of surface energy. The severity of fracturing damage correlates with the higher surface energy generated during compression failure. In samples without a fiber addition, cracks persistently expand under the load, concurrently enlarging the fracturing damage zone. As the fiber content increases, the intensity of compression damage to the FCSSC sample diminishes. However, excessive fiber length tends to counteract this, leading to poor deformation resistance in specific areas, consequently impacting the reinforcing effect. The reinforcing effect of the fibers on the stabilized soft clay experiences an initial ascent followed by a decline with increases in fiber content, indicating that an excessive addition of fibers may yield diminishing returns. In comparison to the UCS values of the reference group, the maximum increase in compressive strength for the short-cut, medium-cut, and long-cut fiber-reinforced samples was achieved at fiber contents between 0.3% and 0.4%, showing values of 88.3%, 70.9%, and 77.1%, respectively. The addition of fibers promotes the formation of a three-dimensional network within the sample, amplifying adhesion and mechanical interlocking forces between the sand particles and hydration products, contributing to improving the load bearing capacity. Notably, at low fiber \begin{table}
\begin{tabular}{c c c} \hline \hline
**Fiber Content (\%)** & **a** & **b** \\ \hline
0 & 1.895 & 0.671 \\
0.1 & 1.901 & 0.543 \\
0.2 & 2.231 & 0.488 \\
0.3 & 2.522 & 0.501 \\
0.4 & 2.813 & 0.613 \\
0.5 & 2.864 & 0.726 \\ \hline \hline \end{tabular}
\end{table}