# Experimental Study on Strength of Polypropylene Fiber Reinforced Cemented Silt Soil
## 3 Analysis of Unconfined Compressive Strength and Unconsolidated Underained Test Result  
### Analysis of Unconfined Compressive Strength Results of Fiber Cement Soil  
The UCS test results of fiber cement soil are shown in Table 5. The range calculation of UCS of fiber cement soil obtained by the orthogonal test results is shown in Table 6. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Group Number** & **A** & **B** & **C** \\ \hline K\({}_{1}\) & 1.78 & 2.83 & 3.73 \\ K\({}_{2}\) & 2.86 & 3.56 & 3.63 \\ K\({}_{3}\) & 4.17 & 3.72 & 3.44 \\ K\({}_{4}\) & 5.56 & 4.26 & 3.57 \\ k\({}_{1}\) & 0.45 & 0.71 & 0.93 \\ k\({}_{2}\) & 0.72 & 0.89 & 0.91 \\ k\({}_{3}\) & 1.04 & 0.93 & 0.86 \\ k\({}_{4}\) & 1.39 & 1.07 & 0.89 \\ R & 3.78 & 1.43 & 0.29 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: UCS range calculation table for fiber cement soil. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Group Number** & **Level/Cement Dosage** & **Level/Fiber Content** & **Level/Fiber Length** \\ \hline
1 & 1/9\% & 1/0\% & 1/- \\
2 & 1/9\% & 2/0.1\% & 2/6 mm \\
3 & 1/9\% & 3/0.2\% & 3/9 mm \\
4 & 1/9\% & 4/0.4\% & 4/12 mm \\ \hline
5 & 2/12\% & 1/0\% & 2/- \\
6 & 2/12\% & 2/0.1\% & 1/3 mm \\
7 & 2/12\% & 3/0.2\% & 4/12 mm \\
8 & 2/12\% & 4/0.4\% & 3/9 mm \\ \hline
9 & 3/15\% & 1/0\% & 3/- \\
10 & 3/15\% & 2/0.1\% & 4/12 mm \\
11 & 3/15\% & 3/0.2\% & 1/3 mm \\
12 & 3/15\% & 4/0.4\% & 2/6 mm \\ \hline
13 & 4/18\% & 1/0\% & 4/- \\
14 & 4/18\% & 2/0.1\% & 3/9 mm \\
15 & 4/18\% & 3/0.2\% & 2/6 mm \\
16 & 4/18\% & 4/0.4\% & 1/3 mm \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Proportion of fiber solidified soil in each group. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Group Number** & **Level/Cement Dosage** & **Level/Fiber Content** & **Level/Fiber Length** \\ \hline
1 & 1/9\% & 1/0\% & 1/- \\
2 & 1/9\% & 2/0.1\% & 2/6 mm \\
3 & 1/9\% & 3/0.2\% & 3/9 mm \\
4 & 1/9\% & 4/0.4\% & 4/12 mm \\ \hline
5 & 2/12\% & 1/0\% & 2/- \\
6 & 2/12\% & 2/0.1\% & 1/3 mm \\
7 & 2/12\% & 3/0.2\% & 4/12 mm \\
8 & 2/12\% & 4/0.4\% & 3/9 mm \\ \hline
9 & 3/15\% & 1/0\% & 3/- \\
10 & 3/15\% & 2/0.1\% & 4/12 mm \\
11 & 3/15\% & 3/0.2\% & 1/3 mm \\
12 & 3/15\% & 4/0.4\% & 2/6 mm \\ \hline
13 & 4/18\% & 1/0\% & 4/- \\
14 & 4/18\% & 2/0.1\% & 3/9 mm \\
15 & 4/18\% & 3/0.2\% & 2/6 mm \\
16 & 4/18\% & 4/0.4\% & 1/3 mm \\ \hline \hline \end{tabular}
\end{table} 
Table 5: UCS table of fiber cement soil. Where i = 1, 2, 3, 4, represent four levels; A, B, C, represent three factors; K\({}_{\rm i}\), k\({}_{\rm i}\), R respectively represent:  
K\({}_{\rm i}\): The sum of UCS compressive strength corresponding to a certain level of any factor and the strength is obtained from Table 5. For example, K\({}_{\rm 1A}=0.34+0.38+0.48+0.58=1.78\)  
k\({}_{\rm i}\): Arithmetic average of the sum of UCS compressive strength corresponding to a certain level of any factor, k\({}_{\rm i}\) = K\({}_{\rm i}\)/4. R: A maximum minus a minimum on each factor, called a range, R = max {K\({}_{\rm 1}\), K\({}_{\rm 2}\), K\({}_{\rm 3}\), K\({}_{\rm 4}\)}-min {K\({}_{\rm 1}\), K\({}_{\rm 2}\), K\({}_{\rm 3}\), K\({}_{\rm 4}\)}. For example, R\({}_{\rm A}=5.56-1.78=3.78\)  
A great range corresponds to a great strength difference, indicating that the influence of this factor on the strength of the sample was also greater. R\({}_{\rm A}>\) R\({}_{\rm B}>\) R\({}_{\rm C}\); therefore, the main influencing factors in this experiment were ranked as follows: A (cement dosage), B (fiber content), and C (fiber length).