## 3 Results and Discussion
### Reduction Factor of the LCP woven Geotextile  
(1) Reduction factor  
When applying a woven geotextile to soft ground, and considering the load induced or applied within the ground, the maximum tensile strength value obtained through the index test is not applied as it is, but with a correction factor that considers the reduction factor of the tensile strength in the construction conditions. At this time, the correction factor is \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**LCP woven** & \multicolumn{3}{c}{**Tensile Strength**} & \multicolumn{3}{c}{**Strain**} & **Modulus** \\ \cline{2-7}
**Geotextile** & **kN/m\({}^{2}\)** & **\% of UTS** & **g/d** & **\%** & **Difference** & **kN/m\({}^{2}\)** \\ \hline MD & 192.94 & 100 & 25 & 2.8 & 100\% & 7827.89 \\ CMD & 157.50 & 81.6 & 17 & 3.9 & 139\% & 4423.99 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Tensile characteristics of LCP woven geotextile in wert and warp directions. called a reduction factor, and the type of reduction factor to be considered is selected and determined by the application field. It is calculated by applying the corresponding reduction factor in the following equation, which determines the long-term permissible strength. For reference, the reduction factor was obtained from Equation (3), which determined the reduction factor in each case in Equation (2):  
\[T_{allow}=T_{ult}\bigg{[}\frac{1}{\prod\text{ RF}}\bigg{]} \tag{1}\]  
\[=T_{ult}\bigg{[}\frac{1}{\text{ RF}_{ID}\times\text{ RF}_{CR}\times\text{ RF}_{CD}\times\text{ RF}_{BD}\times\text{ RF}_{JC}\times\cdots}\bigg{]} \tag{2}\]  
\[\text{ RF}=\frac{Design\ strength}{Actual\ strength(measured\ value\ by\ test)} \tag{3}\]  
where \(T_{ult}\) = ultimate tensile strength, \(T_{allow}\) = allowable tensile strength; RF\({}_{ID}\) = reduction factor for installation damage; RF\({}_{CR}\) = reduction factor for creep deformation; RF\({}_{CD}\) = reduction factor for chemical degradation; RF\({}_{BD}\) = reduction factor for biological degradation; and RF\({}_{JC}\) = reduction factor for joints. Instead of the term of the reduction factor considered in Equation (1), the reduction factor that lowers the long-term allowable tensile strength, which is the long-term performance of woven geotextiles, should be considered. The equations applied in this study were as follows:  
\[T_{allow}=T_{ult}\bigg{[}\frac{1}{\prod\text{ RF}}\bigg{]} \tag{4}\]  
\[=T_{ult}\bigg{[}\frac{1}{\text{ RF}_{CR}\times\text{ RF}_{UV}\times\text{ RF}_{CD}\times\text{ RF}_{BD}}\bigg{]} \tag{5}\]  
where \(T_{ult}\) = ultimate strength; \(T_{allow}\) = allowable strength; RF\({}_{CR}\) = reduction factor for creep deformation; RF\({}_{HIV}\) = reduction factor for UV resistance; RF\({}_{CD}\) = reduction factor for chemical degradation; and RF\({}_{BD}\) = reduction factor for biological degradation. (2) Creep deformation  
A short-term accelerated creep test by the stepped isotherm method (SIM) was performed, and showed a strength retention rate of 62.9% with a tensile strength of 121.35 kN/m\({}^{2}\) within 10% of the creep limit deformation, and the reduction factor for creep deformation was 1.59, as shown in Table 4. The decrease in tensile strength due to creep was 37.1%, and the strength applicable to the design was 62.9% of the tensile strength, which seemed to have a significant effect on the tensile strength. The reduction factor for creep deformation was obtained from Equation (3), and the reduction coefficient of 1.59 meant that the LCP woven geotextile may be applicable within 62.9% of the design strength when applied in the field. (3) UV resistance  
Short-term accelerated tests were performed in a UV-exposed construction environment, and the strength retention rate and reduction factor for UV resistance were measured and analyzed through strength comparison before and after use. The results are shown in Table 5; the strength retention rate was 92.6%, and the reduction factor was 1.08. This was due to the reduction of the tensile strength due to the exposure to UV rays, and the