| Abstrakt: |
The research design refers to the analysis of the Taguchi experimental design method to identify the factors that most influence the value of Bearing Capacity Improvement and the maximum failure load that a slope can resist. Taguchi's experimental design stage includes identifying factors, determining the number of factors and factor levels, calculating degrees of freedom, determining orthogonal arrays, and the number of experiments. Tests were carried out in the laboratory by modeling residual soil slopes of 150 cm x 100 cm x 150 cm. Residual soil is used with pile reinforcement with a variation of four factors (pile diameter, pile spacing, position of a pile from toe Lx/L, and inclination slope), where each factor has three different levels, each with a combination of 3 repetitions. From the maximum failure load, data on the test object can identify the significant factors of the model and their interactions so that optimal values are obtained. The results of ANOVA show that the largest percent contribution (rho %) is factor C (pile position from the toe of the slope) of 50.69%, followed by factor D (slope inclination) of 30.54%, then factor B (pile distance) in the third rank is 15.86%, and factor A (pile diameter) in the last rank is 1.51%. In conclusion, all factors significantly affect the increase in bearing capacity. In addition, based on statistical processing in Taguchi's experiment, the factors that most influence the bearing capacity are factor A 2nd level (pile diameter: 3.175 cm), factor B 2nd level (pile spacing: 10 cm), factor C 2nd level (pile position from toe: Lx/L = 0.5), and factor D 1st level (slope: 37o). From the predicted results of the S/N gain statistics and the optimization confirmation test, it was found that there was an increase in the ultimate bearing capacity performance. The results showed that the reinforcement of the piles on the residual slopes could increase the bearing capacity of the slopes, as indicated by the increase in the maximum failure load that a slope can be resisted. [ABSTRACT FROM AUTHOR] |
