2021 年 6 巻 p. 104-109
Landslides generally occur on sloping surfaces due to instability of soil mass movement. The calamity is aggravated by the high rainfall intensity which potentially generates the failed slope and a high-water content sludge. It is important to remove the sludge immediately and recover the damaged slope. However, the transportation to bring the soil material for slope recovery and remove the sludge are overpriced. Therefore, instead of disposing of the sludge, this work proposes recycling the sludge on-site by applying the recycling method, or so-called Fiber-Cement-Stabilized Soil (FCSS) method. The modified landslide sludge is then addressed to use as a filling material in the form of a cover layer. In addition, the stability of the modified sludge-covered slope is examined. Therefore, the direct shear test is conducted to obtain the shear strength parameters which are expressed by Mohr-Coulomb failure criterion. In this work, limit equilibrium technique is applied to obtain the Factor of Safety (FS) value as the safety level parameter. The geometrical properties and desired cover thickness are introduced to the FS analysis. The result shows that the FCSS method is effective to modify the sludge and usable for the failed slope cover.
