Almost every year, Korea has been suffered from serious damages of lives and properties, due to landslides that are triggered by heavy rains in monsoon season. In this paper, we systematized the physically based landslide prediction model which consisted of 3 parts, infinite slope stability analysis model, groundwater flow model and soil depth model. To evaluate its applicability to the prediction of landslides, the data of actual landslides were plotted on the predicted areas on the GIS map. The matching rate of this model to the actual data was $84.8\%$. And the relation between hydrological and land form factors and potential landslide were analyzed.
Anchor capacity is influenced by ground condition such as shear strength. In general, it has been known that the capacity in soft soil is several times lower that in rock. In addition, it also influenced by the configuration and size of the anchor zone as well. Four types of anchors have been introduced generally according to mechanism of stress transfer and how to be installed. Among them is a bell or under reamed anchor, which can increase resistance. However, the effect of enlargement of fixed zone is controversial. Since such an enlargement is formed by cut mechanically, there always exists so-called smear zone of ground which gives rise to the reduction of shear strength. This paper introduces PDT(Pulse Discharge Technology) anchoring method. The PDT anchoring method is to install an anchor using electrical power so called Pulse power. Since this technique can make not only a bore hole to be expanded but also the ground to be improved by compaction, the anchor installed by PDT is expected to develop shaft and end bearing capacity efficiently. In this study, as preliminary study, we introduce characteristics of ground expansion as well as improvement. In order for quantitative evaluation of the relation between pulse power and ground expansion a series of laboratory tests are conducted. The tests are carried out on sand with different relative densities and various number of pulse discharge. As a result, it is concluded that the expansion and soil improvement appeared to increase with an increase of the number of discharge and with a decrease of relative density.
In Korea, most landslides occurred during the rainy season and had a shallow failure plane parallel to the slope. For these types of rainfall-induced failures, the most important factor triggering slope unstability is decrease in the matric suction of unsaturated soils with increasing saturation depth by rainfall infiltration. The saturation depth was readily estimated using modified Green-Ampt model proposed by Chu et al. (Chu Model) at present. But Chu Model involves some problems for application, because water-redistribution phenomena were not effected. So the modified Chu Model (MCGAM) which reflect water redistribution phono mens was developed. The results showed that the MCGAM had a better agreement with measured volumetric water contents than existing Chu Model.
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