Many transmission towers are located in mountainous areas due to ground utilization
limitations. Slope failures and damage to transmission towers located on slopes are
mainly generated by heavy rainfalls, geological factors, and the presence of a
foundation. These disasters can cause not only serious economic losses but also
casualties. Therefore, it is important to simulate the stability of a slope, including the
foundation of the transmission tower to be place on it, before construction. Several
slope stability programs have been developed (e.g., GeoStudio, Talen); however,
numerical simulations of the slope stability considering a reinforced foundation with
existing commercial programs are insufficient. In this study, the KISS (KAIST Integrated
Slope Stability) program, which considers the effects of the presence of a transmission
tower foundation, was introduced and used to analyze an actual testbed site in
Gyeonggi province in Korea. Moreover, the optimal position of the foundation is
suggested based on a parametric study. It is expected that the developed program can
be used to prevent slope failures and reduce human and economic losses.