The goal of the research was to find a way to improve expansive soil in railway chasm slopes. The researchers used medicine to treat the soil and found that it significantly improved the soil's properties, such as its strength and ability to resist swelling and shrinking. They discovered that the optimal depth for treatment is between 80-100 cm, and that treating the soil 3-4 times is most effective. Overall, using medicine to improve expansive soil in chasm slopes is a feasible and beneficial method.