Abstract: This paper studies the failure modes and formation mechanism of a highway landslide in Hainan Province by using the combination0engineering geological mapping, engineering geophysical exploration and engineering geological drilling methods. Throughout the investigation, it is concluded that the landslide can be divided into three portions; the deep potential landslide, the historical surficial landslide at the west side of the highway and the recent surficial landslide at the east side of the highway. factors that directly attribute to the landslide are, the F1 well developed fissured zone within the landslide area and the excavations for the highway alignment in the east direction. Based on the stability analysis of the landslide, practical landslide mitigation and prevention measures are proposed in the paper.

Key words: Engineering Geophysical Explorations, Landslide, Fissured Zones, Formation Mechanism, Mitigation Measures