SLIDING CONTROL MECHANISM AND FAILURE MODES OF GEOHAZARD UNDER THE CONTROL OF TIEFENGSHAN ANTICLINE

Geological structure determines the formation and development of geohazards in the region. Exploring the spatial distribution law of geological hazards from the perspective of geological structure plays a critical role in landslide susceptibility assessment. Through detailed field surveys of geohazards and geological structures, the study area was divided into five zones. This paper presents an updated interpretation of a study performed on the characterization of structural features and associated hazards posed by rock slope instabilities along the Tiefengshan anticline in Wanzhou, Chongqing. Under the current situation: (1)The dip angle of the bedding plane in the Northwest Wing of the anticline(Zone Ⅱ)slows down rapidly, and the gentle slope is prone to gentle inclined rockslide. (2)Secondary folds and faults are common in the anticline core(Zone Ⅰ). The combination of bedding planes, faults, and joints controls the sliding of the planar or wedge, and the sliding direction often points to the direction of the fold hinge. (3)The main discontinuity sets act as rear release; small collapses mainly occur in the steep slope zone of the southeast wing(Zone Ⅲ)with sliding or falling. (4)The slope of the stratum inclination transition section(Zone Ⅳ) is stable under natural conditions, and instability may involve weakening failure caused by excavation. (5)In Wanzhou syncline(Zone Ⅴ), the geohazards are mainly sub-horizontal translational landslides and unstable rock belts. Tiefengshan anticline strictly controls the failure type, style, and mechanism of disasters. In the process of geohazard investigation, it is necessary to fully understand the regional tectonic features and deepen the critical role in the formation and development of geohazards. The research method has certain guiding significance for the development of regional geohazard investigation and risk assessment.