Study On Groundwater Infunction Of Kualiangzi Landslide In Zhongjiang

Kualiangzi Landslide in Zhongjiang is a large horizontal pushing landslide. Indiscernible, more indecisive, superficial understanding of the genesis, strange outbreak reasoned, difficult to disaster prevent and reduce, and high risk are its basic characteristics. After two intense slides in 1949 and 1981, it slowly creeps in non-flood season but accelerating slides in heavy rainfall flood season now. A large amount of investigations showed that the occurrence of landslides is often closely related to the dynamic characteristics and law of groundwater seepage field, which are caused by the rainfall and the water level variation of ground water reservoirs. So the study of Kualiangzi Landslide’s groundwater effect and landslide deformation mechanism at different stages are great importance to stability assessment and treatment of landslide nearly horizontal layers. In addition, the study will be a theoretical help to the research and early monitor warning system establishment of the strong indecisive, great damaging landslides.The purpose of this paper is to research the formation mechanism of the landslide at various stages under the condition of rainfall and groundwater effect on the stability of the landslide according to the landslide site exploration and hydro geological exploration results with hydrological test and field survey research methods,combined with previous data. In this paper, the main research results are as follows.1. The deformation pattern of Kualiangzi Landslide is basicly divided into three categories. First, the landslide remains creep deformation in the non-flood season, with a displacement 0.3 ~ 0.8 mm/d. Secondly, the landslide displacement jumps in heavy rainfall flood season. The displacement increases tens of centimeters in a short-term. The maximum displacement has reached 25 mm/d. The landslip horizontal pushes severely when there is extremely heavy rainfall, which is the third status. The slide reached 20 ~ 30 m in 1949 and about 10 m in 1981.2. We analyze the rain, the underwater level, deep and surface displacement data, underwater current meter and directions to find out how the landslide creeps deformation in non-flood season and how the landslide acceleratedly moves in heavy rainfall season. The results show that landslide creep deformation in non-flood season is mainly caused by the creep characteristics of sliding zone. The shear creep characteristics in sliding zone and rear pull trap tank water level effect on the landslide accelerated motion in flood season. Besides, the groundwater aquifer system and the front slope infiltration are thought to be related to the accelerated motion.