Analysis of typical cases of groundwater in high fill landslide with combined well-hole drainage

Taking the landslide control project of landslide No.13 at Panzhihua airport as an example, this paper briefly describes the basic situation of the landslide and focuses on the hydrogeological conditions of the study area. The rainy season rainfall accounts for 95% of the annual rainfall in the study area, and the occurrence times of moderate to heavy rain and rainfall days of 3 days or more are concentrated in the rainy season from July to September, accounting for more than 95% of the total. The rainfall in the study area is characterized by high intensity and concentration during the rainy season. Geophysical exploration and drilling revealed that the ground water in the field filling area at the rear edge of the landslide was abundant, with a "nest" -shaped discontinuous distribution and obvious stratification. Aquifers are characterized by high clay content, good water-bearing properties, poor pore connectivity, and poor drainage, making it difficult to dissipate quickly. Based on the prominent feature of abundant groundwater in the landslide area, a remediation scheme combining anti-slide piles and joint drainage by well and inclined drainage holes is proposed. After the completion of the treatment project, the drainage effect of the joint drainage measures by well and drainage hole was evaluated, and the practical results demonstrated excellent drainage effectiveness.