Study On Formation Mechanism And Treatment Technology Of Expansive Soil Landslide In Pishihang Irrigation District

Expansive soil is a complex soil with complex properties,such as expansion and contraction,fissure,and consolidation.It is widely distributed in China.Many landslides have occurred since the completion of the Pishihang Irrigation District.Through the site investigation,it is found that the landslide soil is mostly expansive soil,and the expansive soil landslide is a common expansive soil engineering problem.This paper takes the landslide of the Caohe main canal in the Pishihang irrigated area as the engineering background,and analyzes the morphological and scale characteristics of the landslide in the irrigated area according to the collected data of the topography,geology,geology and earthquake meteorology of the Pishihang Irrigation District.According to these characteristics,the formation characteristics of the expansive soil landslide in the irrigation area are analyzed.The main factors affecting the expansive soil landslide are summarized in the previous years of the irrigation area.According to the soil data of the survey,the typical landslide profile of the total dry cut of the Pihe River was selected,and the two-dimensional finite element model was established by Midas/GTS NX software.The stability coefficient of the downslope in the natural state is calculated by software,and the stability coefficient of the slope is reduced by the rainfall condition to determine whether the slope is stable.Through the simulation,the displacement cloud image in the XY direction,the maximum and minimum principal stress map,and the strain diagram,further explore the formation mechanism of the landslide in the irrigation area from the aspects of displacement and stress and strain.Combined with the reading literature and the collected data of the expansive soil landslide control project,the comprehensive management techniques for the treatment of expansive soil are summarized.Taking Wangji Daxie landslide as an example,according to the geological conditions of the cut section,several problems were analyzed,and several schemes were analyzed and compared.The slope reduction and load reduction combined with anti-slide pile and drainage measures and the comprehensive treatment plan for slope protection were selected.Figure31 table4 reference58...