Stability And Treatment Analysis Of Reticulated Red Clay Landslide

Jiangxi Province is one of the provinces where geological disasters are prone to occur frequently,causing great damage.Especially in Jiujiang in the middle reaches of the Yangtze River,geological disasters such as landslides,collapses,mudflow and karst collapses are widely developed,endangering the safety of human life and property and the construction of ecological civilization.In this paper,based on the data collection,the investigation and analysis of regional geology,basic geology,disaster geology and meteorological and hydrological characteristics are carried out for the reticulated red clay landslide commonly developed in Jiujiang.The development and distribution characteristics of geological disasters in Jiujiang are identified,and the physical and mechanical properties of reticulated red clay are obtained through indoor soil mechanics tests.Taking Changhong East Avenue landslide as an analysis object,combined with engineering geological analysis method,the characteristics of each element and engineering geological characteristics of reticulated red clay landslide were investigated.Using Geoslope software,the stability of Changhong East Avenue landslide is calculated,the influencing factors of Changhong East Avenue landslide are analyzed,the formation mechanism of landslide is discussed,and relevant treatment measures are proposed.The main results are as follows:(1)Landslide and collapse are the main geological disasters in Jiujiang.Affected by topography,stratum lithology,geological structure,hydrogeology and human engineering activities,the spatial distribution of geological disasters is banded and concentrated along water system,tectonic line and mountain range.(2)The reticulated red clay in Jiujiang area has high strength,with developed internal vertical joints and fissures.The principal stress of joints is mostly NE.The fissures are filled with clay minerals such as kaolinite and illite.Under the long-term action of groundwater,fissures expand to form water conducting channels,which lead to the decrease of soil strength,and the back wall of reticulated laterite landslide mostly develops along the primary joint fissures.(3)Through detailed geological investigation,the deformation and structural characteristics of the landslide on Changhong East Avenue were found out,and the characteristics of the sliding body,sliding zone,shear outlet and other elements of the landslide were determined.Changhong Avenue landslide belongs to the reticulated red clay landslide commonly developed in Jiujiang,and has a typical "ternary slope structure" of overlying reticulated red clay,middle glutenite layer and underlying argillaceous siltstone.(4)Using Geoslope software and Morgenstern-Price method to calculate the landslide of Changhong East Avenue landslide under three working conditions respectively(1: natural working condition;2: natural condition+normal water level condition;3: rainstorm condition+highest water level),the stability coefficient is 1.144,1.093 and 0.673 respectively.(5)Changhong East Avenue landslide was formed under the influence of rainfall factors under the condition of engineering slope cutting.The primary structural joints and fissures in reticulated red clay and the "three-dimensional structure" of slope are the basic conditions for landslide preparation.(6)Relevant treatment measures after the occurrence of the landslide have been proposed.We aim to repair and protect the landslide by adopting slope cutting and filling method,anti-slide pile,lattice anchor slope protection,retaining wall,drainage ditch,damage repair and other measures,and carry out real-time engineering monitoring.In addition,through the construction and implementation of the landslide treatment project,we will remove potential safety hazards of the landslide.