| Landslides as the most common kind of geological hazard,have a huge impact on people's lives and production.Stability analysis and research on prevention and control technology is a subject related to people's livelihood and is of great significance.There are a large number of potential landslide hazards in Laiyuan County of Hebei Province every year due to precipitation,and concentrated in the mountain areas,which has a significant impact on the safety of people's lives and property in this area.Based on this,this paper selects two landslides in Baidaoan Village and Nantai Village,Zoumayi Town,which have large potential safety hazards,and classifies and identifies landslides and optimizes treatment plans,hoping to have a positive reference for the prevention and control of similar landslides.In order to complete this thesis,the following work was done.First,based on the collection of regional geological environment and landslide research data,through detailed field survey and mapping,prospecting,indoor geotechnical testing,insitu testing,etc.,the development characteristics,scale,deformation and damage characteristics and threat objects of the landslide are analyzed,and the target is qualitatively analyzed.The stability of the landslide is analyzed.Secondly,the stability coefficient of the landslide and the remaining sliding force under different working conditions are calculated using the limit equilibrium transfer coefficient method.Finally,a safe,reliable,economical and reasonable landslide comprehensive treatment design plan is proposed.The following main research results have been achieved:(1)The overall shape of the No.1 landslide in Baidaoan Village is tongue-shaped,the main sliding direction is 170°,the thickness of the slope is 0.5-3.0m,the volume is about 1000m3,and the scale is small.The overall shape of the No.2 landslide is a long strip,the main sliding direction is 160°,the thickness of the slope is 1.0-2.0m,the volume is about 340m3,and the scale is small.The Nantai Village landslide has an overall slope of 46°,facing southwest,with an average thickness of 3.0m and a volume of about 2700m3.The scale is small.(2)Qualitative analysis shows that the Baidao'an Village landslide has a loose structure and strong soil permeability due to the Quaternary accumulation material that composes the slope.Under the infiltration of heavy rain or continuous rainfall,the dead weight of the slope increases and is easy to follow.Broken-line sliding produced at the bedrock interface.Due to the relatively loose soil on the upper part of the Nantai Village landslide,the topography of the slope was artificially changed,and the front edge of the slope was increased.After being affected by precipitation or man-made effects,the water content of the soil and the weight of the slope increase,the shear strength of the soil is reduced,and the soil further produces squeezing deformation and creeping or through cracks to form a broken line sliding.(3)The Baidaoan Village landslide adopts the analogy and empirical methods to select the physical and mechanical parameters in the natural state and the saturated state;the Nantai Village landslide uses the inversion analysis method to calculate the physical and mechanical parameters of the sliding zone soil in the natural state and the saturated state.According to the geophysical and mechanical parameters of the landslide,the gravity of the sliding soil mass and the shear strength parameters of the sliding zone soil are determined.(4)The transfer coefficient method is used to quantitatively analyze the stability of two landslides under different conditions(natural conditions,rainstorm conditions and earthquake conditions).The displayed results are: the stability coefficient of the sliding surface of the Baidaoan Village landslide is greater than 1.15 under natural conditions,and it is in a stable state,and under saturated and seismic conditions,the most dangerous sliding surface is at the foot of the slope.The steep ridges are cut out.Under the effect of continuous heavy rains in the future,precipitation will rapidly infiltrate through the loose accumulation layer of the Quaternary System and reach a saturated state,which will gradually reduce the mechanical strength of the soil and increase local deformation.Form a local slippery.The Nantai Village landslide is in the creeping deformation stage.It is in an under-stable-stable state under natural conditions,and is in an unstable state under saturation and seismic conditions.Under the influence of continuous rainfall or other human factors,the deformation and creep of the slope further Development,the slope may cause large-scale instability and slip.(5)By reference and comparison with the domestic landslide treatment plan of the same type,the landslides in the study area were respectively designed with retaining walls,drainage channels,and subprojects for load reduction.The workload of each project was calculated quantitatively and the known The geotechnical physical mechanics,the gravity of the sliding soil and the shear strength parameters on the sliding soil have checked and calculated the stability after the implementation of the project.They were compared and selected from the perspectives of technology,construction conditions,economics,and environmental coordination.,And finally selected the engineering measures of retaining wall and drainage ditch as the recommended plan.This study has reference significance for the targeted treatment of small potential landslides of the same type in the same area.In addition,a systematic and threedimensional monitoring network can be established for potential landslide points,and appropriate monitoring projects can be reasonably deployed to minimize possible geological hazards. |
PDF Full Text Request