Study On Stability Evaluation And Treatment Of Unstable Slope In Loushegou

As one of the common geological disasters,landslides are very harmful.It refers to the phenomenon that the surface soil layer is subjected to vibration,or a large amount of precipitation in the rainy season causes water accumulation,the foot of the slope is washed by the river,and the slope body is soaked,which causes a large displacement of the whole soil layer.It mainly causes the mountain to collapse and slip.Move to bring devastating disasters to buildings,structures and personnel within the slope.In recent years,due to the rapid development of China's economic construction,the scope and scale of engineering construction have increased greatly.Together with the abnormal changes in the global climate,the occurrence of landslide disasters has been on the rise.Large-scale landslides with loss of people's lives and property occur every year.China has also increased its research and governance of geological disasters year by year.The investigation and treatment of landslides is particularly important.Reasonable and effective exploration work directly affects the decision-making and effect of prevention and control projects.Loushegou,Baima Village,Tianchi Town,is located in the Wenxian County,Longnan City,Gansu Province.It is at the southernmost tip of Gansu Province and borders Sichuan and Shanxi.It belongs to Qinba Mountain.It borders on Qingchuan County and Pingwu County in Sichuan Province in the southeast,Jiuzhaigou County and Gannan Autonomous Prefecture in the west,and Wudu District in the north.Baima Village,Tianchi Town,is located in the vicinity of Loushegou in Tianchi Town.It is one of the most seriously affected villages in the“8·7” storm floods and mudslides in longnan.The geological environment of the Loushegou is poor.During the period of the '8·7” storm and debris flow,it was affected by heavy rainfall.Many houses were damaged.The residents' channel was narrow and curved,and many roads passing through the channel were It was washed away and suffered heavy losses.The resettlement site project is mainly used to resettle the villagers affected by the three communities in Baima Village in the “8·7” storm floods.This paper is based on the unstable slope of the Loushegou resettlement site in Baima Village,Tianchi Town,Wen County,Weinan City.The basic characteristics and formation conditions of the unstable slope are discussed while analyzing the geological environment conditions of the unstable slope.After analyzing and studying its stability,a disaster management plan was proposed and designed.The following results were achieved:(1)Through the initial geological survey of the study area,this paper has a deep understanding of the relevant information of the unstable slope,and mainly grasps the geological environment conditions of the study area(such as meteorological hydrology,topography,stratum lithology,geological structure).And human activities,etc.),according to the main lithology and slope shape and position of the slope stratum,the unstable slope is divided into three sections from west to east,and the formation conditions are discussed from the intrinsic factors and the inducing factors.The main factors causing the instability of the steep slope in the study area are: a large amount of rainfall in the early stage,complex and diverse stratigraphic lithology and geological structure characteristics,geological tectonic movements in recent years and artificial slopes at the resettlement sites.(2)Through the study of the basic characteristics and formation conditions of unstable slopes in the study area,the stability of the unstable slopes is then studied by qualitative and quantitative analysis.Qualitative analysis uses geological history analysis method,quantitative analysis selects limit equilibrium method.Because of the large amount of rainfall and frequent geological tectonic movements in the region,the unstable slope is formed.Therefore,we choose three working conditions(natural conditions,rainfall).Analysis of working conditions and seismic conditions),and finally comprehensive evaluation of stability.It can be seen that the x1 slope is in a basically stable state under natural conditions;and the fracture development and rock mass fragmentation due to weathering of the rock mass,the possibility of loose and dangerous rock mass instability under rainfall conditions and seismic conditions is large.Induced collapse and rockfall disasters;under natural conditions,the x2 and x3 slopes are in an unstable state,under unstable and unstable conditions under rainfall and seismic conditions,and the stability is poor;under the combined effects of precipitation and earthquake,the instability The possibility is large,and it is easy to induce collapse and landslide disaster.(3)According to the relevant characteristics of the unstable slope of Loushegou,the final treatment plan is as follows: x1 unstable slope(mileage 0+000~0+100): cutting square +retaining wall + anchor lattice structure + intercept drainage Drain + grid in the grid;x2unstable slope(mileage 0 + 100 ~ 0 + 220)and x3 unstable slope(mileage 0 + 220 ~ 0 + 498):cut square + anchor lattice + gravity retaining Wall + intercepting channel + lattice filled with hexagonal bricks and biological measures.After the treatment,the slope is stable and the safety hazard is eliminated.It has important reference value and reference significance for similar projects.