Stability Analysis And Prevention Of Xiageliao Landslide In Qingtian County, Lishui Cit

The natural phenomenon that occurs more frequently in China is landslides.The landslide not only endangers people’s lives and property,but also destroys vital infrastructure,causes economic losses and has a huge impact on our economy and society.Studying and preventing floods is therefore extremely important and valuable economically.This article uses the Xiageliao landslide in Lishui City,Zhejiang Province as a reference object.The features of the local landslide are detailed,the causes of its instability are examined,and the area’s stability is assessed based on the analysis of field research and data.The landslide is numerically simulated using Geo Studio,which also analyzes how the seepage state and stability of the landslide change as a result of various intensities and continuous rainfall and provides the accompanying Geo Studio examined the landslide,and the related prevention and control strategy was put forward.Through the above research,this paper draws the following conclusions :(1)During the site investigation and analysis,it was determined that the heavy rain and ongoing precipitation were to blame for the landslide’s fast progress,which put the safety of the homes and other structures in the area downstream in grave danger.The Xiageliao landslide is a sizable misplaced creeping rock slide,and the primary causes of landslide danger are prolonged periods of heavy rainfall and shifts in groundwater levels.Geo Studio software was used to assess the stability of the Xiageliao landslide,and it was discovered that the landslide body exhibits good stability when subjected to self-weight and,for the most part,maintains its stability when operating under normal conditions.Notwithstanding,the landslide is prone to instability or under-stability when there has been a lot of rain,which increases the likelihood of the landslide being unstable locally.Thus,more analysis and suitable actions are required to lower the danger of landslides.(2)Software called Geo Studio was used to model the variations in pore pressure of the slope body during a period of seven days of varying rainfall circumstances.The research demonstrates that when the intensity of the rainfall increases at various intensities,the pore water pressure within the landslide body increases;For instance,the porosity water pressure at the slope top was-515 k Pa when the precipitation intensity was 20 mm/d,and it reached a remarkable rise to-26 k Pa when the precipitation intensity was 200 mm/d.The amount of infiltrated water from the slope will rise as the intensity of the rain increases,which will also cause a significant drop in matrix suction and a rise in the water content of the slope body.The slope’s safety factor will decrease,its displacement will grow,and its shear strength will be further reduced as a result.As a result,the probability of landslides rises as rainfall intensity climbs as well.(3)When comparing rainfall intensities of 100 mm/d and 150 mm/d,it was found that when the rainfall reaches a certain level,the safety coefficient of the landslide will continuously decrease with the increase of rainfall,which affects its stability.These analyses were done for 10 days of continuous rainfall and 20 days of rain stopping.Nevertheless,as soon as the rain stops,it starts to rise once more and eventually reaches a stable level.The slope’s stability will also decrease quickly as rainfall increases,its magnitude will also grow,and it will take longer and longer for the slope to return to its previous condition of stability.(4)According to computer models,the stability of landslides under self-weight is lowest at 1.304,however it drops dramatically and even becomes under-stable during heavy or continuous rainfall.Thus,surface and subsurface drainage are required to address the landslide issue.The findings of the simulation of the slope safety coefficient after drainage revealed that it had been effectively enhanced and that it now complied with the specification’s requirements for slope stability safety coefficient.Hence,it makes sense and is efficient to apply drainage techniques.