Stability Analysis Of Granular Slope And Research On Vegetation Reinforcement Technology

Debris flow is one of the common geological disasters in our country.the engineering problems brought about by debris flow are relatively complicated.And the possibility of a secondary disaster is also relatively high.Therefore,how to deal with and reinforce the loose slope of debris flow is one of the hot issues at present.In addition,the loose slope formed by iron slag pile not only affects the environment,but also affects the safety of people and fields around.In this paper,the debris flow slope in Hongyu village,Hebei province,the iron mine slope in nanwan and wujiagou are taken as the specific research objects,and the stability research of the loose body slope and the corresponding treatment plan are carried out.Based on the investigation and summary of the characteristics and reinforcement methods of granular slope,this paper studies the above problems.the results are as follows:Firstly,the debris flow slope in Hongyu village,the slope in nanwan and wujiagou iron mines were comprehensively investigated,and the physical form,distribution range and physical parameters of the slope were tested and determined accordingly.The results show that the debris flow slope in Hongyu village is prone to secondary disasters,so it is necessary to study its stability and the scope of impact of secondary debris flow disasters.According to the results of the site investigation,the influence range of the secondary debris flow disaster on the debris flow slope in Hongyu village is calculated.the main calculation indexes include: impact force,filling height,over-bending and over-high.The treatment method mainly needs to build a retaining wall in the later stage to intercept and reduce the impact of debris flow on farmland and houses down the mountain.However,the slopes of nanwan and wujiagou iron mines mainly consider the impact on the environment.it is suggested to plant vegetation on the slopes to beautify the slopes and reinforce them.at the same time,it is necessary to verify the impact of vegetation on the slopes.The nonlinear finite element software ABAQUS is used to analyze the stability of debris flow slope in Hongyu village.The intensity method is used in the analysis,and the temperature field value is innovatively used in the realization process.the intensity parameter change is changed by changing the temperature field,and the temperature value is directly taken as the reduction factor in the post-treatment.This method is simple,efficient and intuitive.The safety factors of slope sections P5 and p7 are 2.6 and 2.7,respectively.the failure of both sections is caused by interface friction failure.However,the site influence should be considered in the later stage of governance and different plans should be adopted respectively.For example,the P5 section can be reinforced by retaining wall or anchoring.P7 section needs to be reinforced by retaining wall or other methods that do not destroy subgrade.Finally,the paper studies the mechanism of slope reinforcement by vegetation and analyzes the p2 section of iron slag pile in nanwan bay.The results show that vegetation has effect on slope reinforcement.However,the failure location of p2 section of nanwan iron slag pile is mainly at the deep interface,so it is very difficult for plant roots to penetrate deeply,and its reinforcement effect is not obvious.Due to the fact that the iron slag piles in nanwan are all artificial loose bodies,the slope is not completely stable.planting trees on the top will increase the top load and reduce the stability of the slope.