Analysis Of The Influence Of The Safety Factor Of A Composite Reinforced Soil Slope Combined With Anchors

With the gradual improvement of reinforcement technology in China,the application of reinforced soil structures is becoming more and more widespread in actual engineering construction.Among them,reinforced earth retaining walls and reinforced earth slopes are more common in engineering because of their convenient construction,excellent load-bearing performance and good overall stability.Reinforced soil slope is a reinforced soil structure formed by laying reinforcing materials such as geogrid inside the soil layer on the basis of ordinary slope.With the development of China’s construction industry,engineering construction is constantly developing to areas with harsh environment and complex geological conditions,and it is difficult to meet the current engineering construction needs by relying only on a single supporting structure or reinforcement treatment.Therefore,the slope can be better adapted to this need through a variety of support structures or joint reinforcement treatment,such as composite rein ANQXSorced soil slopes combined with anchor rods.This paper uses FLAC3 D finite difference software to build numerical models of various reinforcement methods(unreinforced general slope,single geogrid reinforced slope,single anchor reinforced slope and combined geogrid and anchor reinforced slope)at different heights,and calculates their safety coefficients based on the strength reduction method,and by comparing the cloud diagram of maximum strain increment,the law of change of safety coefficient and the cloud diagram of tendon stress,we summarize and conclude By comparing the maximum strain increment cloud diagram,the law of change of safety coefficient and stress-strain cloud diagram,the effect of different reinforcement methods on the overall stability of slopes,the mechanism of single reinforcement and the combined reinforcement of anchor and geogrid,and by comparing the safety coefficient and the law of change of stress-strain cloud diagram under different heights and reinforcement methods,the effect of the number of steps on the overall stability of slopes under different reinforcement methods is investigated.The main conclusions obtained in this paper are as follows:(1)The effect of laying geogrid on the safety coefficient of general slopes is remarkable,with the safety coefficient increased by more than 70% on average,and with the increase of slope height,both the safety coefficient and the upgrading effect gradually decrease;the lower layer of geogrid bears the main load,and the upper layer of geogrid is not in full working condition.(2)The single anchor reinforcement method can improve the safety coefficient of general slopes,but the improvement effect is less than that of geogrid.As the slope height increases,the change trend of safety coefficient and improvement effect remains the same as that of reinforced soil slopes;all anchors enter into normal working condition and bear the soil load.(3)The combined reinforcement method of geogrid and anchor rod has the most significant effect in improving the safety coefficient of general slopes,with the improvement effect being over 85%.Both of them share the load and enter into normal working condition,effectively avoiding the stress concentration phenomenon,greatly improving the stability of slopes and providing sufficient guarantee for the safe storage space of slopes.(4)For the slope reinforced by variable-step anchor,the influence of the change of step number on the safety coefficient is more significant,with the increase of step number,the safety coefficient increases continuously,and the safety coefficient increases more when the step number changes from one to two.(5)For the variable-order reinforced soil slope and the variable-order composite reinforced soil slope,with the increase of the number of steps,both safety coefficients fluctuate around the value of the first-order slope,and the fluctuation range is small,and the increase of the number of steps has less influence on the safety coefficients of both.