Influence Analysis Of Safety Factor Of Special Reinforced Soil Slope

With the rapid development of reinforced soil technology in China,the application of reinforced soil structure has gradually become more and more broad.Among them,reinforced soil retaining wall and reinforced soil slope are most widely used.The reinforced soil slope is based on the common slope,the reinforcement material is laid in the process of filling,so as to improve the performance of the slope.In recent years,with the progress of society,the development of science and technology,and the innovation of geosynthetic materials,the reinforcement method of reinforced soil slope is no longer confined to the traditional equal length reinforcement,and the forms of reinforced soil slope are gradually diversified according to local conditions.This paper mainly takes the reinforced soil slope as the research object,takes the numerical simulation as the main research method,takes the finite difference software FLAC3 D as the main research tool,establishes the model under the different types of the reinforced soil slope,calculates its safety factor through the strength reduction method.The purpose is to compare the reinforcement effect of the special form of reinforced soil slope under the same conditions so as to better apply in practical life.In this paper,the definition of special form of reinforced soil slope is other special reinforcement methods and special slope form of reinforced soil slope except ordinary slope with equal length reinforcement.In this paper,the reinforced soil slope alternately set the main and secondary reinforcement,stepped reinforced soil slope and three steps reinforced soil slope.This paper first establishes the same model as the actual engineering example,and verifies the feasibility of the simulation by comparing the measured value and the numerical simulation value of the slope lateral displacement.Secondly based on the general slope under different reinforcement spacing,the special form of slope,including primary and secondary reinforcement setting slope alternately,stepwise third-order type slope,slope and its safety coefficient and the calculated maximum shear strain nephogram,analyse the change of spacing for the influence of different types of reinforced soil slope safety factor,comparison of different types of slope difference under the same reinforcement spacing.Finally,the reinforcement slope with different length distribution under the primary and secondary reinforcement slope and the stepped slope with different platform width are established to explore the influence of other factors on the stability of the reinforced soil slope.The main conclusions are as follows:(1)To improve the safety factor of the slope can be used by the way of reinforcement and reinforcement effect is obvious,the ordinary reinforced soil slope with the reinforcement spacing decreases,the safety factor gradually increased,the growth rate gradually decreased.(2)the safety factor of the slope under the alternating arrangement of the primary and secondary reinforcement is smaller than the ordinary slope.When the reinforcement spacing is larger,the safety factor of the short reinforcement is larger.With the increase of the reinforcement spacing,the safety factor gradually decreases,and the safety factor of the slope under the main reinforcement begins to exceed the main reinforcement on the way of reinforcement.(3)when the stepped slope reinforcement spacing is larger,the safety factor is slightly greater than the ordinary slope,with the reinforcement spacing decreases,the safety factor is gradually less than the ordinary slope,which is due to the platform caused by the slip crack facing the backward ground foundation development imbalance.(4)The safety factor of the third-order slope is significantly greater than that of the ordinary slope when the reinforcement distance is larger,which is related to the development speed of the sliding crack surface.However,with the decrease of the reinforcement distance,the development of the sliding crack facing the depth of the foundation is slow,and gradually offset the previous advantages,resulting in the safety factor is smaller than the ordinary slope.(5)when the total length of the reinforcement material is the same,the safety factor under the alternating arrangement of the main and secondary reinforcement is greater than that under the equilength arrangement,and the safety factor is positively correlated with the length of the main reinforcement.(6)The width of the lower platform of the stepped slope plays a different role in the different reinforcement spacing.When the reinforcement is dense,the strain concentration in the depth of the foundation can be alleviated,and when the reinforcement is sparse,the superstructure can bear more work.