Stability Analysis Of Soil Nailing Support On Loess Slope

Soil nailing support structure is a common support form of slope composed of soil,soil nailing inside the soil and surface layer of shotcrete.Soil nailing can make full use of the self-stabilizing ability of the soil slope and improve the overall stability and bearing capacity of the slope through active reinforcement.The soil nailing support structure is light,simple and quick to construct,and the economic benefit is remarkable.However,due to the complexity of the hydrogeological conditions,surrounding buildings and underground pipelines in the loess region,the design and construction methods of soil nailing should be adapted to local conditions.This paper,taking the loess slope as the research background,and relying on xi 'an third sewage treatment plant expansion project,combined with the foundation pit supporting design drawings and geological exploration report,the first use of MIDAS GTS NX to establish the numerical model of soil nailing the loess slope,deformation of soil nailing of loess slope is simulated,by simulation of the loess slope deformation value of the soil nailing and field monitoring values are compared,analyzed the reliability of the soil nailing loess slope model.Secondly,the influences of transverse spacing,vertical spacing,hole diameter and incident Angle of soil nail on the stability of support structure were studied.The change law of horizontal displacement,vertical displacement and maximum axial force of soil nailing on the top of loess slope foundation pit after soil nailing is summarized.The influence of soil nailing structure parameters on the stability of loess slope is analyzed.Finally,the sensitivity analysis of the design parameters of soil nailing for loess slope shows that the incident Angle of soil nailing is the main factor affecting the stability of loess slope support structure,and the optimal incident Angle of soil nailing can effectively inhibit the deformation of loess slope.The stability of loess slope support structure can be further optimized by adjusting the horizontal and vertical spacing of soil nails.The research work in this paper can provide reference for the design and engineering application of soil nailing support structure in loess area.