The Research Of Deep Soft Soil Foundation Pit Supported By Slope Anchor And Reinforce Slope

Spray anchor bracing system is a common way of foundation pit supporting,but when the excavation of foundation pit soil site condition is bad,for the low bearing capacity of soft soil,using spray the anchor supporting system of foundation pit will produce larger displacement,and can support only little depth of soft soil foundation pit.Considering the spray anchor bracing system has the advantage with low cost and construction technology is mature,if the technology can be applied to the deep foundation pit in soft soil quality conditions,will greatly save the cost.Therefore,this paper makes an improvement on the anchor support system,and this paper ues the slope spray anchor and the slope foot reinforcement support system to support the soft soil deep foundation pit.ABAQUS analyzes the characteristics of the reinforced support system of slope spray anchor and slope foot,which is divided into three aspects:1.Combined with practical engineering of spray anchor supporting of foundation pit supporting system to establish model,considering the quality condition of soft soil,the prestressing anchor,concrete spray layer anchor,Moore-coulomb constitutive model is used to simulate nonlinear characteristics of soil,temperature and shrinkage stress simulation of prestressed anchor in,concrete and plastic damage model to simulate the nonlinear characteristics of concrete.The comprehensive analysis as foundation pit excavation,excavation,displacement of ground surface subsidence,horizontal displacement of shear stress variation characteristics,and overall buckling characteristics of foundation pit are analyzed comprehensively.2.Address in Dalian area a typical soft soil conditions,the application of ABAQUS software to simulate the foundation pit slope reinforcement area,ratio of height to width ratio,the foundation pit slope reinforcement section structural put slope Angle of the influence of the foundation pit failure form,summarizes the slope spray anchor supporting system and slope reinforcement all possible failure modes,mainly including slope spray anchor and slope toe plus solid overall instability,slope toe and solid local buckling,spray anchor bracing system of local buckling.3.The address in Dalian area a typical soft soil conditions,ABAQUS software is used to analyze the slope surface spraying anchor supporting system and slope reinforcement of soft soil deep foundation pit deformation law of change with the excavation depth,and put forward the minimal secondary deformation conditions for slope reinforcement area calculation formula.And then ensure the slope reinforcement section area of the same case,explores the slope foot section of the ratio of height to width ratio of reinforcement of soft soil deep foundation pit deformation,and puts forward the reasonable slope reinforcement section of the ratio of height to width ratio range,finally,explores the point put the slope of foundation pit construction on soft soil deep foundation pit deformation,and puts forward the reasonable structural slope Angle range.