Research On Deformation And Mechanical Characteristics Of Pile Anchor Support Structure In Shenyang Institute Of Automation

With the continuous development and utilization of urban underground space,deep foundation pit engineering has been booming.Because of its unique advantages,the pile anchor support structure has become one of the most widely used forms of support.Because the theoretical research of the retaining structure is still lagging behind the engineering practice,it is of great significance to study the deformation of the pile anchor support structure.Based on the background of Shenyang Institute of automation of foundation pit engineering,analyzes the current commonly used in deep excavation,according to the engineering characteristics,soil properties,the surrounding environment and the application requirements,on the foundation of supporting structure deformation and stress characteristics of pile anchor.(1)the frictional resistance between the anchor and the soil layer varies with the length of the anchor cable.The farther away from the orifice,the smaller the frictional resistance,and the closer the orifice is,the greater the frictional resistance.(2)the maximum position of the horizontal displacement of the retaining structure is at the top of the pile.With the excavation of the foundation pit and the application of the anchor cable,the deformation of the retaining structure is effectively controlled.The maximum horizontal displacement of the retaining structure begins to decrease.After the completion of the foundation pit excavation,the maximum horizontal displacement of the retaining structure is about 0.7 times the excavation depth.(3)the prestressing force of the anchor cable is often of little use,and the application of prestress makes the supporting structure produce negative bending moment,and has a certain influence on the supporting system.(4)the numerical value close to the measured maximum horizontal displacement of the supporting structure of a simulation,simulation results and monitoring data show that the spatial effect of excavation,foundation pit shows that the middle horizontal displacement of pile top,two small,negative corner displacement minimum.(5)safety evaluation of Shenyang Institute of automation of foundation pit engineering model established by fuzzy comprehensive evaluation method,and according to the excavation engineering with on-site monitoring and data security,safety evaluation of Engineering application.