Research On Numerical Simulation Of Highway Slope Grading Flexible Reinforcement Based On FLAC^3D

In recent years, with the persistently increase of the economy and the furtherimplementation of the Western Development policy, highway traffic constructionchange continuously. At the same time, the problem of highway slope safety isworrying. Slope instability caused by the disaster has been increased year by year, andmade a great deal of injuries and loses in life and loses in wealth. The traditionalsupporting structures such as gravity retaining wall，counterweight retaining wall，cantilever retaining wall， and buttressed retaining wall exposed some problemsgradually in engineering application. The remedy and treatment of highway slope hasbecome even more important than anytime.Soil nail and frame pre-stressed anchor bar, as a new flexible support structure,are widely applied in many highway slope support engineerings. Comparing with thetraditional slope retaining structure, soil nail and frame pre-stressed anchor barperformed advantages in lightweight, economy, stability, height limit, etc. Meanwhile,it is a trend to compose soil nail and frame pre-stressed anchor bar in the reinforcementof side slope for superhighway within recent years, which reduce the project cost andensure project quality. The corresponding research lags relatively comparing withproject practices because of complexity of stress and design when two supportstructures are researched at the same time. Using the finite difference program，throughthe numerical simulation of supporting structure can obtain a true and accurate result.The study method for this aspect is more effective in the present.To explore the anchoring effect and coordinated working performance of soil nailand frame pre-stressed anchor bar in the grading reinforced slope, a numericalsimulation model was established byFLAC^3D. The study contents are as follows：（1） The basic features and the computable principles、the building of the modeland the choise of the structure element of theFLAC^3Dis introduced，meanwhile thefeasibility of simulation to the characteristic of the retaining structure elements isproved．The numerical model of aproject was builded by using ofFLAC^3D．（2） A contrast analysis of the plastic zone and the safety factor was made betweenunreinforced and reinforced slopes according to the slope support construction order.The displacement change of the slope and force character of soil nail and pre-stressedanchor are also studied. The information loss of the prestressed is studied at the sametime.（3） Searching the position of slip surfacet according to the distribution of the plastic zone, cloud picture of the shear strain increment，and the line connecting of themaximum axis-force of soil nailing and frame pre-stressed anchor.The conclusions have reference value for engineering optimum design．...