| People grass reinforcement bars mixed with mud walls built to modern reinforced soilembankment, retaining walls, bridge abutments,etc,from ancient times reinforced soiltechnology has a long history of application, which has a reinforced earth retaining wall dueto the attractive appearance, build the economy, convenient construction and excellenttechnical performance advantages become an important aspect of modern reinforced soiltechnology, much favored by the engineering sector.Compared with the history and scope ofreinforced soil retaining wall application, theoretical research seems falling behind andinadequate, especially in the dynamic characteristics and dynamic design. Our country is anearthquake-prone area, which requires a certain degree of geotechnical structures seismicperformance, while China and other countries have not a complete theory and standards tothe seismic design of reinforced earth retaining wall, so the effects of the reinforced earthretaining wall at earthquake study dynamic performance is very necessary and urgent. Thisarticle focused on the dynamic performance of reinforced soil retaining wall under seismicsimulation analysis. The main contents and results obtained are as follows:（1）Describe the history of the development of reinforced soil retaining wall, dynamicand destroy instances of domestic and foreign research under earthquake reinforced soilretaining wall. Integral part of the terms of reinforced soil retaining wall, material andstructural characteristics and other requirements were summarized and summarized. Introductand analyse reinforcement mechanism of geogrid: reinforced the principle of friction,cohesion principle of quasi-homogeneous materials, etc. on behalf of the principles, theoriesand elastic-plastic laminates equivalent confining pressure theory. And analyzed andsummarized various failure modes and their design method of internal and external stabilityof reinforced earth retaining wall.（2）According to the structural characteristics of reinforced soil retaining wall, whichwas reduced to a plane strain analysis. Based on the composition characteristics,of reinforcedearth retaining wall material,choosing the appropriate unit type. Set key parameters, usingANSYS finite element software on a large enough scale of a reinforced soil retaining wall anonlinear finite element model consisting of the soil unit reinforcement unit, contact unit,panel unit, set key parameters, and finite element analysis was carried out under the force ofthe earthquake.（3） Three aspects of reinforced earth retaining wall simulation results wereanalyzed,including wall horizontal displacement, acceleration amplification effect, muscle tension with the distribution. Wall horizontal displacement areas:seismic action at all levels,retaining a high level of displacement direction along height of the wall increases,when theearthquake acceleration is small, horizontal displacement of retaining wall along the walldirection changes smoothly, increments are smaller, in large earthquake acceleration, thedirection of the horizontal displacement of the retaining wall along the wall height is larger,increments are larger. With the increase in peak acceleration of seismic waves, themaximum value of horizontal displacement of the top of a particle reinforced soil retainingwall showed a tendency to increase, the horizontal displacement of the points away from thebezel the smaller; maximum displacement point of reinforced soil retaining wall at the topnear the local panel; seismic acceleration reaches a peak, the horizontal displacement ofretaining wall did not reach the maximum. Acceleration amplification effect: themagnification of wall particle acceleration increases with peak acceleration of the earthquake;along the direction of the height of the wall, the magnification of the acceleration showed alarger trend; the magnification of the acceleration on top of the reinforced soil retaining wallparticle is maximum. Rally distribution of reinforcements: In a small0.1g peak accelerationof the earthquake, the maximum tensile reinforcement increases with the height directionalong the wall, decreases with the length direction along the ribs, ribs and baffle with a fixedconnection, reinforcement belt tension maximum at the junction baffle and reinforcement,retaining walls for seismic design should consider the connection point between the tworeinforcement; at peak acceleration of0.2g~0.4g seismic waves, the reinforcement tensionalong the length of the first growth large then decreases, as earthquake intensity increasing,the potential for rupture moved behind,the impact of the earthquake intensity. should beconsidered in the length of the retaining wall reinforcement design... |
PDF Full Text Request