Bearing Mechanics And Design Of Geosynthetic-Reinforced Embankments Subjected To Localised Sinkholes

With the rapid development of infrastructure,there are more and more railways and roads built in karst areas.However some cavities can't be detected or appear after construction of the structure(Karstic cavities).The structures could be damaged when the cavities collapse suddenly under the effects of the traffic loads,water etc.In engineering practice,geosynthetics are used to reinforce embankments subjected to localised sinkholes.Howerer the bearing mechanics and design of the geosynthetic-reinforced are behind practices and the main contents are as follows:1.The main design methods of geosynthetics-reinforced embankments subjected localized sinkholes are summarized and compared in terms of hypotheses,ultimate limit state and practicabilites of these motheds.2.The bearing mechanics of the geosynthetic-reinforced embankments subjected to localized sinkholes are investigated via PLAXIS3D finite element package.And main influencing factors are researched,including the size of the collapse,embankment height,tensile stiffness of the geosynthetic and property of the embankment soil.3.Simplified calculation methods are proposed to calculate the vertical loads on geosynthetics in collapse and anchorage areas through the statistics of trapdoor experiments results.Inverse triangle load distribution is supposed by analyzing the results of geosynthetic reinforced pile supported embankments experiments.Analytic equations of surface settlements,vertical displacements and maximum tensions of geosynthetics are established under the some basic hypotheses.4.Based on numerical analyses and theoretical derivations,a new design method is proposed by taking into account the serviceability limite state of the embakment and the ultimate limit state of geosynthetics simultaneously.