The Development Of Cheap New Style Retaining Wall Used In Rural Highways

As the connection of national highways , provincial highways and trunk highways , the county level highways have linked the rural and urban in means of material exchange , economic exchange , technical exchange and cultural exchange , etc . Tt is of great significance in proving the development of rural economic and achieving the goal of shaking off poverty and seting out on a road to prosperity that how to build a high quality county level highways . The retaining structures largely affected the long-term stabilization and construction cost of the highways . The conventional gravity retaining wall may not meet the requirements of the county level highways for the sake of its features of large masonry , high cost , wasteful of land , construction complex and so on . Therefore , it is required by circumstances that providing a new type of retaining structure with the advantages of low cost , fine applicability , easy maitenance . To address the issue and combine the existing retaining walls , reinfored earth retaining wall and reinforced gabion , which has a advantages of economic and technical , has been chosen for study . The optimization design and stress-deformation study of the two kinds of walls has done so that they can adapt the construction of the county level highways much better.This text is based on the shoulder reinforced retaining wall in Pu'er City of Yunnan Province . ANSYS software has been applied to anlyze the reinforced earth retaining wall and reinforced gabion wall , then the anlysis results has been inspected and verified by the calculation of PLAXIS . It has been studied and anlyzed that the two kinds retaining walls'development of fracture plane , deformation characteristics , deformation rule of different filler properties with the use of finite element method . Also the technical and economic evaluation has been anlyzed by the comparison of home and abroad exemples in recent years . The main results can be concluded as follows : 1 The fracture planes of both the reinforced earth retaining wall and reinforced gabion wall are different from traditional"0.3H"and"Rinkine-Kulun"simplified fracture planes . The fracture plane of reinforced earth retaining wall produced at the foot of the wall , and developed upwards asumming a log-spiral posture in the reinforced body ; however , the fracture plane's development and progression of reinforced gabion wall is on the outside of the reinforced body along the ends of the ribs , which explains that the reinforced gabion wall should strengthen the exterior strain-stress calculation compared to the reinforced earth retaining wall .2 It can be revealed by the strength reduction of finite element calculation that the distribution of horizontal deformation of both the two kinds retaining walls are different from the tradional earth pressure binding mode . The larger earth pressure of the walls produced at the lower of the middle part , assuming a case of both the ends being small and the middle being large . And the reinforced measure has a low retarding effect on the subsidence of the structure . 3 The bigger elasticity modulus , cohesive srength , internal frictional angel of the filler can make the structure more steady . Contrast to the elasticity modulus and cohesive strength , the internal fricrional angel of the filler contributes more to the horizontal deformation of walls . So in the future reinforced construction , the internal frictional angle is the primary considering indicator compared with the elastivity modulus and cohesive strength in order to the goal of both steady and economical . 4 Compared to the conventional gravity retaining wall , the reinforced earth retaining wall and reinforced gabion wall overwhelming superiority in technical and economic aspect , which has a better mechanical property , construction easier and faster , lower technique request of the builder , easier to control construction quality , better ecological environmental protected and lower cost features . Besides , on the premise of the stability , the arrangement ways of reinforcement has been optimum designed , so that the walls are more steady and economical than ever , and the dosage of the reinforced ribs has been cut back , which attains the goal of saving costs .