Stability Research Based On DDA Method Of Profiled Concrete-Block Ecological Reinforced Retaining Wall

With the continuous development of China's economy,the strength of infrastructure construction is increasing,the retaining structure is frequently applied in urban construction,ecological protection and highway slope and so on.The special shaped block ecological reinforcement retaining structure has many advantages,such as fast construction,prefabricated Production and good ecological performance.It has broad prospect in engineering prospect.But relatively speaking,the number of theoretical research on the ecological reinforced retaining structure of irregular shaped block is becoming fewer and fewer,and the reference standards,articles and atlas can be used too little.Therefore,it is of theoretical and engineering significance to study the stability of the special-shaped reinforced retaining wall.This paper is based on the water resources department of Fujian province science and technology project ",according to the characteristics of discontinuous special-shaped block stacking dry masonry,the deformation and failure mechanism of continuous block motion analysis method of special-shaped block ecological reinforced retaining wall,retaining wall and backfill inclination of the width and height of the wall,backfill cohesion and internal friction angle and friction block effect of angle on the wall stability.The main research contents and achievements are as follows:(1)By using the discontinuous deformation analysis method,the research is to study the influence of friction angle of different contact surfaces on the mechanical properties of single block on slope in order to study the mechanism of block instability.Compared with the limit equilibrium method,the analysis of discontinuous degeneration breaks through the limitations of the traditional analytical method which can only analyze the mechanical behavior before the failure.The mechanical characteristics of various sizes of blocks on the slope are given in the research and it compared with the theory.On this basis,chosing the model test of an indoor block reinforced earth retaining wall to compare the simulated values of the discontinuous deformation analysis method with the experimental measured values.The results show that the motion blocks include stablity,sliding and dumping,block specific movement patterns with anti slide safety coefficient and anti dumping safety coefficient;using non simulation analysis of special-shaped block ecological reinforced retaining wall is a feasible and reliable continuous deformation.(2)By using the discontinuous deformation analysis method,the research is to study the instability mechanism of irregular reinforced retaining wall.The characteristics of the minimum safety factor of the irregular block is responsed owing to the change of iteration times.The results show that the self locking force against sliding force special-shaped block mainly by the friction between the blocks,block shaped ecological reinforced retaining wall self locking mode well to prevent the wall panel in the wall of earth pressure under deformation.(3)By using the discontinuous deformation analysis,the research angle,the width and the height of backfill,backfill cohesion and internal friction angle and friction angle of interface block effect on the wall stability,selecting the maximum horizontal displacement value and the minimum safety factor as wall panel block stability evaluation standard.The results show that the smaller the angle,the more stable the retaining wall;retaining wall backfill width is smaller and more stable;the lower the height of retaining wall,more stable;backfill cohesion and internal friction angle is large,the wall is more stable;block friction angle is bigger,the more stable the slope retaining wall retaining wall;it suggests that block is 70 degrees.The friction angle is recommended 45 degrees.