Backfilling

 After erection of RE Wall, the next step is to do backfilling. At every stage backfilling is required and also erection of panels is also done. Layer by layer geogrid is given and also geotextile is worn at the side of RE Wall joints. This process continues till the completion of top panels, i.e., RE Wall top. 

So what's the use of backfilling? Or why this backfilling is done? To answer such these silly questions are, awkward. As this backfilling is done to fill up the foundation or to maintain the soil at the same level. But what, if this question is about inside the RE Wall. That is, inside RE Wall backfilling is going on, or done. 

No need to worry about this. Because in every bridges, where the RE Wall work is going on, backfilling is done inside it. This is done so as to maintain the wall-to-wall distance proportionally, i.e., wall 1 & wall 2. In every RE Wall design, you will see that the vertical height is proportionally inclined. From wall 1 to opposite wall, i.e., wall 2. This is done, so as to maintain equal distribution of load/force, in the trapezoidal cross-section area. For making any road, first an embankment is made in trapezoidal shape and after that the BM & BC starts. Here also same. 

In each and every panels you have to maintain the gap and make the broad little with narrow than the previous layer. If the shape is not trapezoidal, then it will not be perfect and in future may be collapse or fail due to heavy moving vehicles. Hence, it should be made trapezoidal in shape, so that external force coming from upward moving vehicle, distributes equally to the ground. 

So you have all known that layer-by-layer panel erection is done and layer-by-layer geogrid is also given. This is done so as to control the passive earth pressure coming through the wall. In every panel geogrid is given for this reason. 

And also geotextile is given on the panels. What's the reason to give geotextile? Well, it's given just to not pass the sand from inside it. You can see in the picture. Those white-white color are all geotextiles. It's a type of cloth. But this cloth comes in roll, and after that it's cut into pieces by pieces to give at the joints of the panels, to fill fill-up the gaps. So that no fine aggregates or moisture can pass through it. 

And again the same process is repeated. Again backfilling will be done, after that giving of geogrids, after that erection of panels, fixing of geotextiles etc. This process will go on and on until the top layer of panel is reached. All these work understands to be easy, seems to be easy. But when you execute it in your site all these things seem something different and also there is a change in some work. 

So backfilling of RE Wall is almost different. It should be done in both sides. The outer side, backfill should be done up-to the ground level, whereas in the inner side it should be fill completely up-to the top of RE Wall. This is all about the backfilling today.