Soil arching either retaining system or embankment pile support in Plaxis 2D & Doubt in Plaxis 3D tutorial

Question

Hi all, 
 
 Can anyone share some screenshots showing the soil arching effect in the retaining system or embankment pile support in Plaxis 2D for study purpose? 
 
 I did a sample model but couldn't get that effect.

Plaxis 3D ==> 
 
 From this figure how to find the starting of the soil arching and reason for the soil arching?

Thanks

Vasileios Basas · Answer

Hi Nitharshan, 
 Figure 65 shows the redistribution of stresses which characterises the soil arching phenomenon. As the diaphragm wall excavation progresses, the soil around the perimeter of the excavation site becomes increasingly unsupported, and the weight of the soil causes it to arch or bridge over the unsupported area. This arching effect occurs because the soil is able to support itself in compression, allowing it to span over the unsupported area.