water level in Plaxis 3D

Dear Nitha,

The principle of setting the water level is essentially the same as in 2D. In PLAXIS 3D Tutorial in Example #7 you can find one of the variants:
https://communities.bentley.com/products/geotech-analysis/w/plaxis-soilvision-wiki/45578/plaxis-3d-tutorial-07-rapid-drawdown-analysis

Also you can watch our video about this Tutorial:
https://www.youtube.com/watch?v=ZCdJuBk3a5Q 

The video is in Russian, but you can use YouTube English automatic translation subtitles in the settings.

Also I add some screenshots from our presentation (sorry, it is also in Russian, but I hope everything is clear):

 
↑ via Borehole

↑ via Create water level option

Dear Mr. Rushan Rushan Gizzatullin

If the excavation at the center or inside the model then how to define the water table?

I have provided coordinates but top surface is covered as shown below.

Thanks,

Dear Nitharshan,

In this case you need to create at least 12 points:
— 4 corner points with coordinate Z = external water level (origin water level);
— 4 points closer to the pit with the same coordinate Z;
— 4 points even closer to the pit, but with coordinate Z = desired water level (usually the bottom level of the pit or lower).

Sorry for the bad screenshots.

If you want to set dewatering in the excavation, sometimes deactivated clusters inside the excavation (excavated soil) are set as Dry. The water level can be left at the initial level. In this case we should get a similar result. Moreover, this method is much easier to set.

Dear Nitharshan,

In this case you need to create at least 12 points:
— 4 corner points with coordinate Z = external water level (origin water level);
— 4 points closer to the pit with the same coordinate Z;
— 4 points even closer to the pit, but with coordinate Z = desired water level (usually the bottom level of the pit or lower).

Sorry for the bad screenshots.

If you want to set dewatering in the excavation, sometimes deactivated clusters inside the excavation (excavated soil) are set as Dry. The water level can be left at the initial level. In this case we should get a similar result. Moreover, this method is much easier to set.

Dear Mr. Rushan,

Thanks for the help again.

If the excavation has embedded depth then we can use dry cluster and interpolate option for water level which will remove the failure on the excavated surface due to water pressure.

but for the shaft excavation (which we don't have no any embedded depth, as shown below, without that base slab => got from net), how can we use cluster dry option? even normal defining water level also cause the failure due to positive stresses (water pressure > effective pressure)?

Thanks.