PLAXIS 2D - ANALYSE SPEED

Mr. Arun,

The reason for that triangle green colour mark will be some stresses exceed your strength parameters. Do you use clay layers with Su?

You can see the stress points by looking plastic points plot and stresses.

For example i provided Su = 15 kPa, so all the shear strength in the soil need to be less than or almost equal to 15 kPa. so eventhough the stress increases shear strength limit to 15kPa so after the relative shear stress takes the value 1 all points below become exceed the failure points. You can easily see this from plastic points.

When i increase the Su=30, failure points further reduce as below.

so you need check the stress and shear strength and need to change the soil parameters (clay layer strength properties increases along the depth so you can use cinc option).

 for water conditions, what is the purpose of the analysis, whether you are going to reduce the water level based on permeabilities or keep the water level as it is without reduction. Steay state ground flow automatically adjust the pore pressure distribution based on permeabilities.

i hope i provide the correct answers, if wrong please tell me Rushan Gizzatullin

Thanks.

THANKS FOR THE REPLY

The soil am using have Su=1,

WE CANT INCREASE SOIL PARAMETERS LIKE Su,

IS THERE ANY OTHER POSSIBILITY TO MAKE THE MODEL PASS, I.e, (TO DO THE EXCAVATION WORK AT THIS SOIL)

BECAUSE WITH THIS PARAMATERS, MY MODEL ANALYSIS SAYS FOR "LOAD ADVANCEMENT FAILURE"

AM DOING A PIPE EXCAVATION WORK USING PLAXIS 

THE FOLLOWING IS THE PARAMAETERS I USED FOR CLAY SOIL

THANKS FOR THE REPLY

NOW AM OK WITH THE STEADY STATE FLOW,

PL SUGGEST ME THE USE OF PHREATIC TOO

Oh how can the soil has this type of parameters? Su=1 is very very small. Please check the parameters.

Phreatic level is just the user defined one, if you draw at what level then pore pressures generated based on that level. this can be adjusted based on the permeabilities values like steady state flow.