Problems regarding "writing equation, imposing time dependent load, defining water table"

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Hi,

I am facing the following problem while conducting a simulation:

  1. I need to write the following equation. I tried to write in both the "Variable" and "Analytical function" sections. But every time it says "Unknown variable dl.T". I have defined T and theta_w in "Parameters". Can you please help me to write this equation correctly?

6(dl.T/dl.l)(dl.theta_w)

  1. How can I impose the following time dependent load on the surface? Note: Frequency is 0.77Hz.

  2. How can I apply a constant water table at a height of 0.1 m from the below?



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