Input dynamic loading, Excess pore pressure shaking jump, ru in FLAC. How to get more smooth ru, dynamic simulation ?

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Hello everyone, I am trying to simulate underground structures using PM4Sand in FLAC. At the beginning of the dynamic simulation, the results always show a sudden spike in ru also Excess pore pressure, the red one is my result simulation. i apply sine wave for the earthquake loading. is there a problem with the static solve, or is there another suggestion? Thank you for your help.

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