Generating same initial stress for deep tunnel model, but without modelling the height

Nadja Gibis — Thu, 06 Oct 2022 10:21:17 GMT

Hello,

I want to reduce the height of my model by using a line load (right) instead of modeling the hole height above the tunnel (right) like shown in the following picture.

- ground water isn't considered in this model, so no pore pressure

- K0-values differ for the layers (green: 0.2, blue: 0.3, yellow: 1.0)

If the line load is activated in the Initial Phase, than it doesn't work with the K0-procedure, because only the body weight will be used for stress calculation and the line load will be ignored, right?

I tried two different ways:

- adding one more phase for only applying the line load before starting with tunnel excavation

- Gravity loading in Initial Phase

The result for initial vertical stresses σ'_yy are the same as for the original model, but the results for the initial horizontal stresses σ'_xx are always different than the original model.

Question: Is there any possibility at all to compute the same initial stresses (vertical AND horizontal), but for a reduced model height?

Best Regards, Nadja

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Generating same initial stress for deep tunnel model, but without modelling the height

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