How to apply initial stress

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Hi everybody,
    I want to analysis a tunnel model by Tochnog, but I not sure how to apply the initial stress(stress exist before excavation, in-situ stress), by keyword "node_dof" with correct dof lable ? Or "control_unknown_reset_unknown" accompany with "control_unknown_reset_value"?
    Did someone analyze similarly? Any suggestion will be appreciated. Thanks in advance.
Joe Seung
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<div>Hi everybody,</div><div>&nbsp;&nbsp; &nbsp;I want to analysis a tunnel model by Tochnog, but I not sure how to apply the initial stress(stress exist before excavation, in-situ stress), by keyword "node_dof" with correct dof lable ? Or "control_unknown_reset_unknown" accompany with "control_unknown_reset_value"?</div><div>&nbsp;&nbsp; &nbsp;Did someone analyze similarly? Any suggestion will be appreciated. Thanks in advance.</div><div>Joe Seung</div>
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