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Developer's Tip:
Use of Phase2 to Design Liner Support for Tunnels
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This Developer's Tip highlights two issues regarding the use of Phase2 to
design liner support for tunnels: |
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Joint-Liner Interaction
Liner With Sliding Gap |
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Joint-Liner Interaction |
This tutorial demonstrates how to model liner support in a jointed rock mass. In order to correctly model the interaction of the joint-liner intersections, we must define a Composite Liner which includes a joint at the liner-rock interface. Click here for Tutorial.
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Rock joints intersecting tunnel liner
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Liner With Sliding Gap |
This tutorial demonstrates how to use the Sliding Gap option for liners in Phase2. This is a specialized option for modeling a type of steel-set support system which is sometimes used in extreme ground squeezing conditions. This type of support system incorporates a sliding joint which allows the steel-set ring to freely close in the circumferential direction, until a pre-determined gap has been closed. After the gap closes, the steel-set ring "locks" and axial load can be transmitted through the liner. This technique allows liners to be installed close to an advancing tunnel face without overloading the liner. Click here for Tutorial.
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Calculation of locking strain for circular steel set liner with two sliding gaps
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