Rocscience International Conference 2025 is going to take place in Sydney, Australia Read more

Search Results

Program Assumptions

The main assumptions in the RocSupport analysis method are as follows:

  • tunnel is circular
  • in-situ stress field is hydrostatic (i.e. equal stress in all directions)
  • rock mass is isotropic and homogeneous. Failure is not controlled by major structural discontinuities.
  • support response is elastic-perfectly plastic
  • support is modeled as an equivalent uniform internal pressure around the entire circumference of the circular tunnel

This last assumption in particular, should be carefully considered, when comparing actual tunnel behavior, and calculated results using RocSupport. The assumption of uniform support pressure implies that:

  • shotcrete and concrete linings are closed rings
  • steel sets are complete circles
  • mechanically anchored rockbolts are installed in a regular pattern which completely surrounds the tunnel.

Because this will not usually be the case, actual support capacities will be lower, and deformations larger, than those assumed in RocSupport.

The idealized model used for a RocSupport analysis is not intended to replace detailed final design and analysis requirements for tunnel support. In general, this will require numerical analysis (e.g. finite element), particularly for tunnels with large strain.

However, a great deal can be learned about the interaction of tunnels in weak rock, with various support systems, by carrying out parametric studies using RocSupport, in which different combinations of in-situ stress levels, rock mass strengths and support characteristics are evaluated.

In spite of the limitations discussed above, rock-support interaction analysis has many attractions and, when used in conjunction with numerical analysis, it can provide valuable insights into the mechanics of rock support and reasonable guidelines for the design of this support.

Rocscience logo, click here to return to the homepage Portal Account Portal Account Log In Log Out Home Shopping Cart icon Click here to search our site Click here to close Learning Tech Support Documentation Info Chevron Delete Back to Top View More" Previous Next PDF File Calendar Location Language Fees Video Click here to visit Rocscience's LinkedIn page Click here to visit Rocscience's YouTube page Click here to visit Rocscience's X page Click here to visit Rocscience's Facebook page Click here to visit Rocscience's Instagram page Click here to visit Rocscience's Reddit page Bookmark Network Scroll down for more Checkmark Download Print Back to top Single User Multiple Users RSLog RocFall3 CPillar Dips EX3 RocFall RocPlane RocSlope3 RocSupport RocTopple RS2 RS3 RSData RSPile Settle3 Slide2 Slide3 SWedge UnWedge RocTunnel RocSlope2 Commercial License Education License Trial License Shop safe & secure Money-back guarantee