Rock support of the L3 experimental hall complex

Conference · Fri Jun 01 04:00:00 EDT 1990

OSTI ID:6289076

Laughton, C

The methods of excavation and support selected for the LEP works are discussed in this paper. The excavation of the halls and chambers in discrete passes, from the roof down, and their temporary support by patterned fully bonded rock bolts and shotcrete ensured that mass deformations were contained. When working in soft rock materials where discontinuity, elastic and possibly plastic deformations may each play an important role in the overall rock structure stability, it is of paramount importance to systematically monitor the behavior of the rock in-situ. The use of instrumentation to indicate location, direction, levels, and rate of movement is essential to ensure that a safe, efficient and economical mining operation can be undertaken, and that any remedial action will be taken at the appropriate time. The use of the New Austrian Tunneling support mechanisms allowed the engineer greater flexibility in handling local reinforcement of the rock structure if superficial or relatively deep-seated instability was encountered. However, in the case where second linings are to be accommodated and flexible support mechanisms used, care should be taken to foresee over-excavation in weaker zones to allow for larger displacements prior to the attainment of confinement-convergence equilibria. 4 refs., 7 figs.

• Research Organization: Superconducting Super Collider Lab., Dallas, TX (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-89ER40486
• OSTI ID: 6289076
• Report Number(s): SSCL-318; CONF-9006120--5; ON: DE91004960
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430100* -- Particle Accelerators-- Design
Development
& Operation
EXCAVATION
LEP STORAGE RINGS
MECHANICAL STRUCTURES
ROCKS
STORAGE RINGS
SUPERCONDUCTING SUPER COLLIDER
SUPPORTS
UNDERGROUND FACILITIES