• 1 INTRODUCTION

  • 2 PENMAENBACH TUNNEL

  • 3 EXPERIMENTAL ROCK BOLTS

  • 4 RESULTS

  • 5 PEN Y CLIP TUNNEL

  • 6 EXPERIMENTAL ROCK BOLTS

  • 7 RESULTS

  • 8 DEVELOPMENT OF GRANIT

  • 9 LABORATORY TESTS

  • 10 RESULTS

  • 11 CONCLUSIONS

  • 12 ACKNOWLEDGEMENTS

  • 13 REFERENCES

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