SPIDER® Rock protection system - Geobrugg AG

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SPIDER ® Rock protection system / Technical documentation / March 2010 Fig. 16: Overview and confi guration I Fig. 17: Confi guration II (left) and III (right) Fig. 18: Confi guration IV (left) and V (right) Fig. 19: Confi guration VI (left) and VII (right) 8 LARGE SCALE FIELD TESTS A total of 29 tests were performed. 7 different anchorage confi gurations were taken into account.
Since a discussion of the test results for all confi gurations would be outside the scope of this paper, the description and analysis is restricted to two examples. The following were covered: test 7 with consideration for confi guration I and test 20 with consideration for confi guration V. Test 7 The following representation shows the spatial orientation of the force vectors in the anchorages, both before and after the test. The direction of these vectors is determining for the equilibrium analysis taking into account their values. The progress of the forces over time was able to be recorded with adequate accuracy using a measuring frequency of 25 Hz. A distinction is made between the load immediately upon impact (peak) and the subsequent forces (residual value) when the block is once again at rest. In test 7 for example the maximum force in anchorage 11 (force in the middle at the bottom, see fi gure 16) is 11.2 kN which then falls to 9.1 kN. The acceleration of the block, also the rigidity of the system with the braking process has a direct infl uence. The more the block can accelerate, the greater the dynamic effects. The measuring device permitted the measurement of a maximum of 8 channels in parallel. So it was possible to measure another 7 forces in addition to the position pick-up. As a result of this, connection of the force measuring cell at anchorage 1 was not possible with test 7. In Table 1 those values were interpolated as appropriate around the block, taking into account the force distribution. Fig. 20: Test 6 confi guration I Fig. 21: Spatial orientation of the force vectors Fig. 22: Measured forces in the anchorages 9
Page 1 and 2: SPIDER ® Rock protection system Us
Page 3 and 4: Based on material technology innova
Page 5 and 6: It was also possible to mount a str
Page 7: FRICTION TESTS Before starting with
Page 11 and 12: forces from static back calculation
Page 13 and 14: Represented in Table 3 are the forc
Page 15 and 16: KNOWLEDGE GAINED AND CONCLUSIONS FO

SPIDER® Rock protection system - Geobrugg AG

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