<FONT face=Verdana>新型耗能减震滚石棚洞作用机制研究</FONT>

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Abstract As a kind of serious hazard in mountains，rock-falls are hard to be treated accurately in active ways for their abruptness and randomness. Currently，the most popular method is to set cushion on shed tunnel to buffer the impact passively. However，the effect is not perfect as expected and the cost may be great if adopting thick cushion. Based on flexible retaining theory，a new type of shed tunnel is proposed，which can dissipate impact energy easily by installing shock absorber. Then by modeling the new structure as a mass spring system，the cushioning mechanism and protection effect of new structure are studied with energy theory. Finally，an example is given to check the presented approach. The result shows that the rock impact can be dissipated well by energy dissipative devices，and the maximum impact force on the new structure is smaller. More important，the investment of construction is reduced greatly.

Key words： rock mechanics rock-falls compact force shed tunnel structure energy dissipation

Received: 28 October 2009

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http://www.rockmech.org/EN/ OR http://www.rockmech.org/EN/Y2010/V29/I05/926