Study on the Cushioning Mechanism of Energy Dissipative Rock-Shed
Rock-fall is a prevailing geohazard in mountainous areas all over the world.It is hard to be predicted accurately and prevented initiatively for its abruptness and randomness.The most effective structure used currently in transportation engineering with higher frequency of rock-falls happening is the shed tunnel structure.Most of the common used rock sheds are built by setting a sand-gravel cushion layer on the top to protect the main structure from the impact of the rock.Engineering practice indicates that the sand-gravel cushion can buffer and absorb the impacting energy from rock-falls in some degree but it also resulted in large self-weight and high construction cost.A new kind of energy dissipation shed tunnel is proposed here,which can improve the system flexibility by installing an energy dissipation device on structure supports.The cushioning mechanism of the new structure is studied by modeling the structure as a nonlinear mass spring system.An example is given to verify the suggested approach.The computed results demonstrate that the impact energy caused by rock-fall can be well dissipated by energy dissipation devices and,as a result,the maximum impacting force acting on the structure can be reduced much more.Moreover,the cost of construction can be effectively lower than the common shed tunnel.
Rock-fall Compacting force Shed tunnel structure Energy dissipation
HE Siming LUO Yu WU Yong ZHANG Xiaoxi
Key laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Sciences, Chengdu 6 Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
国际会议
成都
英文
85-92
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）