Discussion on Motion Simulation and Lightweight Protection Early Warning System of Dangerous Rock in Connecting Bridge and Tunnel of Highway in Valley Area
Dangerous rock is very common in the highway bridge and tunnel connection section of the deep canyon area,which is high and steep,and characterised by wide surface and large amount,and strong randomness of disaster.It leads to many engineering problems,such as being hard to identify,shelter,treat,maintain and so on,which poses great challenges for the existing protection measures.Taking the dangerous rock at the exit of Wuxi tunnel as an example,the UAV tilt photogrammetry technology is used to establish a high-precision 3D model of the mountain,identify the distribution of dangerous rock and dangerous rock quickly and accurately,and use RockFall and CRSP-3 D.The results show that:1)the rockfall is mainly free flying,rolling and bouncing.2)The maximum jumping height of the boulder is 70 m and the maximum impact energy is 9 000 kJ,Under the active and passive protection condition,there are still 10%of the high falling rocks breaking the net.3)LS-DYNA simulation shows that the flexible tunnel can intercept the fall rocks under the action of impact,and the components of flexible tunnel is being in an elastic state,but the arch foundation is easy to be destroyed under low energy.Based on this,sudden and progressive dangerous rock fall life cycle lightweight early warning protection system of deep canyon area bridge connecting section is put forward to realize the protection early warning target of"high energy easy repair,medium energy harmless,low energy zero loss".
deep canyon areadangerous rockmovement simulationflexible shedlightweight protection warning system
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