| A large number of important military supplies stored in the rear army warehouseand the transportation and delivery impacted significantly on the war.Reservoir road is the only way to transport military ammunition and supplies, theweak link for engineering security. The reliability level of road depends on thecomparative vulnerable area. As to the military forces, especially the central andwestern regions, most of caves are hidden in mountain area, and threatened by perilousrock and rock-fall hazard. After a systematic study, the main results obtained are asfollows:1,The perilous rock-stability under strike of cannonball(1) The strike of cannonball is concerned in the stability calculation and formedseveral working condition.(2) Based on the collision theories, has discussed how to calculate the wallop.(3) Under different working condition, the stabilities of three types of perilous rockwere calculated. The impact from cannonball-strike must be concerned in the preventand manage process.2,The perilous rock-stability under explosion of cannonball(1) The explosive effect is similar to the seismic effect and the power transmits inthe form of seismic wave.(2) The dynamic calculating model were built to make further research of thestability under explosive behavior and simulated with ANSYS/LS-DYNA.(3) The concept of stress intensity factor of crack tip was brought forward and itsfinite element method was deeply discussed too.(4) The working conditions are different at the explosive distances. And therock-center vibration velocity, acceleration of vibration, peak ground displacement andcrack tip stress were analyzed and its sensation curve and relative fitting formula wereput forward too.For the perilous rock, the results obtained bring forth some new ideas to the stabilitycalculation and collapse hazard aid in reservoir area. |
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