Three Kinds Of Protective Rockfall Impact Cushioning Device Development And Its Experimental Study On The Buffering Effect

Collapse of the Rolling Stones disaster is one of the common natural disasters mountain areas,With a sudden,poor predictability and destructive force big,serious harm,serious threat to human activity and life and property safety,Along with our country the development of the western region development strategy formulation and the area of construction,the mountains will be the constroction of a large number of roads,railways,Bridgest,nunnels and other infractructure.Wenchuan earthquake,the collapse of the Rolling Sto nes disasters frequent eetered the stage,Rockfall hazards preventition and control of protective engineering will become especially importanl and very urgent Previous scholars to collapse disaster forrming movement characteristics of the Rolling Stooes on the evolution mechanism of aspects,such as in-depth study.For disaster preventi.on and control of protective system is confined to themretisitl and numerical simulation analysis,to carsry out the testing is relatively rare.For reinforced concrete slab under the rockfall impact cushioning protective system for develiopment and its buffering effect to carry out the experimental study.In this paper,the rockfall impact study and progress at home and abroad are reviewed.In view of the roof panel rockfall impact measures put for ward the following solutions:As a buffer material to soil,secondary buffer protective structure under the lateral Settings.This,paper designed the three kinds of secondary buffer device;1)the u-shape buffer;2)type ?reinforced cushion;3)PVC-U tube buffor.Using the rockfall impact power structures under the failure mechanism and protective measures of research subject test platform,33 groups of roclkfall impact tests are carried out.Through the rockfall impact acceleration measured in experiment,impact force,the bottom of the plate vibration acceleration and plate steel and concrete strain.Analysis of test data,get the impact,the impact force impulse,plate vibration curves of instantaneous velocity and impact results.To compression static test of three kinds of buffer,the pressure and displacement curve,according to the curve shape and the surrounding area of its bearing capacity and energy dissipation capacity is evaluated.According to test data analysis to get the following conclusion:(1)Impact experiment,by comparing the maximum impact force and impact acceleration peak value,such as data analysis of three kinds of PVC-u secondary buffer device buffer effect can be concluded that the energy consumption of six seam with pisolite the cushioning property of PVC-U tubes,the best three slits outfit soil and four seam of pisolite less.(2)By rockfall impact test measured the maximum impact force and impact acceleration peak value data and compared several kinds of cushion protective device of energy dissipation effect,buffer of u-shape with energy dissipation effect is best,six joint PVC-U tubes times,?type reinforced cushion the worst.But consider the buffer cost and manufacturing difficulty,PVC-U tube is better.(3)Through experiment phenomena and data analysis can be concluded that the buffer principle of three kinds of buffer device are the impact impulse to certain circumstances,while increasing the impact,can reduce the impact peak,improve buffer effect.(4)Comparing set protective measures and height of 0.3 m and 13 m test results and in the absence of any protective measures than acceleration energy,it can be seen that unprotected roof plate rock fall injury is very serious,when hit the roof panel set protective measures is of great significance.(5)Static compression test was carried out on the buffer,through the experiment phenomena and data to evaluate the energy dissipation of buffer,can draw six slit PVC-U tube minimum static pressure peak,pressure displacement curve of the smallest,? ? 16 and 12 ? ?reinforced cushion static pressure peak value is bigger,the pressure displacement curve,the larger area compared to the impact test results,six joint the cushioning property of PVC-U tubes got into full play,12 ? ? type reinforced cushion performance of the buffer not fully play,it can be seen from the side ? type 12 ? reinforced cushion in the quality and height higher rockfall impact cases,can play a greater role.