Study On The Stability Of The Rockfall Barrier Wall Structures Under The Action Of Rockfall Impact

Rockfall hazards,as one of three big mountain hazards slope rockfall happens frequently in the rugged mountains,though its smaller,but due to the characteristics of rockfall randomness and sudden,makes the engineering protection has the certain difficulty.Along with our country continue to promote the development of the western region,the high-speed railway and highway tunnel extends to mountainous area continuously,rockfall hazards has became one of the main factors that affect road safety construction and train safe passage.Rockfall barrier wall,as the more commonly used rockfall protection measures,which can effectively intercept larger rockfall.At present,the calculation method of impact load on rockfall barrier wall is too simplified,lead to improper rockfall barrier wall design in the engineering examples of damage or instability happens frequently.Therefore,it is necessary to study the impact of rockfall on the structure of rockfall barrier wall,and it has important practical significance and value.In this paper,the structure of rockfall barrier wall used in mountainous slope are used as research objects.through the analysis of the influence factors of rockfall impact effect,two methods of using numerical simulation and indoor model test,the system analyzes the rockfall shape,weight,drop height,buffering soil material and thickness on rockfall impact,into depth,the influence of the diffusion Angle,and synthesize rockfall impact to related to the factors of calculation formula,combined with the traditional mechanical analysis for rockfall impact effect in the most common masonry block wall structure design,to analyze the stability of the block wall,provides reference for the design of the block wall structures,finally combined with specific engineering example for calculating stability,verify the validity of the research results in this paper.First of all,according to the rock fall and block wall system is to simplify the structure characteristics,using a combination of a single ball unit or multiple units simulation rock fall or buffer layers,the wall unit simulation block stone structure,using PFC2 D model,with the domestic and foreign representative of rockfall impact method to calculate the comparative analysis to obtain mesoscopic model parameters.Are analyzed by numerical simulation experiment and rock fall shape,weight,drop height and buffer layers materials and thickness on the influence law of rockfall impact,and into deep,application of rockfall impact calculation formula of exponential function fitting,finally through the buffer soil internal stress range,calculate the impact of the soil material spread Angle is obtained.The indoor model test method,the paper analyzes the size in different rock fall,drop height,soil layer thickness and material conditions,the buffer falls Shi Chong buffer area and stress variation in the block wall structures,and calculated by the experimental results the impact spread Angle of buffer layers of materials,to verify the rockfall impact diffusion is the spread of the conical form.Combined with PFC2 D simulation and the results of indoor model test,the rockfall impact effect theory is applied to the block of stone wall structure design,checking to the stability of the block wall is analyzed,combined with specific engineering example illustrate the effectiveness of the rockfall impact effect theory.