Study On The Influence Of Masonry Block Wall Structure On Bearing Capacity Of Gob Side Entry Retaining Wall

The construction of the large size block along the gob side entry retaining wall can realize mechanized construction and good construction efficiency.In order to overcome the weight factor,this paper studies the relationship between the quality and strength of block based on the research of solid block,hollow block,hollow filling block in large size block and hollow dimensional change etc.different structural pattern blocks.Take the applicability of Grey Theory in concrete application and GM(1,1)prediction model in Grey Theory as a study means,build GM(1,1)model based on the data of small size block,and use the model to predict the large size block's strength value and the influence rule of and dimensional change's influence on strength;Study the relationship between the quality and strength of block in hollow,filling hollow etc.different structural pattern,different dimension of hollow with the use of ANSYS simulation.The study shows that: the change of block dimension in large size concrete block has little influence on block strength,and size has more influence on strength when the size is 350mm-450mm;there is still a certain bearing capacity after large size concrete block reaches its compressive ultimate strength,and the remnant bearing capacity assumes linear increase with the increase of size;on the comparison of nonlinear study of different hollow structure and different hollow dimensional block by ANSYS software,decrease of quality has little influence on compressive strength when filling through hole block is under compression and damage,in which circular through hole filling block quality is decreased by 45% while the strength is decreased by 30% only,square through hole filling block quality is decreased by 50% while the strength is decreased by 40%,in the relationship between quality and strength of hollow filling block,the strength is some what increased when the hollow size is less than 0.25,by the comparison of hollow and hollow filling block,quality variation of hollow unfilled block has great influence on compressive strength,hollow filling can improve the bearing capacity of concrete block in a large scale.According to the study results,this paper suggests apply circular through hole block in separation wall support along the gob-side entry retaining,relevant circular hole size is decided according to the required strength.