Study of monocular and binocular close-range photogrammetry joint monitoring superimposed similar material model of weakly cemented overburden
The similar material model is an important means to study mining strata movement.With the increase of mining depth,the combined influence of mining in multiple mining areas regional deformation response problem has gradually become the focus of attention.In order to overcome the distortion results in the study of deep mining problems using conventional similar material model,as well as the shortcomings of routine monitoring technique in observing the overall dynamic deformation of similar material model and the dynamic deformation of arbitrary points,this paper proposes a new idea of superimposed similar material model.The monocular and binocular close-range photogrammetry joint monitoring techniques are used to study weakly cemented overburden motion.The experimental results show that the superimposed similar material model fully considers the principle of similitude and key layer structure in overburden rock,and the research results are more reliable.The monitoring accuracy of digital photography technique based on isometric virtual plane reaches 0.12 mm.It can meet the monitoring accuracy of macrogeometric similarity ratio physical model.Through studying destruc-tive rules of the deep mining area overburden in this paper,it is found that a width-to-depth ratio of 0.85 is a critical failure point for cretaceous sandstone,and gob face length greater than critical diameters will result in significant rock burst or even mine shock.The monocular and binocular close-range photogrammetry joint monitoring provides technical support for the study of regional strata movement response process in deep mining.
weakly cemented overburdensuperimposed similar material modelclose-range photo-grammetrystrata movementdynamic monitoring
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