单双目近景摄影测量联合监测弱胶结覆岩叠合式相似材料模型研究

    Study of monocular and binocular close-range photogrammetry joint monitoring superimposed similar material model of weakly cemented overburden

    • 摘要: 相似材料模型是研究矿山开采岩层运动的重要手段,随着采深的增大,多采区采动联合影响的区域变形响应问题逐渐成为关注的焦点。为了克服常规相似材料模型研究深部开采问题的结果失真,以及常规监测技术在观测相似材料模型整体动态变形及任意点动态变形的不足,本文提出叠合式相似材料模拟的新思路,并采用单双目近景摄影测量联合监测新技术研究弱胶结覆岩运动规律。实验结果表明,叠合式相似材料模拟充分考虑了相似原理及覆岩中的关键层结构,研究结果更加可靠,基于等距虚拟面的数字摄影技术监测精度达到0.12 mm,能够满足大几何相似比物理模型的监测精度。通过研究深部矿区覆岩破坏规律发现,宽深比为0.85是白垩系砂岩的临界破坏点,采空区面长大于临界尺寸时将导致显著的冲击地压甚至矿震。单双目近景摄影测量联合监测新方法为研究深部开采区域性岩层移动响应过程提供了技术支持。

       

      Abstract: 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 destructive 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.

       

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