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通过对钻孔周围应力分布的研究,指出“瓶塞效应”是制约其影响范围的主要因素,割缝可以消除此效应;数值模拟表明割缝高度对缝槽上方煤体卸压影响不显著,考虑到蠕变等因素要求缝槽高度不低于16mm;缝槽深度对缝槽上方煤体卸压起到显著影响,当缝槽深度从0.227m增大到0.770m时,缝槽上部1.03m处煤体应力由6.2MPa降低到3.1MPa,通过增大缝槽深度以增加钻孔的影响范围是可行的;由于钻孔割缝后其影响范围增加,相邻钻孔间相互影响使得钻孔影响范围进一步增大,必须把多个钻孔当作一个整体来研究布孔情况.
Through the study of the stress distribution around the borehole, it is pointed out that the “corking effect” is the main factor that restricts its influence range, and the kerf can eliminate this effect. The numerical simulation shows that the effect of kerf height on the pressure relief of the coal body above the slot is not affected Significantly, taking into account factors such as creep and other requirements of the slot height of not less than 16mm; slot depth of the seam above the pressure relief of coal play a significant impact, when the slot depth from 0.227m increased to 0.770m, the slot upper The stress of the coal body at 1.03m is reduced from 6.2MPa to 3.1MPa. It is feasible to increase the influence range of the borehole by increasing the depth of the seam groove. Due to the increase of the influence range after drilling and cutting, the mutual influence between adjacent borehole makes Drill hole to further expand the scope of influence, we must put more than one hole as a whole to study the situation of the hole.