在井筒与工业广场煤柱的开采中,回采工作面过井筒为技术关键,应用条带开采是解决此难题的主要措施之一。按照保护对象的技术要求,条带开采的计算准则为:(一) 矿柱稳定;(二) 开采跨度内顶板亦稳定,并具有足够的强度,不允许老顶发生冒落破坏。本文就上述问题进行了理论探讨,并给出计算方法。一、煤柱的极限承载能力 1、煤柱极限核区的基本概念在煤柱边缘的一定范围内,必然出现塑性变形与破坏区,导致其基本失去承载能力。而塑性区向内,出现三向受力的弹 In the wellbore and industrial square coal pillar mining, the mining face through the wellbore is the key technology, the application of strip mining is one of the major measures to solve this problem. In accordance with the technical requirements of the object of protection, strip mining calculation criteria are: (a) ore pillar stability; (b) roof within the mining span is also stable, and has sufficient strength, does not allow the roof collapse occurred. This article has carried on the theory discussion to these questions, and has given the calculation method. First, the ultimate carrying capacity of coal pillars 1, the basic concept of the limit column of coal pillar In the coal pillar edge of a certain range, inevitable plastic deformation and destruction of the area, resulting in its basic loss of carrying capacity. The plastic zone inward, there are three to force the bomb