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一、引言 在煤矿地下开采中,在相当长的时期内,为了防止采动支承压力的有害影响,采准巷道一直采用煤柱护巷的方法。这些护巷煤柱一般不能回收。 回采空间侧向支承压力的影响范围是确定护巷煤柱尺寸的主要依据。从世界各国的矿压观测资料来看,回采引起的支承压力分布范围很广,其影响区域主要与开采深度和煤岩性质有关。当深度为100～200米时,应留10～20米的煤柱;当深度为500～600米、围岩强度为400公斤/厘米时,则应留30～50米的煤柱,但在同样深度的条件下,倘若围岩强度只有200公斤/厘米~2,那么取80～100米宽的煤柱也不
I. INTRODUCTION In underground mining of coal mines, for a long period of time, in order to prevent the harmful influence of mining supporting pressure, the method of adopting coal pillar to protect the road has been adopted in the quarrying of the roadway. These roadway pillars generally can not be recycled. The influence range of the side bearing pressure in the recovery space is the main basis for determining the size of coal pillar for roadway protection. According to the observation data of rock pressure in various countries in the world, the distribution of bearing pressure caused by mining is very wide. The affected area is mainly related to the mining depth and the nature of coal and rock. When the depth of 100 to 200 meters, should stay 10 to 20 meters of pillars; when the depth of 500 to 600 meters, the surrounding rock strength of 400 kg / cm, you should stay 30 to 50 meters of coal pillars, but in the The same depth conditions, if the rock strength of only 200 kg / cm ~ 2, then take 80 to 100 meters wide pillar is not