无煤柱开采时,巷道不止一次地受到回采工作影响,其特点是巷道强烈变形,并且受到非对称载荷。为了服务于装备综采机械化回采工作面,就要求回采巷道的长度较长,承受变形较大。随着开采深度的增加,巷道围岩的应力状态增大,这就要求掘进巷道断面积的储备系数不仅能适应于顶板下沉,而且能适应长时期的塑性变形。 When there is no coal pillar mining, the roadway is affected more than once by the mining work, which is characterized by strong deformation of the roadway and asymmetrical load. In order to serve the mechanized mining mechanized mining equipment face, requiring a longer length of the mining roadway, to withstand greater deformation. With the increase of mining depth, the stress state of roadway surrounding rock increases, which requires that the reserve coefficient of roadway cross-section area not only can adapt to the roof sinking, but also can adapt to the long-term plastic deformation.