论文部分内容阅读
针对大安山矿巷道底鼓严重,左帮比右帮变形显著,遇水后变形加剧的问题,采用数值模拟和现场试验的方法,研究急倾斜煤巷在顶板坚硬底板较软条件下的失稳机理并提出支护方案.研究结果表明:顶底板岩性差别较大而表现不同的变形特征和底板泥质砂岩遇水泥化是导致巷道失稳的主要原因;最大主应力集中于巷道顶、底部和两帮,且分别为水平应力的1.54倍和竖直应力的1.25~1.67倍;提出锚网索+“W”钢带并对围岩喷浆的非对称支护方案,塑型区显著缩小且减小了拉伸屈服的范围,底鼓量缩小至19.8 cm,锚杆之间形成锚固圈,支护效果较好.
In view of the serious bottom drum of the Daanshan Mine Road, the deformation of the left-hand block and the right-hand block is significant and the deformation is aggravated after the water encounters, the numerical simulation and field test methods are used to study the instability of the steep coal roadway under the softer conditions of the hard roof of the roof. Mechanism and propose the support scheme.The results show that the deformation characteristics of the top floor and the bottom of the muddy sandstone with different lithology and cementing are the main causes of roadway instability.The maximum principal stress is concentrated on the top and bottom of the roadway And two gangs, respectively, which are 1.54 times of horizontal stress and 1.25 ~ 1.67 times of vertical stress. The unsymmetrical support scheme of anchor net + + “W” steel strip and shotcrete for surrounding rock is proposed. Significantly reduced and reduced the range of tensile yield, the amount of bottom drum reduced to 19.8 cm, anchor ring formed between the bolt, the support effect is better.