弱胶结富水巷道合理支护技术研究

Study on rational support technology of mine weakly consolidated watery roadway

为了解决大南湖西五矿围岩胶结性差、顶板含水量大导致巷道支护困难的问题,采用现场实测与数值模拟相结合的方法,进行了现场锚固性能测试,分析了随顶板岩层含水量增加,采用架棚支护、锚杆支护和锚杆锚索联合支护3种支护方式时巷道围岩变形规律和支护体受力特征。研究结果表明:在现场围岩条件下锚杆、锚索可以达到规定的拉拔力;顶板含水量较大时采用架棚支护围岩变形严重,梯形棚发生结构性失稳,而锚杆锚索联合支护可以有效减弱在水作用下锚杆轴向力的降低,大幅减小围岩变形。现场观测结果显示锚杆锚索联合支护围岩控制效果显著。

In order to solve the mine roadway support difficult problem caused by the poor consolidated surrounding rock and high roof water content in Dananhu Xiwu Mine,a site measuring and numerical simulation combined method was applied to the site bolting reinforcement performances test and to analyze the surrounding rock deformation law and support stressed features with the roof strata water content increased when three support modes of the square support,bolt support and bolt and anchor combined support were applied.The study results showed that under the condition of the site surrounding rock,the bolt and anchor could reach the stipulated pulling force. When the roof water content was high,due to the square support applied,the deformation of the surrounding rock was serious and the square supports had the structure stability lost occurred,but the bolt and anchor combined support could effectively reduce the axial force decreased under the function of water and could highly reduce the deformation of the surrounding rock. The site observation results showed that the control effect of the surrounding rock was obvious when the bolt and anchor combined support applied.