深部油页岩巷道变形破坏机理及稳定性控制研究

针对民和盆地窑街煤田侏罗世典型陆相油页岩巷道多次翻修仍然无法保证正常生产需要的现状,结合油页岩沉积环境及其主要物理化学性质分析,采用岩石强度衰减非线性蠕变模型,通过数值模拟研究分析巷道围岩应力和围岩变形速率随时间的变化规律,指出围岩组分中较高的黏土类矿物成分在风化和水理作用下易膨胀崩解,时间效应对围岩强度的影响以及不合理的支护参数是巷道围岩变形失稳的根本原因.在此基础上提出了“高强预紧,适度让压,封闭裂隙,切断水源”的围岩控制技术,通过高强预应力让压锚杆、锚索配套碟形托盘、及时喷浆、注浆等方法实现深部油页岩巷道围岩稳定控制.在埋深800～ 850 m的集中运输下山应用该技术与以往的支护效果进行对比分析,表明提出的围岩控制技术有效控制了巷道变形破坏,保证了巷道的稳定性.

Study on Deformation Mechanism and Stability Control of Surrounding Rock in Roadway for Deep Underground Mining of Oil Shale

According to the situation that the typical roadway of oil shale at the middle Jurassic period in Yao-jie mine field,Min-he basin,could not meet the normal need of using.In this paper,we combined with the sedimentary environment and main physical and chemical properties of oil shale,used the nonlinear strength degradation creep model of surrounding rock,numerical simulation to analysis the rule of stress and deformation speed of surrounding with time,and pointed out that the massive clay mineral in oil shale with the influence of weathering and water physical easily swells and collapses.hile time effect on the strength of surrounding rock and unreasonable support parameter plays an important role in the stability of surrounding rock.Based on the previous study,the appropriated rock control technology of "high resistance and yield pattern,occlude crack,cut off the water " has been concluded.Through the use of high pressure yielding anchor bolt with butterfly pallet,guniting and grouting,the stability of surrounding rock has been implemented.Compared with former support technology,the result showed that control technology of surrounding rock proposed effectively,reduced the deformation of surrounding rock and guaranteed the stability in the field application in the concentration transportation roadway 800-850m in deep.