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煤层开采以后 ,其开采周围的岩体的原始应力平衡状态因采动而受到破坏 ,应力将重新分布达到平衡。在此过程中 ,采空区上覆岩层将发生非连续破坏和连续移动 ,形成冒落带、离层带、弯曲带和松散冲积带的“四带”覆盖结构。利用岩移过程中形成的离层空间 ,通过地表钻孔向离层注浆 ,可减缓覆岩的进一步下沉。因此 ,以矿山开采沉陷理论和弹性薄板理论为基础提出了覆岩离层注浆沉降计算模型 ,它可以确定上覆岩层离层空间发育的层位和岩层间的最大离层间隙量 ,并可对覆岩离层注浆开采地表下沉进行量化预计
After the coal seam is mined, the original stress balance of the surrounding rock mass is destroyed due to mining and the stress will be redistributed to balance. During this process, the overlying strata in the goaf will be discontinued and moved continuously to form the “four-zone” covering structure of caving zone, delamination zone, bending zone and loose alluvial zone. Utilizing the delamination space formed in the process of rock migration, it is possible to slow down the further subsidence of overburden by injecting grout into the sub-layer through borehole drilling. Therefore, based on the theory of mining subsidence and the theory of elastic thin plate, the calculation model of subsidence grouting settlement of overlying strata is put forward, which can determine the strata and the maximum detachment gap between strata in overlying strata. Quantitative prediction of ground subsidence due to overburden grouting mining