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为了探讨砌块式墙体对沿空留巷的适应性,研究了墙体结构形式、破坏过程、本构关系及承载力,揭示了沿空留巷砌块式墙体结构的破坏机理及承载特性。研究结果表明,沿空留巷砌块式墙体的破坏通常发生在第III阶段,在第I,II阶段的留巷具有易护性;砌块式墙体的轴向受压承载力应与其所需的支护阻力相匹配;砌块式墙体的强度应与顶底板的强度相匹配。基于两大匹配原则,提出了砌块式沿空留巷设计的整套流程,将其应用到沙曲矿工程实践,设计了尺寸为0.80m×0.18 m×0.12 m、强度不低于10 MPa的砌块和强度不低于2.5 MPa的砂浆,采用特殊的一顺一丁形式砌筑成宽度为1.6 m、强度介于4.3 MPa和9.3 MPa的墙体,取得了良好的留巷效果。
In order to explore the adaptability of masonry wall to gob-side entry retaining, the structure form, failure process, constitutive relation and bearing capacity of the wall were studied. The failure mechanism and bearing capacity of masonry wall structure along gob- characteristic. The results show that the failure of block-type wall with gob-side entry is usually occurred in stage III, and the retaining roadway in stages I and II is easy to maintain. The axial compressive bearing capacity of block wall should be proportional to The required support resistance is matched; the strength of the block wall should match the strength of the top and bottom panels. Based on the two matching principles, the whole process of block-type gob-side entry retaining design was put forward and applied to the practice of Shaqu mine. The designed size of 0.80m × 0.18m × 0.12m and the strength of not less than 10 MPa The block and the mortar with the strength of not less than 2.5 MPa are masonry walls with a width of 1.6 m and a strength of 4.3 MPa and 9.3 MPa with a special one-in-one form, which has achieved good effect of retaining alley.