浇注和包装混凝土防护墙的强度计算

O. Krukovskyi, S. Kurnosov, S. Makeiev, M. Stadnichuk
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摘要

目的。在计算浇筑或包装墙参数时,考虑混凝土随时间的硬化强度,混凝土的设定强度与预期荷载的符合度,所选水泥-矿物混合物与工作地点的采矿和地质条件的符合度的证实。方法。为了证实压合料的物理力学性能对煤层假顶板侧面保护装置的一致性,采用了在实验室条件下根据标准试验获得的混凝土单轴抗压极限强度值。同时,混凝土试样受到单轴压缩,其表面必须光滑平行,这与浇筑和包装防护墙的施工和运行不符合矿山条件。快速硬化液体混合物用于铸造和包装安全墙的施工技术。在一段时间内,由于混凝土的硬化所必需,它们无法感知长壁锻造的岩石的压力。因此,评价铸壁或包裹壁稳定性的标准是在时间τ时刻围岩单轴抗压强度极限增长率与煤层锻造顶板荷载的对应关系。结果。影响混凝土墙强度极限的每一个因素对其破坏风险的重要性已经确立。同时考虑了这些因素的变化幅度。煤层容量因子km的影响最大,可达33%。这项工作的科学新颖性在于综合了造成混凝土防护墙破坏风险的因素的影响系数:其结构;对压在墙壁上的锻造和破碎岩石的缓解;矿井水的化学侵蚀性,用于溶解混合物;结合矿井环境温度和煤层动力,得到井壁强度随时间增长的计算公式。本文的实际意义在于,通过考虑构成混凝土防护墙施工和运行条件的因素,改进了混凝土防护墙强度随时间变化的计算方法。
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Calculation of the strength of cast and packaged concrete protective walls
Purpose. The substantiation of the compliance of the selected cement-mineral mixture with the mining and geological conditions of the working location when calculating the parameters of cast or packaged walls, considering the intensity of concrete hardening over time, the compliance of the set strength of concrete with the expected load. Method. To substantiate the compliance of the physical and mechanical properties of the pressure mixture on the means of protection of the production from the side of the fake roof of the coal seam, the values of the limit strength of concrete for uniaxial compression, obtained according to standard tests in laboratory conditions, are used. At the same time, concrete samples are subjected to uniaxial compression, the surfaces of which must be smooth and parallel, which does not correspond to the mine conditions for the construction and operation of cast and packaged protective walls. Quick-hardening liquid mixtures are used in the construction technologies of cast and packaged security walls. For some time, necessary for the hardening of concrete, they are not able to perceive the pressure from the rocks forged by longwall. Therefore, the criterion for evaluating the stability of cast or packaged walls is the correspondence of the rate of growth of the strength limit of the wall to uniaxial compression with the load from the forged roof of the coal seam at the moment of timeτ. Results.The importance of the impact on the strength limit of the concrete wall of each of the factors that create the risk of its destruction has been established. At the same time, the ranges of change of these factors are considered. The largest influence (up to 33%) is exerted by the coal seam capacity factor km. The scientific novelty of the work consists in the integration of the influence coefficients of the factors that create the risk of destruction of the concrete protective wall: its structure; relief of forged and crushed rocks pressing on the wall; chemical aggressiveness of mine water, which is used to dissolve the mixture; the temperature of the mine environment and the power of the coal seam to obtain a formula for calculating the growth of wall strength over time. The practical significance of the work lies in the improvement of the method of calculating the strength of concrete protective walls over time by considering the factors that form the mine conditions of their construction and operation.
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