综采工作面软煤巷道控制机理及支护技术

Genshui Wu, Wei-jian Yu, Jian Zhang, Y. Ning
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引用次数: 2

摘要

针对软煤层巷道工程地质及变形特点,开展了软煤层暴露研究、理论分析、数值计算和程序设计。首先,根据公开资料,阐述了新兴煤矿软煤层的工程特征和地质条件。同时,分析了软煤巷道锚杆支护的轴向效应、锚杆支护的横向效应、锚杆支护的锚固体力学强化机理及支护强度等问题。文中指出,黏结力很小的软煤在锚索组、w型钢带和金属网的共同作用下,可以形成复合锚固体。塑性损伤区软煤体形成了具有一定承载能力的锚固平衡拱,适应了围岩变形,在巷道平衡拱外顶板处起到了有效的支护作用。因此,提出了全索支撑技术。然后,对无支护、“锚杆+锚索”组合支护和全锚索支护三种巷道方案进行了数值计算和对比分析。结果表明:锚索支护顶板时,不仅控制了顶板沉陷值的持续增大,而且有效地抑制了底鼓值与巷道侧壁量的收敛量;无论是从应力分布情况来看,还是从塑性区范围来看,全索组合支护都比不支护和“锚杆-索”组合支护更为合理。最后,根据新兴煤矿2265工作面软煤层的特点,提出了相应的支护方案,并绘制了具体支护参数和截面设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Control Mechanism and Support Technology of Soft Coal Roadway in the Fully Mechanized Mining Work Face
Aiming at characteristics of the soft coal roadway engineering geology and deformation, the exposure research of the soft coal seam, theoretical analysis, numerical calculation and program design were carried out. First of all, according to the disclosure, soft coal seam engineering characteristics and geological conditions in Xinxing coal mine were expounded. Meanwhile, the soft coal roadway bolt supporting axial effect, the bolt supporting transverse effect, the anchorage body mechanics strengthening mechanism and problems such as supporting strength have been analyzed. The paper pointed out that the soft coal with very small cohesive force can form a composite anchorage body under the combined action of the anchor cable group, the W-type steel band and the metal net. The soft coal body in the plastic damage area formed anchorage balance arch with a certain bearing capacity and adapted to the rock deformation, and which played an effective support role   in the roof outside the balance arch of the roadway. Therefore, the full-cable support technology was proposed. And then, numerical calculation and comparative analysis were conducted on three schemes of the roadway with non-support, with combined support of “anchor bolt and cable” and the full-cable support. The results show that when the roof is supported by anchor cable, it not only controls the continued increase of the subsidence value of the roof, but also effectively suppresses the convergence amount of the floor heave value and the amount on the sidewalls of the roadway. Whether it is from the stress distribution situation, or the viewpoint of plastic zone scope, the combined support of full-cable is more reasonable than that with non-support and that with the combined support of “anchor bolt and cable”. Finally, based on the features of soft coal seam in No.2265 work face of Xinxing coal mine, the relevant support schemes were put forward, and its specific support parameters and cross-section designs were drawn as well.
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