巷道底板泥化物纤维增强固化体特性试验研究

EXPERIMENTAL STUDY ON CHARACTERISTICS OF FIBER REINFORCED SLAKING MUDSTONE IN ROADWAY FLOOR

矿山掘进巷道底板多为泥岩,在卸载、风化、水及外载荷影响下易发生严重泥化。通过扫描电镜和X射线衍射,分析底板泥岩的矿物组成,并对其泥化机制进行研究。针对研制的泥化物固化剂,分析固化剂的作用机制,并对聚丙烯纤维增强固化体的特性展开试验研究。研究结果表明,聚丙烯纤维可改善固化体的力学特性,大大提高固化体的抗拉强度和抗水性。在试验基础上,进一步分析纤维的增强作用机制,特别是纤维的空间网架约束机制。最后指出泥化物固化处理时应注意的几个关键问题。

In most mining roadways, the floor is mainly composed of mudstone. The mudstone can slake severely under the conditions of unloading, weathering, water and external load effect. With the scanning electron microscopy（SEM） and X-ray diffraction（XRD）, the main mineral components of mudstone are analyzed. Based on the analysis of SEM, the mechanism of mudstone argillization is studied. To stabilize the slaking mudstone, a practicable solidified agent is developed. The effect and mechanism of the agent are also studied in detail. In general, the stabilized mudstone may slake once again under the conditions of water and loading. To prevent the mudstone from re-slaking, a kind of polypropylene fiber is used to reinforce the mechanical behaviors of the solidified mudstone. Some unconfined uniaxial compression tests are conducted. Experimental results show that the polypropylene fiber can improve the mechanical behavior of solidified mudstone, especially the tensile strength and water resistance. With the SEM analysis, the fibers play two important roles in stabilization. A single fiber works through its surface bounding with slaking particles, i.e. surface friction effect. A bundle of fibers just work as a spatial frame. This frame not only restricts the fibers each other, but also supplies active constraint to solidification particles.