高强度钢纤维混凝土在井下煤仓修补中的应用

井工矿井下煤仓是煤矿生产运输系统的一个瓶颈,一旦其发生损坏,将直接导致矿井停产。为了尽量缩短维修煤仓对矿井生产的影响,万利一矿深入研究,研发了一套属于自己的独特维修方案,即使用高强度钢纤维混凝土修补仓壁。该方案不仅可以满足仓体加固强度的要求,而且可以大大减少了维修煤仓的工期。

高含量高强度钢纤维混凝土研究

通过对原材料的优选和相互匹配试验，确定了配制高含量高强钢纤维混凝土的材料与配比；试验中参照国内外进行材料冲击韧性试验标准与方法，针对高含量高强钢纤维混凝土的特点，研制了冲击韧性试验设备，通过大量试验摸索了试验方法。高含量钢纤维混凝土的成型工艺不同于普通钢纤维混凝土，在解决了成型工艺问题后，进行了高含量钢纤维混凝土的性能试验。

钢纤维高强混凝土抗拉强度试验研究

进行了高强混凝土和钢纤维高强混凝土的抗拉强度试验研究 ,并结合试验数据分析了钢纤维体积率、钢纤维类型和尺寸效应等因素对高强混凝土抗拉强度的影响 ,提出钢纤维高强混凝土抗拉强度的计算公式 。

Experimental investigation of axially loaded steel fiber reinforced high strength concrete-filled steel tube columns

An experimental study on the compressive behavior of steel fiber reinforced concrete-filled steel tube columns is presented. Specimens were tested to investigate the effects of the concrete strength, the thickness of steel tube and the steel fiber volume fraction on the ultimate strength and the ductility. The experimental results indicate that the addition of steel fibers in concrete can significantly improve the ductility and the energy dissipation capacity of the concrete-filled steel tube columns and delay the local buckling of the steel tube, but has no obvious effect on the failure mode. It has also been found that the addition of steel fibers is a more effective method than using thicker steel tube in enhancing the ductility, and more advantageous in the case of higher strength concrete. An analytical model to estimate the load capacity is proposed for steel tube columns filled with both plain concrete and steel fiber reinforced concrete. The predicted results are in good agreement with the experimental ones obtained in this work and literatures.