钢管混凝土墩柱沿空留巷技术与工艺

Technology of Gob-side Entry Retaining Using Concrete-filled Steel Tubular Column

为了解决鲁西煤矿采掘接替紧张局面,实现高应力条件下的高效沿空留巷目的,基于鲁西煤矿3下A02工作面工程地质条件与问题,提出了"钢管混凝土墩柱+柔性垫层+控顶锚索+巷内加强支护+防风措施"的新型沿空留巷技术方案,合理优化设计了沿空留巷技术参数;重点对钢管混凝土墩柱沿空留巷的现场施工工艺进行了研究,解决了墩柱架设、灌注、辅助加强支护等关键技术环节,形成了完善的施工工艺流程。经过现场工业性试验,该新型沿空留巷技术方案很好地保证了预留巷道的完整性,对巷道围岩进行了稳定控制且施工工艺流程简单,达到了高强、高效的沿空留巷效果。

In order to solve the tense situation of excavation and replacement of Luxi Coal Mine and realize the purpose of highefficiency gob-side entry retaining under high stress conditions, based on the engineering geological conditions and problems of A02 working face in the 3 rd lower section of Luxi Coal Mine, this paper proposes a new kind of roadside supporting technology which is composed of concrete-filled steel tubular column + flexible cushion + roof control anchor cable + reinforcement in the road + wind protection measures for gob-side entry retaining, the technical parameters of roadway along gob are optimized. This paper mainly studies the on-site construction technology of concrete-filled steel tubular piers gob-side entry retaining, and solves the key technical links of pier erection, perfusion and auxiliary strengthening support, thus forming a perfect construction process.Through the industrial test in the field, the new technology scheme of gob-side entry retaining ensures the integrity of the reserved roadway and controls the surrounding rock stably;moreover, the construction process is simple, which achieves the effect of high strength and high efficiency of gob-side entry retaining.