钢管混凝土拱架在巷道支护中的发展与现状

为厘清钢管混凝土拱架支护的发展脉络，全面掌握其应用及研究现状，首先对常规U型钢拱架支护现状及问题进行了分析和评述，明确了钢管混凝土拱架支护技术的产生和发展背景。在此基础上，分别从基本原理、现场实践、力学试验、数值模拟、理论计算等方面对发展现状进行了详细分析和阐述。最后，总结了钢管混凝土拱架支护目前的发展形势及显著优势、存在的理论和技术问题及下一步研究重点。主要结论显示：①以2000年为界，可将钢管混凝土拱架支护发展大致分为尝试性实践阶段和研究应用阶段，十余年来发展愈发迅速且获得了良好的支护效果及经济效益反馈；②开展了上百次拱架及构件力学试验，初步掌握了其宏观承载特性，但对承载失效机理的认识尚待深入，同时缺少统一的试验规范；③拱架承载力计算采用轴压极限承载判据，不能满足精度要求；④拱架-围岩相互作用等理论问题及部分关键技术难题，使钢管混凝土拱架支护体系设计理论尚不完善，目前设计施工仍以经验为主。

Development and present status of concrete-filled steel tubular supporting arch in mine roadway

To clarify the development process and status of concrete-filled steel tubular (CFST) arch support, the status and existing problems of conventional U-steel arch support are analyzed firstly; and secondly, the development present situation is analyzed and expounded in detail from the aspect of basic principle, field practice, mechanical test, numerical simulation and theoretical calculation, respectively; finally the development situation, advantages, current theoretical problems, technical problems, and the future research focus of CFST arch support are summarized. The main conclusions are as follows: (1) Taking the year 2000 as the cut-off point, the SFST arch support technology development can be divided into tentative practice exploration phase and research & application phase and it develops quickly in the past ten years with good economic benefit. (2) Based on the thousands of CFST arch and member tests, the macroscopic load-bearing characteristics is preliminary grasped, but the bearing failure mechanism is yet to be further studied to form the unified test specification. (3) The axial bearing criterion used in the CFST arch bearing capacity calculation method can not satisfy the accuracy requirement. (4) Because of the theory problems such as arch-surrounding rock interaction and some key technical problems, the design theory of CFST arch support system is not perfect, so the design and construction is still mainly based on experience.