锚固剂玻璃钢锚杆支护工程力学特性与应用

针对金山店铁矿锚固剂玻璃钢锚杆支护优化设计中的技术参数和施工质量检测标准的问题,采用室内、现场试验等研究方法对该支护体系的工程力学特性进行了系统研究.结合金属矿山巷道变形特点,将MT219-2002规范中的"锚固力"技术指标修订为"单位锚固长度锚固力",并增加了"延伸率"技术指标.锚固剂的抗压强度和膨胀性室内力学试验结果表明,抗压强度比规范略小,长期膨胀性为0.52%,达到规范的技术要求.在-270m~-340m中段的石英闪长岩和粉状磁铁矿中,采用现有施工技术进行了锚固剂玻璃钢锚杆支护工程力学特性试验,得到各项强度和变形指标.在此基础上,按强度折减系数0.8进行了折减,提出了锚固剂玻璃钢锚杆支护的技术要求和施工质量检测标准.应用该结果进行-312m水平采准巷道支护优化设计和质量检测,在试验地段取得明显的效果.

Engineering mechanics properties and application of glass fiber reinforced polymer bolting with anchoring agent

Aimed at the technical design parameters and construction quality inspection standards of Jinshandian Iron Mine,the engineering mechanics properties of glass fiber reinforced polymer（GFRP） bolting with anchoring agent were studied.According to the tunnel deformation characteristics of metal mine,anchor force in the MT219-2002 standard was revised to the one in unit anchor length,and the indicators of resistance deformation increased.The laboratory test of compressive strength and expansibility of anchoring agent shows the compressive strength is smaller than that of the standard and the long term expansion is 0.52 ％,which meets the standard requirements.The engineering mechanics properties of GFRP bolting with anchoring agent were tested on the quartz diorite and powder magnetite mine in -270 m to-340 m section by means of current construction technology,and all strength and deformation parameters were obtained.Technical requirements and construction quality inspection standard of GFRP bolting support were presented on the basis of reducing the strength by 0.8 times.Finally,they were used to the tunnel optimal design and quality inspection in the-312 m experimental section,obtaining obvious effect.