摘要
为解决深井巷道底鼓治理难度大的难题,通过分析制约底板加固技术发展的因素,提出了底板预应力锚索加固的方法和工艺;阐述了搅拌头、锚固剂和止浆塞对锚固效果的影响作用。试验结果表明:钢管树脂锚固剂固定式搅拌头和大直径快、慢速混合使用的锚固剂,锚固效果最好,满足了巷道底板预应力锚索初始支护的要求;采用锚索专用止浆塞实现了锚索自由段带压注浆,增强了底板围岩的强度,保证了底板锚索的锚固性能。预应力锚索加固不仅使巷道底板锚索及时主动承载,而且使底板围岩及锚索锚固性能得到强化,最大程度保持底板围岩的完整性,保证加固效果,降低了支护成本。
In order to solve a high difficult problem of the floor heave control in the mine roadway of the deep mine, the paper analyzed factors to restrict the development of the floor reinforcement technology and provided the method and technique of the floor pre-stressed an- chor reinforcement.The paper stated the mixing head, anchoring agent and packer affected to the anchoring effect.The experiment results showed that the steel tube resin anchoring cartridge with fixed mixing head and the anchoring agent with large diameter fast and slow mix- ing would have a best anchoring effect and could meet the initial support requirements of the pre-stressed anchor for the floor of the mine roadway.With the special packer, the free section of the anchor could be pressurized grouted to enhance the strength of the floor surround- ing rock and to ensure the anchoring performances of the floor anchor.The reinforcement of the pre-stressed anchor would not only make the floor anchor timely and actively loading, but could make the floor surrounding rock and the anchoring performances enhanced.Thus the integration of the floor surrounding rock could be maximally kept to ensure the reinforcement effect and reduce the support cost.
出处
《煤炭科学技术》
CAS
北大核心
2013年第4期16-19,23,共5页
Coal Science and Technology
基金
国家自然科学基金委与神华集团有限公司联合资助项目(U1261211)
关键词
预应力锚索
快速锚固
底鼓
注浆
搅拌头
止浆塞
pre-stressed anchor
rapid anchoring
floor heave
grouting
mixing head
packer
