摘要
以发生冲击能量事件的耿村煤矿13230下巷为例,通过现场测试冲击后围岩的强度、结构、锚杆锚索锚固力等指标,对冲击载荷作用下围岩及锚固系统损伤失效机理进行了研究。结果显示,在冲击载荷作用下,巷道围岩节理、裂隙进一步发展,强度和完整性极大降低,冲击后直接顶泥岩强度下降了73.3%,两帮煤体强度下降了63.6%,导致锚固系统锚固第二界面强度较低,在高预紧力作用下极易拉脱,导致整个锚固系统失效。提出采用全长锚固高预应力强力锚杆、配合鸟笼锚索联合支护,增加锚固剂与钻孔孔壁之间的粘结面积,可以有效提高锚固系统薄弱环节抵抗冲击载荷的能力,现场实施效果显著。
Taking the 13230 roadway of Gengcun Mine as the example, the damage failure mechanism of surrounding rock and anchorage system under impact energy was studied by testing the strength, structure, anchoring force of bolt and cable.The results showed that under the impact energy, the joints and fissures of the roadway surrounding rock developed further, the strength and integrity were greatly reduced, the strength of the direct top mudstone after the impact was reduced by 73.3%, and the strength of the two sides of coal body was reduced by 63.6%, which leads to the low strength of the anchorage system, and was easy to be pull off under the effect of high pretension.The failure of the whole anchorage system can no longer satisfy the requirements of ordinary bolt mesh support.It was proposed the full length anchorage high pre-stressed strong anchor bolt, combined with the joint support of the bird cage anchorage cable, to increase the adhesive area of the second anchorage interface, effectively improving the adaptability of the anchorage system of the broken rock body under the impact energy, and the field implementation effect was remarkable.
作者
陈金宇
吴拥政
吴同性
杨运峰
孙小岩
Chen Jinyu;Wu Yongzheng;Wu Tongxing;Yang Yunfeng;Sun Xiaoyan(Mining and Design Branch, China Coal Research Institute, Chaoyang, Beijing 100013, China;Mining and Design Department, Tiandi Science & Technology Co., Ltd., Chaoyang, Beijing 100013, China;Henan Dayou Energy Co., Ltd., Yima, Henan 472300, China;Yima Coal Group Co., Ltd., Yima, Henan 472305, China)
出处
《中国煤炭》
2019年第3期37-42,共6页
China Coal
基金
国家重点研发计划(2017YFC0603004)
关键词
冲击地压
锚固力
锚固第二界面
全长锚固
rock burst
anchoring force
second anchorage interface
full length anchorage
作者简介
陈金宇(1982-),男,江苏响水人,副研究员,2008年毕业于中国矿业大学采矿工程专业,现就职于天地科技股份有限公司开采设计事业部巷道所,主要研究矿山压力与巷道围岩支护。E-mail:dayu5000@163.com。
