摘要
为了解决钱家营煤矿大变形巷道支护问题,根据锚杆外形参数研究、锚杆锚固失效模式判定和锚固力残余强度分析,设计出一种新型锚杆.运用锚固力学厚壁理论,研究了不同围岩强度与实验室套筒壁厚的等效关系,并通过实验室和现场的拉拔试验对设计的新型锚杆和煤矿原常规左旋锚杆进行了锚固力对比测试.建立了模拟钱家营煤矿地质力学条件的锚固力测试实验模型.实验结果表明:弹性模量为10~30 GPa的围岩,径向刚度与壁厚3~10 mm的铝套筒一致;弹性模量为30~70 GPa的围岩,径向刚度与壁厚3~7 mm的钢套筒一致;新型锚杆锚固力较矿用左旋锚杆分别提高了13%和16%,吸能能力提高了15%和55%,锚固效果显著提高,更适用于钱家营煤矿大变形回采巷道锚杆支护.
In order to solve the problem of large deformation roadway support in Qianjiaying coal mine, a new bolt was designed according to bolt profile parameters, the determination of bolt anchorage failure mode and the analysis of anchor force residual strength.Based on the thick-walled cylinder theory of anchoring mechanics, the relationship between the strength of different surrounding rocks and the wall thickness of sleeves was studied,the anchoring force test was carried out on the designed new bolt and the conventional left-handed bolt of the coal mine through laboratory and on-site pullout tests.The experimental model of anchoring force test simulating the geomechanical conditions of Qianjiaying coal mine was established.The results show that the radial stiffness of the surrounding rock with elastic modulus of 10~30 GPa is consistent with the aluminum sleeve with wall thickness of 3~10 mm. The surrounding rock with modulus of 30~70 GPa has the same radial stiffness as the steel sleeve with wall thickness of 3~7 mm.The new anchor bolting force is 13% and 16% higher than that of the left-handed bolt in the coal mine, and the energy absorption capacity is increased by 15% and 55%.The anchoring effect is significantly improved, and it is more suitable for the bolt support of the large deformation mining roadway in Qianjiaying coal mine.
作者
韩军
张明
张怀东
TRAN Van Cong
CAO Chen
REN Ting
赵象卓
HAN Jun;ZHANG Ming;ZHANG Huaidong;ZHAO Xiangzhuo(College of Mining, Liaoning Technical University, Fuxin,Liaoning 123000, China;Liaoning Province Coal Resources Safety Mining and Clean Utilization Engineering Research Center, Fuxin,Liaoning 123000, China;School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2520, Australia)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第4期727-734,共8页
Journal of China University of Mining & Technology
基金
辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金项目(55000KY03002)
国家自然科学基金项目(51774174)
关键词
大变形巷道
锚杆外形优化
残余强度
厚壁理论
拉拔试验
large deformation roadway
bolt profile optimisation
thick walled cylinder theory
residual strength
pullout test
