高强预应力锚杆力学性能实验与支护研究
Experimental Study on Mechanical Properties and Support of High Strength Prestressed Bolt
岳喜占 1杨子仪 2李迎富 2孙茂如1
作者信息
- 1. 中煤新集能源股份有限公司,安徽 淮南 232001
- 2. 安徽理工大学矿业工程学院,安徽 淮南 232001
- 折叠
摘要
高强预应力锚杆支护是传统锚杆支护技术的进一步优化发展.由于深部巷道具有围岩破碎、高应力等复杂地质特征,更多的高强预应力锚杆替代传统锚杆应用于其中.本文通过理论分析,预应力转化试验,左右旋锚杆拉拔试验以及锚固力试验,对比分析高强预应力锚杆的力学性能,揭示了新型左旋高强预应力锚杆加固围岩的支护机理.研究结果表明:① 理论分析锚杆在围岩中的作用机理,阐明了预应力锚杆对围岩的加固作用;② 滚丝锚杆扭矩转化成预紧力的效率约为等强全螺纹锚杆 1.7～1.9 倍;不同直径的左旋滚丝锚杆力学性能均优于右旋全螺纹锚杆,左旋螺纹钢锚杆锚固力大于右旋螺纹钢锚杆;③ 分析新型左旋高强预应力锚杆的结构,其具有预应力高、锚固力高、有效断面大等优势.本研究为深部巷道围岩支护技术的优化与创新提供了有益的参考和借鉴.
Abstract
High-strength prestressed bolt support is a further optimization development of traditional bolt support technol-ogy.Due to the complex geological characteristics of deep roadway,such as surrounding rock breakage and high stress,more high-strength prestressed bolts are used instead of traditional bolts.In this paper,the mechanical properties of high-strength prestressed anchor bolts are compared and analyzed through theoretical analysis,prestress conversion test,pull out test of left and right rotary anchor bolt and anchorage force test,and the supporting mechanism of new left-handed high-strength pres-tressed anchor bolts is revealed.The results show that:① Theoretical analysis of the action mechanism of the anchor rod in the surrounding rock,elucidating the reinforcement of the prestressed anchor rod on the surrounding rock.② The efficiency of con-verting the torque of rolling wire bolt into preloading force is about 1.7～1.9 times that of equal strength full thread bolt.The mechanical properties of left-handed rolling wire bolts with different diameters are better than those of right-handed full thread bolts.The anchoring force of left-hand threaded steel bolt is greater than that of right-hand threaded steel bolt.③ Analyze the structure of the new left-handed high-strength prestressed bolt,which has the advantages of high prestress,high anchoring force and large effective section.It provides a useful reference for the optimization and innovation of deep roadway surrounding rock support technology.
关键词
高强预应力锚杆/滚丝锚杆/全螺纹锚杆/围岩控制/力学实验Key words
high strength prestressed anchor/roll wire bolt/full thread bolt/surrounding rock control/mechanical experi-ment引用本文复制引用
基金项目
安徽省自然科学基金项目(2208085QE144)
出版年
2024
NETL
NSTL
维普
万方数据