喷锚支护洞室抗爆现场试验锚杆应变研究

如何提高地下洞室的抗爆能力对国防和民用地下结构设施有着重要的工程意义,而锚杆锚固支护是常见的洞室加固方法。结合现场爆炸试验,介绍了三种锚杆锚固洞室,分析在不同形式锚杆锚固体系的作用下,位于洞室各个位置的锚杆内部应变情况,对比分析了第五炮次作用下锚杆的应变时程曲线,以及到达最大应变的时刻和最大应变所在锚杆位置,其中,短密锚杆锚固作用下锚杆应变数值较小,长密锚杆次之,常规锚杆应变较大;另外,本次试验还对比分析了两种锚杆垫板锚固效果,从抗爆效果上看,碗形垫板具有更好的锚固效果。本文总结出较好的锚杆锚固形式,为工程实践提供一定的借鉴。

Study on Strain of Rockbolts in Underground Cavern Reinforced by Grouted Rockbolts during Site Explosion Resistance Test

To improve the explosion resisting capacity of caverns is very meaningful for underground facilities and the method of rockbolts anchoring is common for reinforcing the underground caverns. Combined with site explosion test, this passage introduces three types of rockbolts anchoring underground caverns and analyses the rockbolts strain at different positions of underground caverns with four different rockbolts anchoring types. And it also compares the rockbolts strain curves with time-histories under the fifth explosion. The maximum strain time and position are brought out. The strain peaks for test points of short and close cables are the smallest; the strain peaks for test points of long and close cables take the second place; the strain peaks for test points of regular cables are the biggest. In addition, two kinds of roof bolt plates are contrasted to get their anchoring effects. From the angle of the explosion resisting capacities, the flaring cup base plates have better anchoring effects. The better anchoring type is summarized and it can afford some use for reference for other projects.