恒阻吸能材料及锚固体力学特性研究与应用

Mechanical properties of rocks anchored by constant resistance energy-absorbing material

锚固支护作为地下工程围岩控制的主体,与围岩联合承载形成锚固体,共同抵抗动力灾害释放的能量。传统锚杆(索)支护强度、延伸率不足,在抵抗动力灾害时易破断失效。恒阻吸能材料是一种具有高强、高延伸的新型支护材料。为明确恒阻吸能新材料及其锚固体的力学特性,本文开展了恒阻吸能支护材料与现场常用支护材料MG335、MG500的静力拉伸与动力冲击试验。在此基础上,对MG335、MG500与恒阻吸能支护材料锚固下的岩体开展了霍普金森冲击对比试验,研究了高速冲击下锚固体的变形破坏特征。相比于MG335、MG500锚固体,通过霍普金森冲击试验得到恒阻汲能锚固体的峰值应力提高了42.2%与63.9%,所能吸收的动力冲击能量提高了42.0%与63.2%。恒阻吸能支护技术能够增强锚固体的抗冲承载能力与吸能能力。结合上述试验成果,提出了强扰动下围岩恒阻吸能支护的工程建议,并在千米冲击地压矿井中应用。

Anchoring support using bolts and cables works together with rock masses to form an integrated anchoring system and jointly resists the energy released by dynamic disasters.The strength and elongation of traditional support are often insufficient,causing anchoring system failure when withstanding dynamic disasters.Constant resistance energyabsorbing(CREA)material is a new type of support material with high strength and large elongation.To understand the mechanical properties of this new material and its anchoring system,we carried out static tensile and dynamic impact tests on the CREA anchoring material.Subsequently,the SHPB impact tests were carried out on rocks anchored by CREA,MG335,and MG500 anchoring materials.The deformation and failure characteristics of anchored rocks under high-speed impact were studied.Compared with MG335 and MG500 anchored rocks,the peak stress of the CREA anchored rock is increased by 42.2%and 63.9%,and the absorbed energy is increased by 42.0%and 63.2%.The CREA supporting technology can enhance the bearing capacity and energy-absorbing capacity of the anchored rock under dynamic impacts.Finally,we propose engineering suggestions to anchored rocks using the CREA supporting technology under strong disturbance and carry out a field application in a deep burst-prone coal mine.