为研究玄武岩纤维（basalt fiber, BF）砂浆在复杂地下环境中应用于支护的可行性，做了4种不同掺量（0、0.2%、0.4%、0.6%）的BF砂浆，采用Φ74mm的变截面霍普金森压杆（split Hopkinson pressure bar, SHPB）装置测试动态抗压强度，万能试验机测试静态单轴抗压强度。对比分析动态抗压强度、极限韧性、峰值应变、动态增长因子，研究BF砂浆的动态力学性能。结果表明，水泥砂浆掺加BF具有较好的抗冲击性能，随着BF掺量的增加，砂浆的峰值应力，极限韧性，峰值应变，动态增长因子均有所提升。BF掺量在0.6%时，相同应变率下的峰值应力最大，80s-1应变率下的峰值应变提升19.26%，在65s-1之后极限韧性提升最大，动态增长因子增加最快。BF掺量越多，砂浆冲击后形成的碎块粒度越大，扫描电镜分析与破坏形态均能说明BF可以在砂浆内部形成良好的约束作用。
In order to study the feasibility of basalt fiber (BF) mortar applied to support in complex underground environment, four kinds of BF mortar with different contents (0, 0.2%, 0.4%, 0.6%) were prepared before testing. The dynamic compressive strength was tested by Φ74mm variable cross-section split Hopkinson pressure bar (SHPB) device. The static uniaxial compressive strength was tested by universal testing machine. The dynamic mechanical properties of BF mortar were studied by comparing the dynamic compressive strength, ultimate toughness, peak strain and dynamic growth factor. The results show that the cement mortar with BF has good impact resistance. The peak stress, ultimate toughness, peak strain and dynamic growth factor of mortar are improved with the increase of BF content. When the BF content is 0.6%, the BF cement mortar has highest peak stress at the same strain rate, and the peak strain increases by 19.26% at 80s-1 strain rate. After 65s-1, the BF cement mortar has highest ultimate toughness and the dynamic growth factor. The more the BF content, the larger the particle size of the fragments formed after mortar impact. Scanning electron microscope (SEM) analysis and damage morphology showed that BF could form a good restraint effect in cement mortar.
王学鹏,王亮,王浩,等. 玄武岩纤维支护砂浆动态力学性能[J]. 科学技术与工程, 2023, 23(30): 13078-13084.
Wang XuePeng, Wang Liang, Wang Hao, et al. Dynamic Mechanical Properties of Basalt Fiber Support Mortar[J]. Science Technology and Engineering,2023,23(30):13078-13084.