高边坡防护中BFRP锚固结构的振动台试验

Shaking table test of traditional anchorage and BFRP anchorage in high slope protection

通过振动台试验,对钢锚杆(索)与玄武岩纤维塑料增强筋(BFRP)锚杆(索)的应变峰值分布规律进行了分析,并利用小波包工具对不同频带下锚杆(索)的应变响应情况进行研究。试验结果表明:(1)BFRP锚杆(索)与坡体协同变形的效果较钢锚杆(索)更加明显;(2)BFRP锚杆(索)上的应变值均要大于钢锚杆(索)上对应测点的应变值,且单独对钢锚杆(索)及BFRP锚杆(索)而言,锚杆(索)端部处的应变值均要大于锚杆(索)尾部处的应变值;(3)对应变起影响作用的主要频段为第一频带(0.1~6.26 Hz)和第二频带(6.26~12.51 Hz),土体对于高频(12.51 Hz以上)地震波的吸收比较明显。其研究结果可为BFRP锚杆(索)加固高边坡的动力合理性设计提供科学依据。

The peak strain distribution law of steel anchor(cable)rod and basalt fiber reinforeed plastic(BFRP)anchor(cable)rod was analyzed by the shaking table test,and the strain response of anchor(cable)under different frequency bands was studied by using wavelet packet tool.The results showed that:(1)The synergistic effect of BFRP anchor(cable)rod and slope was more obvious than that of steel anchor(cable)rod;(2)The strain values on the BFRP anchor(cable)rod were larger than those on the corresponding point of the steel anchor(cable)rod.Furthermore,for steel anchor(cable)and BFRP anchor(cable)rod,the strain value at the head of the anchor(cable)rod was larger than that at the end of the anchor(cable)rod.;(3)The main frequency bands that affected the strain were the first frequency band(0.1~6.26 Hz)and the second frequency band(6.26~12.51 Hz).The absorption of high frequency(above 12.51 Hz)seismic waves were obvious.The research results can provide scientific basis for the dynamic rationality design of BFRP anchor(cable)rod reinforcement of high slope.