Experimental Study on the Liquefaction Characteristics of Basalt Fiber-Reinforced Saturated Sand

To study the liquefaction characteristics of fiber-reinforced saturated sand, a serious of cyclic triaxial tests were carried out and analyzed the influences of basalt fiber content (FC = 0, 0.2%, 0.4%), cyclic stress ratio (CSR = 0.30, 0.35, 0.40), loading frequency (f = 1, 3, 5 Hz) on the excess pore water pressure (EPWP) characteristics, and the liquefaction resistance of saturated sand and basalt fiber-reinforced saturated sand. The dynamic strength curves of saturated sand and basalt fiber-reinforced saturated sand were discussed. The research results show that the addition of basalt fiber can effectively inhibit the generation and accumulation of excess pore water pressure (EPWP) and improve the liquefaction resistance of saturated sand. As the basalt fiber content increases, the liquefaction resistance of fiber-reinforced saturated sand increases, and the optimal basalt fiber content is about 0.4%. The greater the cyclic stress ratio (CSR) and loading frequency, the more likely the saturated sand is to undergo liquefaction failure. The excess pore water pressure ratio (EPWPR) of saturated sand and basalt fiber-reinforced saturated sand correlated with the hyperbolic model. The dynamic strength curves of saturated sand and basalt fiber-reinforced saturated sand conformed to the power function’s change form.