玄武岩纤维水泥土的冲击劈裂性能试验研究

为了研究玄武岩纤维掺量对水泥土冲击劈裂性能的影响,进行了不同冲击气压条件下水泥土的霍普金森压杆(SHPB)试验。试验结果表明:随着玄武岩纤维掺量的不断增大,水泥土试件劈裂面的破碎程度逐渐变小,吻合程度逐渐变好,但过量的玄武岩纤维具有负面效应,试件冲击劈裂强度和吸收能均出现先提高后降低的趋势,在玄武岩纤维掺量为1.5%时,其冲击劈裂强度和吸收能达到极大值。在玄武岩纤维掺量相同时,水泥土的破碎程度和冲击劈裂强度均随着冲击气压的增大而提高。劈裂强度动态增大系数随着冲击气压的增大不断增大,且增长幅度随着玄武岩纤维掺量的逐渐增大而减小。冲击气压和玄武岩纤维掺量共同影响水泥土的冲击劈裂强度。

Experimental Study on Impact Splitting Performance of Basalt Fiber Cement Soil

In order to study the effect of basalt fiber content on the impact splitting performance of cement soil, the Hopkinson pressure bar (SHPB) test of cement soil under different impact pressure was carried out. The test results show that with the increase of basalt content, the degree of fragmentation of the cement soil specimen becomes smaller and the degree of anastomosis becomes better, but the excessive basalt fiber has a negative effect. The impact splitting strength and absorption energy of the specimens both increased first and then decreased. When the basalt fiber content was 1.5%, the impact splitting strength and absorption energy reached the maximum value. When the content of basalt fiber is the same, the breaking degree and impact splitting strength of cement soil increase with the increase of impact air pressure. The dynamic increase factor of splitting strength increases with the increase of impact air pressure, and the increased amplitude decreases with the increase of basalt fiber content. The impact splitting strength of cement soil is closely related to and affected jointly by the impact pressure and the content of basalt fiber.