纤维增强水泥土力学性能试验研究

Experimental Research on Mechanical Properties Reinforcement of Cement Soil with Fiber

纤维加筋技术是一种新式的改良土体方法,能够有效地提高土体力学性能。选取聚丙烯纤维和水泥作为加筋稳定材料,将纤维的物理加筋作用和水泥的化学加固作用相结合,开展无侧限抗压强度(UCS)试验,研究了纤维加筋稳定土的强度力学特性与应力-应变性状。通过试验,研究了不同水泥掺量(6%、8%、10%)、纤维掺量(0.15%、0.3%、0.45%)及不同龄期(3 d、7 d、14 d)对试样强度的影响。试验结果表明,水泥和纤维的掺入均能够提高土体的强度,纤维的加入使纤维加筋水泥土试样由脆性破坏模式向塑性破坏模式转变。

Fiber reinforcement technique is a new method to soil improvement,which can improve the mechanical properties of soil effectively. Unconfined compression strength（ UCS） tests have been made to investigate strength characteristics and the stress-strain behaviors of composite soil by combining polypropylene fiber reinforcement and cement. Based on the UCS tests,the influences of different cement contents（ 6%,8%,10%）,different fiber contents（ 0. 15%,0. 3%,0. 45%）,and different curing ages（ 3 d,7 d,14 d） are studied. The test results show that both the cement and polypropylene fiber can improve the unconfined compression strength of fiber reinforce soil. The inclusion of polypropylene fiber can change the brittle behavior of cement soil to the ductile behavior.