聚丙烯纤维-水泥基稳定土抗剪强度试验研究

为了分析聚丙烯纤维物理加筋和水泥化学加固作用对土体抗剪强度的影响，通过直接剪切试验，研究了不同纤维、水泥和河砂掺量对纤维-水泥基稳定土试样抗剪强度指标的影响规律。结果表明:①试样的剪应力与剪切位移关系曲线呈非线性关系，试样的抗剪强度与法向应力成正比关系；②随着水泥和纤维掺量的增加，试样的黏聚力和内摩擦角不断增大，并且大致呈线性增长趋势；③随着含砂量的增加，纤维-水泥基稳定土试样的黏聚力大致呈现先增加后降低的趋势，最大值出现在含砂率为4%时，这表明在纤维-水泥基稳定土中，掺加适量的砂不仅不会降低试样的黏聚力，反而对黏聚力提高有一定的帮助。

Experimental Study on Shear Strength of Polypropylene Fiber-cement Based Stabilized Soil

In order to analyze the effect of polypropylene fiber physical reinforcement and cement chemical reinforcement on shear strength of soil, direct shear tests were carried out to study the effect of different fiber, cement and river sand content on shear strength index of fiber-cement based stabilized soil specimens. The test results show that:①the shear stress shear displacement relation curve of the specimen has a nonlinear relationship and the shear strength of the specimen is in direct proportion to the normal stress; ②with the increase of cement and fiber content, the cohesive and the internal friction angle of the specimen are increasing and the trend is linearly increasing; ③with the increase of sand content, the cohesive of the fiber-cement based stabilized soil specimen increases first and then decreases and the maximum value occurs when the sand content is 4%, which indicates that adding a proper amount of sand will not decrease the cohesive force of the soil but will help to improve the cohesive.