纤维加筋黄土的抗剪强度特性研究

Fiber Reinforced Soil Shear Strength of the Experiment Research

通过直接剪切试验研究了不同含水率、不同纤维量、不同压实度纤维加筋黄土的黏聚力、内摩擦角和抗剪强度的变化规律。研究结果表明:含水率由14%增加到18%时,黄土的黏聚力逐渐减小,当其大于20%时,黏聚力c急剧减小;当黄土的含水率为18%时,内摩擦角φ最大,黄土的抗剪强度达到最大值;纤维材料在黄土中呈面状、网状和团状分布,内摩擦角和黏聚力均随纤维量的增大先增大后减小,纤维量0.5%为最优纤维量;纤维含量小于最优纤维量时,内摩擦角随压实度的增大变化较小,当纤维含量大于最优纤维量时,内摩擦角变化较大;同时,在实际应用方面,该试验给出了含水率、纤维量和压实度与内摩擦角和黏聚力的函数关系,对黄土地区施工具有指导意义。

This paper studied different water content and different fiber content and different degree of compaction of fiber reinforced loess cohesion, internal friction angle and shear strength variation by direct shear test. The results show that： the moisture content increased from 14 % to 18%, the cohesion of loess decreases when it is greater than 20 %, the cohesion decreases rapidly; when the moisture content is 18 %, the maximum internal friction angle and the shear strength reaches the maximum valuel fiber materials in the surface, mesh and clumped distribution in loess soil, cohesive strength and internal friction angle increases with increasing fiber content increased first and then decreased. The amount of fiber is 0. 5% of the optimal amount of fiber; fiber content is less than the optimal amount of fiber, increase the small change of internal friction angle with the degree of compaction, when the fiber content is larger than the optimal amount of fiber, the internal friction angle changes greatly; at the same time, in the actual application in this experiment, the relationship between moisture content, fiber content and compaction degree, internal friction angle and cohesive force is given, which is of guiding significance to the construction of loess area.