土工合成纤维土动力特性试验研究

通过动三轴试验,研究围压、纤维长度、纤维细度和配合比等因素对聚丙烯纤维加固粉砂的动应力-应变关系及动强度的影响规律。结果表明:纤维土的动应力-应变关系呈应变硬化型,近似双曲线;围压对纤维土动应力-应变关系和动强度的影响较大,纤维土的动弹性模量和动强度随围压的增大而增大,随振动次数的增加而降低;纤维越细,动强度越大,抵抗变形的能力越强;纤维的掺入对土体动摩擦角的影响不大,主要提高了土的动黏聚力。

Experimental study on dynamic characteristics of TEXSOL

Through dynamic tri-axial test, the influences of the confining pressure, fiber length, fiber fineness and mixture ratio on the dynamic stress-strain relationship and dynamic strength of silty soil reinforced by polypropylene fiber were researched. The results show that the dynamic stress-strain relationship of TEXSOL is of the strain hardening type with the shape of near hyperbola. The influence of confining pressure on the dynamic stress-strain relationship of TEXSOL is great. The dynamic elastic modulus and dynamic strength of TEXSOL will increase with the increase of confining pressure,and decrease with the increase of vibration time. The finer the fiber is, the higher the dynamic strength and the ability to resist deformation are. The fiber can improve the dynamic cohesive force of soil, however it has little effect on soil friction angle.