纤维EPS轻质土抗压与动变形性能分析

Analysis of Compressive and Dynamic Deformation Performance of Fiber EPS Lightweight Soil

通过无侧限抗压强度试验与动三轴试验研究EPS掺量、纤维掺量以及水泥掺量对纤维EPS轻质土力学特性的影响。结果表明:纤维EPS轻质土的无侧限抗压强度和水泥掺量呈正相关,和EPS掺量呈负相关。纤维的加入提高了试样的无侧限抗压强度峰值、残余强度和整体性。纤维掺量大于0.3%时,提升效果减弱。纤维EPS轻质土的动应力应变曲线表现为非线性上升;相同动应力和围压下,EPS掺量越大,试样的动应变越大;动弹性模量随EPS掺量增加而降低,随动应力的增加逐渐降低,围压的升高增加了试样的刚度。

The effects of EPS content,fiber content and cement content on the mechanical behavior of fiber EPS lightweight soil were studied by unconfined compressive strength test and dynamic triaxial test.The consequences show the strength of fiber EPS lightweight soil is positively correlated with cement content,and negatively correlated with EPS content.The addition of fiber increases the maximum strength residual strength and integrity.When the fiber content is greater than 0.3%,the lifting effect is weakened.The dynamic stress-strain curve of EPS lightweight soil shows a nonlinear rise.Under the same dynamic stress and confining pressure,the dynamic strain of the sample rises with the increase of EPS content.The dynamic elastic modulus declines with the rise of EPS content,and gradually declines with the rise of dynamic stress.The rise of confining pressure increases the stiffness of the sample.