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通过无侧限抗压强度试验,分析探讨了纤维EPS(expanded polystyrene,EPS)颗粒轻质土的强度-变形特性、受压破坏模式、无侧限抗压强度的影响因素。结果表明:EPS颗粒、纤维、水泥掺量不同,纤维EPS颗粒轻质土应力-应变曲线存在差异;EPS颗粒和水泥掺量是强度的主要影响因素,纤维掺量影响其次;强度随EPS掺量增大而显著降低,随水泥掺量增大而显著增大;未加纤维的EPS颗粒轻质土有掉块或松散破碎现象,强度骤然丧失;添加纤维,能提高峰值强度、残余强度,增加轻质土整体性和韧性,改善其脆性破坏模式;但EPS掺量较高(>3%)时,纤维与水泥土粘结有限,轻质土力学性能改善较小。运用扫描电镜(SEM),从微观层次上分析了纤维EPS颗粒轻质土的力学机制,发现EPS颗粒为空心蜂巢结构,纤维表面布满针状的水泥水化物,这些对轻质土力学性能有直接影响。
Based on the unconfined compressive strength test, the strength-deformation behavior, compressive failure mode and unconfined compressive strength of light weight soil with expanded polystyrene (EPS) particles were analyzed. The results show that the different EPS particles, fibers and cement contents have different stress-strain curves. The EPS particles and cement content are the main influencing factors of strength, the fiber content affects the second, and the strength of EPS particles Increase with a significant increase in cement content increased significantly increased; non-fiber EPS particles light soil with block or loose broken phenomenon, the sudden loss of strength; add fiber, can increase the peak intensity, residual strength, increase The integrity and toughness of light soil are improved, and the brittle failure mode is improved. However, when the content of EPS is higher (> 3%), the bond between fiber and cement soil is limited, and the mechanical properties of light soil are improved little. Scanning electron microscopy (SEM) was used to analyze the mechanical mechanism of lightweight EPS-EPS from microcosmic level. It was found that the EPS particles are hollow honeycomb structure, and the fiber surface is covered with acicular cement hydrate. These mechanical properties of light-weight soils direct impact.