Comparative Experiment Research On Dynamic Behaviors Of Lightweight Sand-EPS Beads Soil With Sand

Lightweight Soil is a kind of new soil engineering materials. It is invented and developed by Japan from 1980s. It has many merits such as lightness, great changeabilities of strength and density, fluidity, self-support, simpleness of construction, protection of environment, cheapness. It has been wildly applied in many engineering at home and abroad, such as soft foundation treatment, slope fill, solve of vehicle jump phenomena at bridge head, backfill of pipelines, highway broadening, and so on. Lightweight Sand-EPS beads Soil (LSES) is a kind of Lightweight Soil. In this essay, comparative experiment research on dynamic behaviors of Lightweight Sand-EPS beads Soil with Sand is taken. Major work is as follows:(1) Simple introductions are taken about testing instrument, material and mixing proportion. The establishment of comparability is expounded in particular, that is principle of dry density controlling. Also, the processes of specimen preparing and test are introduced in detail.(2) The data processing methods are advanced to solve the irrationality of original points. Plastic deformation correction is advanced to evaluate the dynamic elastic modulus and equivalent damping ratio of LSES.(3) Comparative research on dynamic deformation behaviors of LSES with sand is taken about the curves of dynamic stress-dynamic strain, dynamic elastic modulus and equivalent damping ratio. Experiment research results indicate that:① E_d (dynamic elastic modulus) of LSES and sand both decrease with the increase of strain. E_d of LSES with different contents of cement and EPS beads are all larger than that of sand. E_d of LSES is similar to sand with low contents of cement and high contents of EPS beads, and will be larger with higher contents of cement and lower contents of EPS beads. E_d of LSES and sand both increase with σ_c (confining pressure), but the influence of σ_c to LSES is more notable.② D (equivalent damping ratio) of LSES and sand both increase with strain. D of LSES approximates to that of sand when content of cement is low, and is smaller...