Foundation security stability is an urgent problem in engineering practice.Therefore

the study of sand and soil layers’ micro-macro mechanical characteristic at different stress conditions which would affect foundation security shows a great importance.In this paper

bender element technique would be used to monitor the evolution of soil’s shear wave velocity and compressional wave velocity under one-dimensional compression condition.And the feasibility of bender element technique at different soil condition would be researched by making a comparison of bender element signal between sand and soil.The results showed that bender element technique could greatly monitor the process of particle crushing under high one-dimensional compression

mechanical behavior of rubber-sand mixture and soil’s strength change during consolidation process.And the optimal parameters about bender element at different soils have been determined.