Dynamic Characters of Nanjing Sand,GuanZhou Sand ,Harbin Sand and Lanzhou Sand Compared with Fujian sand

Abstract eng:
Nanjing sand,Guangzhou sand, Nanzhou and Yincuan sand ,Harbin sand are studied on minerals composition, grain style and dynamic shear characters by shake table tests and dynamic tri axial tests. Compared with round sand , dynamic shear mould and extra-pore-pressure of different structural sands, such as schistose,staff grain sand and other non-regular grain sand, are analyzed. The critical shear strain to induce extra-pore-pressure is suggested as a important and effective variable to study structural sands, Referring the dynamic shear dilatancy deformation model of round grain sand, some coefficients of time-dimension-discrete sand dynamic dilatancy model and parameters of elastic-plastic deformation constitutive model are suggested to think of sand structural characters. A simplified dynamic shear deformation equation for typical structural sand is suggested to analyze earthquake engineering problems.

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