000009689 001__ 9689
000009689 005__ 20141205153144.0
000009689 04107 $$aeng
000009689 046__ $$k2008-10-12
000009689 100__ $$aChen, Guo-Xing
000009689 24500 $$aDynamic Stress-Strain Relationship of Nanjing Flake-Shaped Sand under Cyclic Loading

000009689 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000009689 260__ $$b
000009689 506__ $$arestricted
000009689 520__ $$2eng$$aComparing with the common quartz sand soils composed of the circular-shaped particle, the flake-shaped sand soils have remarkable differences in physical mechanics properties. With the dynamic pore-water pressure rising, the stiffness degradation of saturated sand soils is caused under cyclic loading. And liquidation of saturated sand soils is triggered when the dynamic pore-water pressure accumulates to some level, so that soil structure is broken down. Considering different static deviator stress levels, axial cyclic stress ratio levels and the number of cycles, a series of dynamic stress-strain relationship tests of Nanjing flake-shaped sand were performed by using the WFI cyclic triaxial apparatus made in England. It is observed that initial static deviator stress levels, axial cyclic stress ratio levels and the number of cycles have marked effect on stress-strain relationship of Nanjing flake-shaped sand. By considering the properties of secant shear modulus in each unload-reload loop of dynamic stress-strain relationship, an empirical equation on degradation of secant shear modulus is established based on series of test results. The static deviator stress level has remarkable effect on the degradation of shear modulus. With the numbers of cycles increasing, the stress-strain hysterisis loops separate each other gradually and the stress-strain hysterisis loops are leaning gradually towards the coordinate axis of strain. In addition, based on the empirical equation of shear modulus degradation, the dynamic stress-strain relationship of Najing flake-shaped sand was described by using modified Masing’s rule.

000009689 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000009689 653__ $$acyclic loading, flake-shaped sand, dynamic stress-strain relationship, degradation of dynamic shear modulus 

000009689 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000009689 720__ $$aChen, Guo-Xing$$iLiu, Xue-Zhu
000009689 8560_ $$ffischerc@itam.cas.cz
000009689 8564_ $$s215114$$uhttps://invenio.itam.cas.cz/record/9689/files/12-03-0014.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 12-03-0014.
000009689 962__ $$r9324
000009689 980__ $$aPAPER