Abstract A series of laboratory dynamic triaxial tests are carried out to study the dynamic strength properties of lightweight clay mixed with expanded polystyrene beads soil(LCES). Firstly，the material will be in failure when the compressive strain reaches 5%，which can be considered to be a suitable dynamic failure criterion of LCES，and then the effort is focused on the confining pressure，cement content and EPS content effect on the dynamic strength properties of LCES. The test results indicate that the dynamic strength of LCES increases with the increasing confining pressure and cement content，however，the effect of confining pressure on the dynamic strength declines when the cement content increases. The dynamic strength of LCES initially increases and then decreases with the increase of EPS content，so LCES may has an optimal EPS content for the dynamic strength. Cement and EPS have considerable effects on the increase of the dynamic strength paramete of LCES，but they have few effects on the increase of the parameter jd. The relationship of dynamic shear strength and cyclic number(td-Nf) can be simulated by the power function properly. By considering synthetically the influences of confining pressure，cement content and EPS content，dynamic shear strength curves of LCES are normalized，and the dynamic strength formula is obtained.
|
|
Received: 06 July 2006
|
|
|
|
