Dynamic Properties of sand treated with cement

• Main Authors: Hung-Che Hsiao., 蕭宏哲
• Other Authors: Mr.Chung-Jung Lee.
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/92368937425669878432

碩士 === 國立中央大學 === 土木工程研究所 === 82 === An experimental study of the dynamic properties of Ottawa sand and Ottawa sand treated with different levels of cement is reported. The dynamic shear modulus, dynamic Young's modulus and damping ratio of both Ottawa sand and Ottawa sand treated with different levels of cement are determined by the Drnevich Long-Tor resonant column device. The major parameters studied are confining pressure, strain amplitude and treated level. Increasing trends of both dynamic shear modulus and corresponding unconfined compression strength show that soils treated with cement can effectively improve the soil dynamic properties during earthquake loading or the other dynamic loading. Both dynamic shear modulus and dynamic Young's modulus decrease with increasing the level of strain amplitude. Instead, damping ratio increases with increasing the level of stain amplitude. The maximum values of the dynamic shear modulus for sand specimen occur at the shear strain amplitude of 1.0×10-5 and the maximum Young's modulus of the sand can be obtained at the axial strain amplitude of about 1.0×10-6 . The maximum shear modulus of Ottawa sand treated with different levels of cement is obtained at the shear strain amplitude of 1.0×10-6 and the dynamic Young's modulus occur at the axial strain amplitude of 1.0×10-8. The effect of confining pressure to the dynamic modulus of the treated sand decreases with an increasing degrees of cementation, C%. The maximum dynamic shear modulus and maximum dynamic Young's modulus of the treated sand increase with an increasing degree of cementation, however, the relationship of them is nonlinear. The rates of increment of the dynamic modulus decrease with the increase of degrees of cementation. The maximum dynamic modulus of Ottawa sand treated with cement can be predicted by its unconfined compression strength qu.