关键词: 淤泥, 现场水泥土, 龄期, 力学性质

Abstract:

The investigation into the mechanical properties of field soil-cement mixed with silt or mucky soil can di-rectly provide useful data for the design and construction of soil-cement mixing piles in the Delta of the Pearl River. In this paper,the field soil-cement with one-day age was drilled and sampled. The samples were then cured for dif-ferent ages,followed by the measurements of the physical and mechanical properties,including the unconfined compression strength,the shear strength and the compression modulus. Therefore,the growth laws and influencing factors of the strength of field soil-cement were obtained,thus coming to the conclusion that the unconfined com-pression strength of the field soil-cement obviously increases with the age to about half of that of the soil-cement pre-pared in laboratory at the age of 28 days,that the compressive coefficient of the field soil-cement mixed with silt reaches a medium degree at the age of 28 to 90 days,namely,0.1 to 0.4 MPa^-1,and that the unconfined compres-sion strength of the field soil-cement is 0.4 to 1.1 MPa at the age of 90 days,which is 20.9 to 57.6 times that of
the undisturbed soil.

Key words: silt, field soil-cement, age, mechanical property