Experimental study on mechanical property of different cement-soils

Abstract

The stress-strain curve, the unconfined compressive strength (UCS) of different cement-soils and the influence of the surface roughness on the UCS of the silt cement-soil were obtained, using the laboratory test. Test results indicate that comparing with other four kinds of cement-soil (the silver sand cement-soil, the silt cement-soil, the clay cement-soil and the muck cement-soil, respectively), the peak strain of the gravel cement-soil is smaller, the values of which are about 0.01, whereas the strain of other four cement-soils are about 0.016 to 0.03, suggesting that the gravel cement-soil is in a brittle failure state and has a worse ductility. Furthermore, the UCS of the cement-soil increases significantly with increasing curing time throughout a curing period of 60 days, after which the increased trend becomes smaller. In addition, the UCS of the cement-soil increases remarkably within a certain amount of cement content. For the silver sand cement-soil, the muck cement-soil and the gravel cement-soil, this amount is 10% to 15%, whereas the amount of cement content is 15% to 20% for the silt cement-soil. The UCSs of the silt cement-soil with a curing time of 28 days and both sides unoiled are larger than those with both sides oiled, and the values of the strength ratio are about 1.1 to 1.2.

Experimental Research on Lateral-Load Behavior of Large Diameter Drilled Shaft under Axial-Load

“…Many researches and practices hold the opinion that post-grouting drilled shaft can enhance not only axial but also lateral capacity of foundation piles [1][2][3][4]. Pile foundations are usually used to bear vertical and horizontal composite loads in the engineering, such as harbors, bridges, retaining structures, high-rise tower buildings and marine drilled platforms.…”