Analysis of numerical model parameters for dry-mixed soil-cement composite with high content of organic matter

Abstract

Numerical modelling of geotechnical issues requires basic subgrade parameters which need to be introduced into the program. The best way of collecting such information is to commission a series of tests. Defining the parameters of the material gained when admixtures are introduced into existing soil becomes problematic. Basic strength parameters can be found from trial batches of quasi-concrete composite, however they do not ensure the full spectrum of necessary data. Numerical programs often require more parameters from the user and these data are dependent on the strength hypothesis assumed. In this situation, one of possible solution is to run a inverse analysis. The paper provides exemplary procedure of iterative determination of cohesion, internal friction angle and Poisson’s ratio for a soil-cement sample obtained in dry mixing procedure. The original soil contained relatively high content of organic parts in dry mass. The analysis was made for hypothesis of Coulomb-Mohr and Drucker-Prager. The conclusions drawn from performed studies give some recommendations, but, due to possible soil heterogeneity, emphasise the need for further studies.

Comparison of Settlements of Buildings on Soil-Cement Soil Bases Determined Analytically and by Long-Term Geodetic Observations

“…Various sufficiently reliable and economic technological and constructive solutions for construction under similar complex engineering and geological conditions have been well tested by geotechnicians. In particular, due to the economy and convenience of the manufacturing technology directly on the construction site vertical soil-cement elements (SCE) and soil-cement piles (SCP), manufactured by jet (Deep Mixing, Jet Grouting technology) [8] or drilling [9] methods, which are effective in layers of weak [10], alluvial, organic [11], man-made soils with thickness up to 30 m [12], have gained wide popularity.…”

Virtual Prototyping of the Cement Transporter Including Strength Criterion Based on Geotechnical Boundary Conditions

“…Classic (dry) solidification consists in mixing the subsoil with a binding agent (e.g., cement, cement-ash mixtures) without additional water. This treatment, applied in most cases on organic soils [1], allows the soil to dry (due to the dehydration process) and then bind.…”