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Soil stabilisation: Research and Practice (Influence of sand impurties in…
Soil stabilisation: Research and Practice
Introduction
Soil stabilisation
Chemical and physical alteration
Chemical: adding cement to bond the particles together
Adding in the missing grain size to achieve well graded sand
Background
Soil stabilization important
Improve on the soil shear strength
Especially for Underground construction
Common in city state like Singapore
(due to insufficient land space)
This type of construction produce a lot of waste soil
Find a way to improve it
developing a model to predict the cement dosage
Eg: of underground construction: Subway, basement and underground passageway
underground construction typically cause a lot of ground movement
There is a need to treat the surround soil
Especially at area with building next to it
For example woodland south MRT station
Ground consist of granite type 2
Construction still cause adjacent building to unevenly settle
Highlight the fact that settlement is OK. as long as the building settle evenly
Research
Existing method used for ground improvement(practice)
Deep soil mixing
Jet grouting piles
Micro piles
Existing model use to predict the cement dosage
Most construction by-product consist of mixture of clay, sand gravel
Research on how cement can improve on the shear strength of the soil
Type of cement use
OPC
Blast Furnace Cement
Temperature of curing
Water to cement ratio
Type of soil
In term of whether is it well-graded
introduce the missing grain size to make it well graded
Ph value of the soil
The PH is too acidic (treat the soil to neutralise the soil acidity)
Influence of sand impurties in cement-treated clays
Land reclamation required low cement dosage
Soil is hetergeneous
W/C (water Cement ratio)
Soil to cement ratio
Introduction