NUMERICAL ANALYSIS ON THE EFFECT OF JET GROUT PILES ON AN EXCAVATION LOCATED IN AN URBAN AREA
Keywords:
Jet Grout Piles, Sloped excavation, Peaty clay, Impact studyAbstract
The development of infrastructure in limited land space is a challenging scenario. Infrastructure in
limited land space regions (e.g. Singapore) does not provide freedom to develop at favourable locations instead
forces the engineer to design at the possible locations. Clay with high organic content, commonly referred as
Peaty clay is predominant in coastal areas. This clay being highly acidic (PH>7) and possessing very low shear
strength is a critical factor to the design of infrastructure in the vicinity. Ground improvement adopted weak
strata will have varying effect and may not be able to achieve the required strength. This paper discusses the
effect of ground improvement (Jet Grout Piles) on the sloped excavation predominantly in Peaty clay. A 15m
deep excavation which is 60 m wide is used for the Finite element modeling. Impact study on a tunnel located
40m from the excavation is presented (The study is carried out for various achieved Jet grout piles strengths of
100, 200, 300, 400 and 500 kPa). The stability of the slopes for the various strengths is also discussed (GeoSlope
was used as the medium to perform the geotechnical analysis).