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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). [ABSTRACT FROM AUTHOR]

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A generalised influence function method is introduced using tabulated weighting factors in subsidence calculation. Tabulated weighting factors have the advantage of being more flexible than having to find a mathematical influence function. The values of weighting factors can be readily adopted either using a local observational database if available, or a published data source. The flexibility and adoptability of the method is demonstrated through a case study with subsidence contours, movement vectors and principal strains. It is also demonstrated that the method is a valuable tool in assessing subsidence effects on surface structures and utilities. [ABSTRACT FROM AUTHOR]