Reinforcing of soft cohesive soils with stone columns

The settlement performance of stone column foundations

“…6) failed by bulging. These observations agreed with previous postulations by Wood et al (2000) and Hughes & Withers (1974).…”

“…Laboratory-based research, together with analytical modelling, numerical modelling and field observations, is well documented, and has contributed to improvements in efficiency and quality control (Hughes & Withers, 1974;Hughes et al, 1975;Aboshi et al, 1979;Balaam & Booker, 1981;Barksdale & Bachus, 1983;Charles & Watts, 1983;Alamgir et al, 1994;Hu, 1995;Balaam et al, 1977;Raju, 1997;Slocombe et al, 2000;Watts & Serridge, 2000;McKelvey, 2002;McKelvey et al, 2004;Pulko & Majes, 2005;Black, 2007;Black et al, 2007aBlack et al, , 2007bMcCabe et al, 2009). Stone columns are typically employed to support large raft foundations at relatively low or moderate loading conditions.…”

Numerical modelling of stone columns beneath a rigid footing

“…Hughes and Withers [14]) because in those cases the load is only applied on top of the column, which means an ar=100% and, as discussed later, it is generally less efficient at reducing the settlement.…”

“…This new model is used to study the influence of the area replacement ratio, ar, and the critical column length, which may be defined as the column length beyond which the column does not improve further the soft soil, i.e. it does not reduce further the settlement or improve the bearing capacity [14]. To conclude, some of the findings presented in this paper are applied to a simplified design example.…”

The significance of engineering geology to construction

“…The best results have been obtained in fairly coarse sands which contain little or no silt or clay. Vibroreplacement, in which columns of granular material are placed by vibratory methods are commonly used in soft, normally consolidated compressible clays, saturated silts, and alluvial and estuarine soils (Hughes & Withers 1974). by guest on May 9, 2018 http://egsp.lyellcollection.org/ Downloaded from Dynamic compaction brings about an improvement in the mechanical properties of a soil by the repeated application of very high intensity impacts to the surface (Menard & Broise 1975;Gambin 1987).…”