Soil stabilization

About: Soil stabilization is a research topic. Over the lifetime, 3161 publications have been published within this topic receiving 48437 citations.

Development of stabilised soils for construction applications

Abstract: Lateritic soils from Papua New Guinea were stabilised with various percentages of rice husk ash (RHA), finely ground natural lime, cement and their combinations. The influence of stabilisers and their combinations was evaluated through Atterberg limits, standard Proctor compaction, unconfined compressive strength, splitting tensile strength, modulus of elasticity and California bearing ratio (CBR) tests. The durability of 38 stabilised soil mixtures was also investigated by studying the influence of water immersion on strength, water sorptivity and drying shrinkage. Correlations between compressive strength, modulus of elasticity and CBR were also established. Theoretical analysis of pavements incorporating subgrades improved by stabilised lateritic soils under traffic loads showed technical benefits in comparison with conventional flexible pavements without improved subgrades. Suitable stabilised soil mixtures using RHA, lime, cement and their combinations which can be used for the construction of road p...

Three dimensional slope stability analysis and failure mechanism

Abstract: of thesis entitled THREE DIMENSIONAL SLOPE STABILITY ANALYSIS AND FAILURE MECHANISM submitted by Wen-Bing Wei for the degree of Doctor of Philosophy at The Hong Kong Polytechnic University in July 2008 For slope stability problem, two-dimensional analysis is commonly used for simplicity, though all slope failures are three-dimensional (3D) in nature. There are only limited applications of 3D analysis due to the various limitations of three-dimensional slope stability methods. Recently, there are various important progresses for 3D analysis. 3D limit equilibrium method (LEM) for general asymmetrical problem together with innovative optimization method for locating the general critical 3D failure surface has recently been developed. In addition, 3D strength reduction method (SRM) can now be conducted within a tolerable duration. Until now, there is still a lack of detailed investigation of 3D slope stability failure mechanism and the application of 3D LEM and SRM under different 3D conditions. This study aims to conduct an extensive threedimensional slope stability analysis and to investigate the failure mechanism under different situations. The 3D effect considered in this study includes the important factors such as slope geometry, boundary conditions, water, soil nail and pile. Both the LEM and SRM are conducted in this study, and some interesting differences between these two methods are discovered. It is concluded that both methods have their own merits and limitations, and a good understanding of these methods are required before a good solution can be obtained. The suitability of these two methods under different conditions is investigated and precautions when these methods are applied are suggested. In this study, some results which appear to be different from common understanding are obtained. Some of the results are also different from published studies, and careful investigations have revealed that the present detailed studies have provided a better and more reasonable understanding about the failure and stabilization mechanism. For example, for a simple slope extending to infinity, the critical slip surface is still basically two-dimensional until the external loading is large to induce a threedimensional failure. The failure mechanisms due to the self weight of soil and external loads are actually different. The discretization domain required for SRM analysis is found to decrease with the increase of external loads which is also out of expectation. The distribution of tension force in soil nail is found to be influenced by the state of the slope (service state, limit state) and the failure modes (external failure, internal failure). In general, the line of the maximum tension may not correspond to the critical slip surface as commonly believed, except when the failure mode is an internal tensile failure. For slope supported with one row of piles, the slip surface is divided into two parts when the pile spacing is very small, and these two parts gradually become connected to form a clear single slip surface mechanism with the increase of pile spacing. The point of maximum shear force in the pile which is commonly used to determine the location of the slip surface in traditional design is found to be not a valid assumption, and this is important for design of slopes reinforced with piles. Some engineers have questioned the disturbance of the seepage pattern due to the presence of soil nails and piles. Such blocking effect is however found to be negligible. With the detailed study on 3D failure and stabilization mechanism, a clearer and better understanding of three-dimensional slope failure has been achieved in the present study. LIST OF PUBLICATIONS Wei, W. B., Cheng, Y. M., and Li, L. (2008). Three-dimensional slope failure analysis by the strength reduction and limit equilibrium methods. Computers and Geotechnics, In Press. Wei, W. B. and Cheng, Y. M. (2008). Soil nailed slope by the strength reduction and limit equilibrium methods, submitted to International Journal for Numerical and Analytical Method in Geomechanics. Wei, W. B. and Cheng, Y. M. (2008). Strength reduction analysis for slope reinforced with one row of piles, submitted to Journal of Geotechnical and Geoenvironmental Engineering. Wei, W. B. and Cheng, Y. M. (2008). Stability analysis of slope with water flow by strength reduction method, submitted to Soils and Foundations. Cheng, Y. M., Lansivaara, T., and Wei, W. B. (2008). Reply to Comments on “Twodimensional slope stability analysis by limit equilibrium and strength reduction methods”. Computers and Geotechnics, Vol. 35, No.2, 309-311 Cheng, Y. M., Lansivaara, T., and Wei, W. B. (2007). Two-dimensional slope stability analysis by limit equilibrium and strength reduction methods. Computers and Geotechnics, Vol. 34, No.3, 137-150 Wei, W. B. and Cheng, Y. M. (2007). Strength reduction method for three dimensional slope stability analysis. 60 Canadian Geotechnical Conference and 8 Joint CGS/IAH-CNC Groundwater Conference (Ottawa, Ontario, Canada, October 2124, 2007), 815-820 Cheng, Y. M., Wei, W. B., and Lansivaara T. (2006). Factors of safety by limit equilibrium and strength reduction methods. Numerical Methods in Geotechnical Engineering – Schweiger (ed.), Sixth European Conference on Numerical Methods in Geotechnical Engineering (Graz, Austria, 6-8 September 2006), 485-490

Comparison of lime treatment techniques for deep stabilization of expansive soils

Abstract: In-situ deep Figure 14stabilization of expansive soil deposits is commonly carried out using lime piles and lime slurry injection. Recent research demonstrated the stabilization of expansive soils ...