Ground Improvement Techniques Applied To Very Soft Clays: State Of Knowledge And Recent Advances
Soft ground improvement techniques have evolved substantially in Brazil in recent years. However, their application in soft and very soft clays requires a good understanding of the fundamentals of ground improvement techniques suited to the problem as well as the actual field behavior when implemented on a real scale. This paper describes some of the […]
Estudo De Modelação Da Consolidação Acelerada Por Drenos Verticais Tomando Em Consideraçao A Fluencia Do Terreno
Com o objectivo de entender a importância da fluência em solos argilosos moles e de como este fenómeno é modelado numericamente foi feito um estudo comparativo de modelação de um ensaio edométrico tradicional usando os modelos Soft Soil (SS) e Soft Soil Creep (SSC) do programa PLAXIS. Sobre uma amostra de solo mole proveniente dos […]
Vacuum Preloading And Pvds In Soft Soils Beneath Embankments: 3D Coupled Analysis Incorporating Overall Stability Study
Although embankments on soft soils with prefabricated vertical drains (PVDs) under vacuum preloading have been widely studied, there is a lack of studies in the literature in which overall stability is analysed through three-dimensional (3D) mechanical-hydraulic coupled modelling. In order to contribute to overcome such deficiency, this paper presents 3D numerical analyses of an embankment […]
Large Scaled Field Tests On Soft Bangkok Clay (4Th Victor De Mello Goa Lecture)
In this lecture the interpretations of fully instrumented tests embankments and their role in the development of appropriate ground improvement techniques for highways, motorways and airfields on soft clay deposits is illustrated through well documented case studies in Bangkok, Thailand and Muar Flat Site in Kuala Lumpur. For the Bangkok Plain and with sand backfills […]
The Interaction Between Reinforcement And Vertical Drains And Effect On The Performance Of Embankments On Soft Ground
This paper reviews the behaviour of reinforced embankments on soft ground. Case of the Almere test embankment is used as an example to demonstrate the key function of reinforcement in improving the performance of embankments on soft foundation. The effects of partial drainage are summarized for reinforced embankments and contrasted the results from undrained analyses […]
Working Hypothesis, Special Laboratory Tests, Working Tools, Analysis Of The Monitoring Of A Pilot Embankment Built On Soft Clay In Santos With Wick Drains And Its Application To The Final Design
Routine in-situ and laboratory investigations carried out for the basic design failed to provide reliable values for compressibility and consolidation parameters of soft clay layers at the site of a terminal to be built in Santos. A pilot embankment was designed and built divided in three equal areas, two with wick drains in a square […]
Analysis And Control Of The Stability Of Embankments On Soft Soils: Juturnaíba And Others Experiences In Brazil
In the design and evaluation of the behavior of embankments on soft clay foundations, geotechnical characterization, along with instrumentation for measurements involving pore pressure and displacements (vertical and horizontal), are required in order to efficiently elaborate a construction. This paper presents the results of stability analysis, and stability control, with emphases on studies carried out […]
Monitoring And Performance Of Embankments On Soft Soil: JuturnaãÂba Trial Embankment And Other Experiences In Brazil
The accurate performance of instrumentation is fundamental to the adequate use of the results obtained from analyzing the behavior of constructions of embankments on soft soils. When evaluating embankment behavior, the geotechnical instrumentation for pore pressure and vertical and horizontal displacements measurements can be an extremely useful tool, including when there are adjacent structures. This […]
Soft Soils Improved By Prefabricated Vertical Drains: Performance And Prediction
The use of prefabricated vertical drains with vacuum preloading and surcharge preloading is now common practice and is proving to be one of the most effective ground improvement techniques known. The factors affecting its performance, such as the smear zone, the drain influence zone, and drain unsaturation, are discussed in this paper. In order to […]
Behaviour Of Three Test Embankments Taken To Failure On Soft Clay
This article compares and analyses the behaviour of three test embankments. The soil foundation consisted of normally consolidated clay overlain by a thick sand surface layer. The embankments were rapidly constructed until failure, which occurred after approximately 50 days. Two of the embankments were reinforced, one including prefabricated vertical drains (PVD), while the third had […]
Effects Of An Abutment Construction On Soft Soil On A Neighbouring Structure: Influence Of Different Construction Techniques Using Geosynthetics
The topographic and geological conditions of several regions in Brazil favour the formation of large deposits of soft soils. Sometimes this requires the use of innovative techniques to allow constructions of geotechnical works in these sites. The presence of deep soft foundation soils has led to an increasing number of reinforced bridge abutments being built […]
Avaliação Da Eficiência Da Técnica De Cpr Grouting No Enrijecimento De Solos Compressíveis
A técnica de CPR Grouting consiste no bombeamento de argamassa no interior da camada de solo mole sob elevadas pressões, com geodrenos colocados previamente entre as zonas a injectar. O tratamento resulta na diminuição do índice de vazios da camada compressível e no aumento da resistência, conduzindo a uma redução significativa dos recalques. O presente […]
