Ground Improvement Case Histories and Advances in Practice

Varaksin, Serge; Hamidi, Babak

doi:10.3850/978-981-07-3559-3_103-0002

Cited by 5 publications

(9 citation statements)

References 3 publications

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“…For DR columns in clayey and silty medium stiff and disturbed soils, Kumar [4], as well as Varaksin and Hamidi [19], obtained columns with diameters only up to 1.25 to 1.41 times larger than the diameters of the pounders. In the soils with some organic content, characterized by lower strength and stiffness, the noted diameters of the columns were approximately up to 2.4 times larger than the diameters of the pounders [26].…”

Section: Literature Reviewmentioning

confidence: 87%

“…Depending on the approach, it can be classified into two groups. One involves case studies providing only the basic information on the diameters and lengths [4], [18][19][20][21], where the diameters were usually measured at the terrain level. The second group is less numerous and comprises articles where the column shapes and dimensions are determined directly from the measurements of the excavated columns [15], [22][23][24][25], or indirectly from penetration tests [5], [26] or geophysical survey [27].…”

Section: Literature Reviewmentioning

confidence: 99%

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Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Kwiecień

Kowalska

2023

Architecture, Civil Engineering, Environment

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Dynamic replacement (DR) is a ground improvement technique that has been used now for almost 50 years. During the formation of a DR column a crater is created which is then filled with a coarse material and compacted again. The length, diameter and shape of such a column cannot be observed directly, which makes the design and execution more troublesome. In the article presented are the dimensions and shapes of 18 columns from eight different test fields. They were formed by means of pounders of various masses (9 or 11.5 Mg) and dimensions (1.00 or 1.05 m in diameter, 1.8 or 2.0 m in height). Based on the observations and measurements, it was concluded that the shape and diameter of a DR column is influenced by the parameters of the soft soil that is supposed to be improved (its thickness, physical state and location in the profile), as well as by the diameter of the pounder. It was revealed that, as the length of the columns increased, the column shapes changed from: a cylinder, through a truncated cone, a barrel to an asymmetric barrel. The diameters of all of the columns were 1.4–2.8 times larger than the diameters of the used pounders and the largest values were noted along the depth of the weakest layer. The presented results may be useful to the profession. When the thickness of the weak soil, its type and state are known and the technological parameters are similar to the ones presented in this paper, it is possible to predict the shape and diameter of the columns depending on the diameter of the pounder.

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Section: Literature Reviewmentioning

confidence: 87%

Section: Literature Reviewmentioning

confidence: 99%

Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Kwiecień

Kowalska

2023

Architecture, Civil Engineering, Environment

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“…Костенко (г. Караганда, Казахстан) с целью изучения зависимости врезания фундаментов конической фор-мы с разными углами врезания, конических фундаментов с выступаю-щей пятой, конических фундаментов с совмещенной сваей-стойкой и столбчатого фундамента от величины горизонтальных деформаций растяжения земной поверхности (рис. [1][2][3][4][5][6][7][8] Методика исследований заключалась в следующем: на террито-рии земной поверхности, где оказались сдвижения и деформации от выемки угольных пластов, были установлены исследуемые фундамен-ты, модель здания. Организована наблюдательная станция с целью по-лучения необходимых данных о сдвижении деформации земной по-верхности.…”

Section: методика исследованияunclassified

“…времени возведения сооружения и длительности деформационного воздействия подрабатываемого основания, соответствуют реальным условиям взаимодействия сооружения и подрабатываемого основания [1][2][3].…”

Section: Introductionunclassified

Field tests of perspective constructions of conic foundations under coal field of Karaganda conditions

Zhussupbekov¹,

Bazarov²,

Konakbayeva³

2014

PNRPU CA Bulletin

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КАРАГАНДИНСКОГО УГОЛЬНОГО БАССЕЙНАРассматриваются полевые испытания конических фундаментов на подрабатываемых территориях Карагандинского угольного бассейна. Данные натурных испытаний штампа, имити-рующего работу столбчатого фундамента, и конических фундаментов показали, что в упругой стадии работы грунтового основания зависимость осадки от нагрузки одинаковая для обоих ви-дов фундаментов, так как стартовые площадки нагружения их эквивалентны и равны. Однако по мере подработки основания несущая способность у конических фундаментов становится боль-ше, чем у столбчатых фундаментов.Ключевые слова: конический фундамент, натурные испытания, грунтовые основания, здание, подработка, деформация.

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“…Figure 1 shows the comparison between pile and rigid inclusion system. Further comparison between rigid inclusion and pile is discussed in [5]. Resistance is provided by the soil resistance and inclusions via arching effect developed in the load transfer platform (adapted from [3]).…”

Section: Introductionmentioning

confidence: 99%

Heave Analysis of Unreinforced Inclusion Column in Low Sensitivity Soft Clay

Oetomo,

Putra

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The ground improvement technique with inclusions, is now widely available and used in Indonesia. Typically, it uses unreinforced concrete/mortar columns, commonly referred as rigid inclusions, for enhancing the composite ground engineering properties. Using this approach, the applied load will be distributed to both the rigid inclusions and in-situ soft soil. On the surface, this technique is analogue to compression-only cast-in-situ deep foundation element (i.e., bored pile), but with different design concept. Nonetheless, when these inclusions are installed in clay soil, either with displacement or semi-displacement method, the installed inclusions may experience heave (similar like driven pile), which is caused by ground deformation in the vicinity of installed inclusions. As these inclusions are not reinforced, mobilizing upward skin friction from excessive heave may develop into an integrity issue, specifically, when the mobilized upward force is larger than the inclusion tensile capacity. This study shows an observed heave on unreinforced inclusion columns. Retrospective soil heave prediction using shallow strain path method (SSPM), is presented. Proposed recommendations for avoiding such issue are discussed.

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Ground Improvement Case Histories and Advances in Practice

Cited by 5 publications

References 3 publications

Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Dynamic Replacement: The Influence of Pounder Diameter and Ground Conditions on Shape and Diameter of the Columns

Field tests of perspective constructions of conic foundations under coal field of Karaganda conditions

Heave Analysis of Unreinforced Inclusion Column in Low Sensitivity Soft Clay

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