Geomechanics of Soft Ground Improvement by Perforated Piles: Review and Case Study

Civil Infrastructure built on soft and compressible soil is likely to collapse due to undrained shear failure or unacceptable settlement of supporting foundations. Incorporation of adequate ground improvement technique with the aim of upgrading the strength and stiffness of the weak soil is essential in such cases. Amongst various established methods adopted worldwide for improving soft ground, using perforated piles is a relatively emerging technique. Such piles not only transmit the structural load into the subsoil beneath in a manner similar to the conventional piles, but also assist in radial consolidation of soft soil due to perforated side walls. This paper presents a brief overview on the investigations carried out on this new technique. Also, a typical case study has been presented. As observed, the axial pile capacity progressively increased while settlement reduction took place, with accelerated radial consolidation.

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Research to build technological procedure for soft ground improvement using sea sand-cement-fly ash column

Journal of Mining and Earth Sciences ◽

10.46326/jmes.htcs2020.01 ◽

2020 ◽

Vol 61 (HTCS6) ◽

pp. 1-9

Author(s):

Thinh Duc Ta ◽

Phuc Dinh Hoang ◽

Thang Anh Bui ◽

Trang Huong Thi Ngo ◽

Diu Thi Nguyen ◽

...

Keyword(s):

Fly Ash ◽

Load Capacity ◽

Ground Improvement ◽

Soft Soil ◽

Soil Reinforcement ◽

Soft Ground ◽

Design Calculation ◽

Sea Sand ◽

Composite Ground ◽

Soft Ground Improvement

Sea sand-cement-fly ash column technology for soft soil treatment is a new technology in the process of completing the theoretical basis, the experimental basis, and the construction of the ground treatment technological procedure. The paper presents the results of scientific research on design, calculation, construction, and acceptance of sea sand-cement-fly ash column. The scientific basis for the design of column is to consider the role of the column in composite ground, that is to use the column as soft ground improvement or soft soil reinforcement. The important parameters for the column design are: cement and fly ash content; column length; column diameter; number of columns; distance among columns; load capacity and settlement of composite ground. The sequence of steps of construction and acceptance of column includes: selection of construction equipment, preparation of construction sites, trial construction, official construction, evaluation of ground quality after treatment and preparation of document for acceptance.

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Experimental application of optimal depth of PVDs determination under vacuum loading condition

Science and Technology Development Journal ◽

10.32508/stdj.v19i1.511 ◽

2016 ◽

Vol 19 (1) ◽

pp. 116-121

Author(s):

Nhat Dai Vo ◽

Viet Hoang Quoc Lam ◽

Tuan Minh Pham

Keyword(s):

Loading Condition ◽

Ground Improvement ◽

Soft Soil ◽

Small Error ◽

Soft Ground ◽

Optimal Depth ◽

Geological Feature ◽

Experimental Application ◽

Technical Requirements ◽

Soft Ground Improvement

Viet Nam is one of the country that has a very soft and complicated geological feature. Therefore, how to economize cost but satisfy the standard and technical requirements in designing by selecting an appropriate method in building especially projects constructed on soft ground is always needed to consider and research continuouslly. In this paper, a method how to determine the optimal depth of PVDs under vacuum loading condition for soft ground improvement is presented and applied to specific case in 861 provincial street, Ward Cai Be, Tien Giang District. The soft soil includes two layers with total 12m thick and is allowed to drain on the top and bottom faces (double drainage). The result shows that the optimal depth of PVDs is about 10,5m with the small error of 0,7%

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Application of Artificial Neural Network to Soft Ground Improvement: A Case Study

Proceedings of the International Conference on Ground Improvement & Ground Control ◽

10.3850/978-981-07-3559-3_01-0119 ◽

2012 ◽

Author(s):

Laricar Dominic Trani

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Ground Improvement ◽

Soft Ground ◽

Artificial Neural ◽

Soft Ground Improvement

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APPLICATION THE POINT FOUNDATION (PF) METHOD FOR SOFT SOIL IMPROVEMENT: A CASE STUDY FROM VETNAM

Iraqi Geological Journal ◽

10.46717/igj.53.2d.1ms-2020-10-23 ◽

2020 ◽

Vol 53 (2D) ◽

pp. 1-18

Author(s):

Bui Truong Son

Keyword(s):

Bearing Capacity ◽

Ground Improvement ◽

Soft Soil ◽

Soil Improvement ◽

Static Compression ◽

Successful Case ◽

Soft Ground Improvement ◽

Final Settlement ◽

Shallow Footing

The point foundation method is the head enlarged cement deep mixing columns with high-quality control which can be used for soft ground improvement. The article aims to present the application of this method to treat soft soil for the foundation of Samse Vina factory, Ninh Binh province. The thickness of soft soil varies from 5.4 m to 7.4 m with high compressibility and low shear strength. Thus, point foundation was used to improve this layer. The prediction methods of soil bearing capacity and the settlement on the point foundation were calculated. After the treatment of soil, the unconfined compression strength of the point foundation column was determined and the static compression test for the point foundation column was also performed. The research results show that this method can significantly reduce the settlement of shallow footing and improved the bearing capacity of the soil. The final settlement of shallow footing was smaller than 2.54 cm and the bearing capacity of soil treatment can be satisfied with the requirement of construction building. This is a successful case of the application of point foundation to improve soft soil in Vietnam.

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