Summary of the Brazilian experience on ground improvement with jet grouting for soft ground tunneling

2013 ◽  
pp. 2340-2347
Author(s):  
G Guatteri ◽  
A Koshima ◽  
J Lopes ◽  
M Pieroni
Keyword(s):  
Ground Improvement ◽  
Soft Ground ◽  
Jet Grouting

scholarly journals Numerical Analysis on Performance of the Middle-Pressure Jet Grouting Method for Ground Improvement

Geosciences ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 313
Author(s):  
Shinya Inazumi ◽  
Sudip Shakya ◽  
Takahiro Komaki ◽  
Yasuharu Nakanishi
Keyword(s):  
Life Cycle ◽  
Comparative Analysis ◽  
Ground Improvement ◽  
Cement Slurry ◽  
Mechanical Agitation ◽  
High Quality ◽  
Jet Grouting ◽  
Computer Aided ◽  
Improvement Method ◽  
Cae System

This study focused on the middle-pressure jet grouting method, which has a complicated development mechanism for the columnar soil-improved body, with the aim of establishing a computer-aided engineering (CAE) system that can simulate the performance on a computer. Furthermore, in order to confirm the effect of middle-pressure jet grouting with mechanical agitation and mixing, a comparative analysis was performed with different jet pressures, the development situation was visualized, and the performance of this method was evaluated. The results of MPS-CAE as one of the CAE systems showed that the cement slurry jet ratio in the planned improvement range, including the periphery of the mixing blade, by the middle-pressure jet grouting together with the mechanical agitation and mixing was increased and a high quality columnar soil-improved body was obtained. It is expected that the introduction of CAE will contribute to the visualization of the ground, and that CAE will be an effective tool for the visual management of construction for ground improvement and the maintenance of improved grounds during the life cycle of the ground-improvement method.

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

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.

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

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%

scholarly journals Evaluation of strength characteristics for palm kernel oil - based Polyurethane (PKO-P) as a ground improvement method

2017 ◽  
Vol 12 (4) ◽  
Author(s):  
Diana Che Lat ◽  
Ismacahyadi Bagus Mohamed Jais ◽  
Kamaruzzaman Mohammed ◽  
Bahardin Baharom ◽  
Nastasa Samat ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Pile Foundation ◽  
Maximum Stress ◽  
Ground Improvement ◽  
Palm Kernel ◽  
Maximum Strength ◽  
Strength Characteristics ◽  
Soft Ground ◽  
Palm Kernel Oil ◽  
Kernel Oil

 Development on soft ground area cannot be avoided at certain area especially nearby coastal or marine area. At urban areas, most of the land has been fully developed and very limited space available, therefore area nearby marine region has to be explored to cater increasing in population in certain country. It is very crucial to stabilize the soft ground before any construction carried out to ensure the structure would be founded on the stable foundation system. Foundation system commonly established for deep soft ground is a pile foundation. There are certain cases whereby pile foundation system failed after completion of structure and the building has been accommodated or been utilized. It causes large settlement which contributes to the failure of structure such as longitudinal crack, sinkholes, beam fractured and so forth. Rectification works have to be done to restore foundation strength thus to prevent further settlement which can cause collapse or major failure of structure. Rectification works that commonly being done nowadays is underpinning pile whereby new pile being installed in between the existing pile to stabilize the foundation and prevent further settlement. This method rather wearisome to be carried out since it involves major excavation and disturbs the existing structure and the surrounding. Therefore it is proposed to carry out Palm Kernel Oil Based Polyurethane (PKO-P) Pile injection to overcome this problem. PKO-P pile injection is a lightweight material to prevent further settlement and the rectification works can be done very fast. No excavation is required and only a small diameter of hole is drilled on the existing slab foundation before injection of PKO-P Pile. PKO-P is a polyurethane processed from palm kernel oil which is renown of the sustainability and green materials. In this research, Unconfined Compression Test been have conducted on few samples of PKO-P materials with different ratio of polyol and isocynate to determine the compressive strength characteristics for PKO-P materials as such to evaluate the performance of the PKO-P for ground improvement. From the test that has been done, the compressive strength achieves its maximum strength at isocynate to polyol ratio of 1:0.75 with maximum compressive strength of 2.3MPa. PKO-P shows rigid characteristics at this maximum strength which produce strong material, able to resist deformation but brittles beyond the maximum stress. With further increasing amount of polyol, PKO-P shows flexible characteristics whereby it undergoes deformation but they tend not to break beyond the maximum stress. Higher elastic modulus recorded for rigid type PKO-P compare to flexible type PKO-P.

Jet-Grouting in Cohesive Soils for Ground Improvement in Hawaii

GeoRisk 2011 ◽  
2011 ◽  
Author(s):  
John Y. L. Chen ◽  
Robin M. Lim ◽  
Kyle Furuhashi
Keyword(s):  
Ground Improvement ◽  
Cohesive Soils ◽  
Jet Grouting
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