Moisture Migration from Portland Cement Grout into Clay and Influence on Side Resistance of Bored Piles and Drilled Shafts

IFCEE 2018 ◽  
2018 ◽  
Author(s):  
Alan J. Lutenegger
Keyword(s):  
Portland Cement ◽  
Drilled Shafts ◽  
Cement Grout ◽  
Moisture Migration ◽  
Side Resistance ◽  
Bored Piles

Reliability approach for the side resistance of piles by means of the total stress analysis (α Method)

2007 ◽  
Vol 44 (11) ◽  
pp. 1378-1390 ◽  
Author(s):  
C. Cherubini ◽  
G. Vessia
Keyword(s):  
Stress Analysis ◽  
Undrained Shear Strength ◽  
Clayey Soils ◽  
Total Stress ◽  
First Order ◽  
Side Resistance ◽  
Reliability Method ◽  
Real Size ◽  
Bored Piles ◽  
Adhesion Factor

The evaluation of the pile–soil adhesion plays a fundamental role in the estimation of the side resistance for total stress analysis. Over the years, researchers have presented proposals for adhesion factor formulations even though only a few of them have shown a certain agreement in numerical and (or) methodological terms. Hence, several real-size experimental analyses have improved the understanding of the pile–soil adhesion phenomenon and mechanism. Nevertheless, the undrained shear strength (cu) values depend on the experimental technique employed. Such results force engineers to make a difficult choice among various formulations. A reliability analysis is performed in this paper to take into consideration the variations in formulations and values of the side resistance of bored piles in clayey soils. This study involves piles having different lengths and diameters, which are supposed to be bored in Matera clays. Such soil is characterized by means of laboratory investigation campaign, and its mechanical and stochastic main features are reported here. Values of reliability index β are calculated by means of the first-order reliability method.

Injection d'ancrages à base de ciment Portland dans l'arctique

1987 ◽  
Vol 14 (5) ◽  
pp. 690-693 ◽  
Author(s):  
Brahim Benmokrane ◽  
Pierre-Claude Aïtcin ◽  
Gérard Ballivy
Keyword(s):  
Shear Strength ◽  
Portland Cement ◽  
Key Words ◽  
Cement Grout ◽  
The Arctic ◽  
Rock Surface ◽  
Rock Layer ◽  
The Mean ◽  
Group Contact

During summer, it is possible to inject Portland cement grout in the Arctic because there is a layer of unfrozen rock surface which is approximately 2 m deep. During the month of August, the temperature of the unfrozen rock layer reaches +5 °C at a depth of 1 m, which allows the Portland cement to harden in good conditions and to acquire its full strength.After 7 days, the mean shear strength to failure at the rod–group contact, determined when the anchorages were pulled out, was 10 MPa. After 1 year, this strength was close to 20 MPa. These results are similar to those recorded in Sherbrooke for the same grout formulas. Key words: anchorage, cement grout, rock, Arctic, tearing off. [Journal translation]

scholarly journals Evaluation of Unit Side Resistance of Drilled Shafts by Revised SPT N Value

2013 ◽  
Vol 29 (12) ◽  
pp. 5-10
Author(s):  
Min-Seung Yoon ◽  
Chea-Keon Lee ◽  
Myung-Hak Kim
Keyword(s):  
Drilled Shafts ◽  
N Value ◽  
Side Resistance ◽  
Spt N Value

Side Resistance of Large Diameter Bored Piles Socketed into Decomposed Rocks

2001 ◽  
Vol 127 (8) ◽  
pp. 642-657 ◽  
Author(s):  
Charles W. W. Ng ◽  
Terence L. Y. Yau ◽  
Jonathan H. M. Li ◽  
Wilson H. Tang
Keyword(s):  
Large Diameter ◽  
Side Resistance ◽  
Bored Piles

Test study on the characteristics of mudcakes and in situ soils around bored piles

2009 ◽  
Vol 46 (3) ◽  
pp. 241-255 ◽  
Author(s):  
Zhong-Miao Zhang ◽  
Jun Yu ◽  
Guang-Xing Zhang ◽  
Xin-Min Zhou
Keyword(s):  
Bearing Capacity ◽  
Void Ratio ◽  
Cement Grout ◽  
Test Results ◽  
Lower Shear ◽  
Bored Pile ◽  
Test Study ◽  
Disturbed Zone ◽  
Bored Piles

Constructing a bored pile produces a disturbed zone of soil adjacent to the pile, referred to as a “mudcake.” The physical properties of the mudcake are different from those of the surrounding soil. This paper reports research on bored piles in silt, clay, and sandy silt layers in Hangzhou, China. Laboratory tests were performed on samples of in situ soil, mudcake, and mudcake mixed with cement grout. The test results showed that mudcakes have a higher water content, higher void ratio, higher compressibility, lower friction, and lower shear strength than in situ soils. They also showed that mudcake properties could be improved by the addition of cement grout. Mudcakes form a weak, thin layer between a pile and a borehole wall, which can lead to a decrease in bearing capacity and an increase in settlement of the pile. Grouting improves the characteristics of mudcakes remarkably, thereby increasing the bearing capacity of piles, which is demonstrated by the case history in this paper.

scholarly journals A New Approach to Estimate Side Resistance of Rock Socketed Drilled Shafts

2007 ◽  
Vol 47 (2) ◽  
pp. 415-421 ◽  
Author(s):  
Myung Sagong ◽  
Kyuho Paik ◽  
Daehyeon Kim
Keyword(s):  
Drilled Shafts ◽  
New Approach ◽  
Side Resistance
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