373 Resonance Compaction.pdf - 1.1 MB
A case history of compaction of a sand fill using resonance compaction equipment, reporting measurements and improvement of horizontal stress, modulus number, and preconsolidation stress.
370 Red Book - Basics of Foundation Design.pdf - 7MB
A foundation design text book addressing settlement analysis, piled foundations, footings, retaining walls, and vertical drain projects, supplementing conventional more comprehensive geotechnical textbooks. Revised January 2017.
352 Instrumented Bidirectional Test.pdf - 130 kb
Results of a bidirectional-cell test on a strain-gage instrumented 1.2 m diameter, 40 m long, bored pile in clay: Distributions of load and beta-coefficients, and unit shaft shear resistance versus movement relative to the soil.
312 Bidirectional-cell Tests for Icon Condominiums.pdf - 400 Kb
A case history of tests on bored piles in Singapore with aspects of the need for discarding the surviving gage of a pair of strain gages where one gage is unusable, views on tension in cooling concrete where pile contraction was prevented, obtaining equivalent head-down curves from effective stress analysis and use of t-z and q-z curves calibrated from the test results.
279 San Jacinto Monument Discussion - 220 Kb
Analysis of 70 years of settlement of the San Jacinto Monument put into context of general subsidence due to pumping for water and oil.
278 Ground vibrations induced by impact pile driving.pdf - 1070 Kb
Discussion on the effect of vibrations from pile diriving with guidelines for establishing limiting vibration levels. A theoretical concept is presented for calculation of attenuation of spherical and surface waves and of cylindrical waves generated at the pile toe and the pile shaft, respectively.
277 Bored Piles Tests Analysis.pdf - 264 Kb
Discussion on the evaluation of test data in a paper reporting full-scale bi-directional tests on bored piles installed for the Bangkok International Airport, Thailand.
274 Clarification of Confusion.pdf - 72 Kb
A critical comment on the EuroCode treatment of design for drag load. The code’s erroneous, very expensive, and yet unsafe approach is exposed by reference to the example presented in the code commentary.
273 & 275 Discussion on two papers.pdf - 1.3 MB
Discussion on two papers reporting a test on jacked H-piles bringing up aspects of proper evaluation of unit shaft resistance from strain gage determined load distribution and omitted values of residual loads.
270 Effective Stress Analysis.pdf - 0.3 MB
A series of histories on evaluation of pile capcity from effective stress analysis and a discussion on aging of pile capacity.
266 Deep vibratory compaction of granular soils.pdf -1.6 MB
Aspect of planning, design, and execution of deep vibratory compaction of natural and man-made fills are presented. Features of purpose-built types of compaction probes are described and the most important factors governing the compaction process are presented, such as vibration frequency - an important parameter as it influences probe penetration - and can enhance compaction by means of resonance effects during the compaction phase.
265 Drag load and downdrag -- Old and New.pdf – 1.2 MB
A compilation of the findings presented in several full-scale studies of drag load and downdrag since the mid 1960s, including some results not before published and reanalysis of the data.
263 Boundary Discussion.pdf – 235 Kb
Discussing the effect of boundary conditions (distance to container side) on results of centrifuge tests in a 550 mm diameter container.
259 Sandpoint - DFI.pdf – 690 Kb
A presentation of a highway project involving piled foundations over a 200 m thick deposit of soft clay with comments on the subsequent bridge and embankment design.
258 Fellenius Unified Design-Goble volume.pdf English versionversion Español A synthesis of the design for piles—piled foundations and pile drafts— with regard to capacity, drag load, settlement, and downdrag. Results of several full-scale field tests are included.
257 Orlando Prediction.pdf - 781 Kb A presentation and discussion of the predicted and the actual pile response to driving and static loading test for the GeoInstitute Orlando Prediction event February 2002.
255 Sandpoint CGJ.pdf - 1159 Kb Detail results of a static loading test on a 45 m long instrumented pipe pile driven into a thick deposit of soft clay. Measured distributions of residual load and soil resistance are compared to distribution determined from CPTU sounding.
248 Pile Group Settlement.pdf - 186 Kb
A back calculation of a case history reporting twelve years of settlement observations of a piled foundation, demonstrating how the settlement can be calculated applying conventional compressibility parameters and stress distribution.
242 & 246 Residual Load Analysis.pdf - 310 Kb
A two-part article published in Geotechnical News Magazine. The first part presents aspects of evaluation of strain-gages in instrumented piles with notes on Shift-of-No-Load-Reading and influence of Residual Loads. The second part describes in detail and with examples how analyze the test data and determine the magnitude and distribution of residual load and true resistance.
238 True Distribution of Load in Piles - 276 Kb
Paper to the ASCE GeoInstitute Conference February 2002. Tests on piles-driven or bored-sometimes include instrumentation for determining the load distribution. Most of the time, the measurements are analyzed from the assumption that the "zero readings", which are the readings taken at "zero" time, i.e. at the outset of the test, also have registered "zero" load. This assumption is more than a little off. It neglects the existence of locked-in loads-residual load-in the pile and is one of the sources of the myth of the so-called "critical depth" and neglecting residual load negates the primary objective of instrumenting a test pile. Examples are given on measured distributions of residual load and evaluated corrected (true) resistance.
234 Downdrag Discussion - 131 Kb
Asian Journal Discussion on the analysis of dragload and downdrag on piles and comparison of two approaches to the calculation of downdrag (settlement).
233 Strain to Load - 212 Kb
An article from Geotechnical News Magazine on how to determine load in an instrumented pile from strain values when the elastic modulus of the pile material is not a constant but a function of the imposed load.
232 Discussion on O'Neill - 913 Kb
ASCE Journal Discussion on the relevance of assuming different shaft resistance in pull as in push (resistance in tension versus in compression) with reference to analysis of case histories.
231 Vibratory Compaction - 412 Kb
Canadian Geotechnical Journal paper on a case history about a 10 m thick sand fill compacted using vibratory compaction. Soil conditions were determined using cone penetration tests before and at two and seven days after compaction. The results show significant increase of cone stress, which demonstrates decrease in compressibility (increase of modulus number). The results of settlement calculations based on the Janbu method demonstrates the importance of taking the preconsolidation effect into account in the analyses.
230 & 240 Analysis of Pile Capacity-DFI - 339 Kb
Two articles published in DFI Fulcrum on determining bearing capacity in a static loading test and how to use the capacity value in the design of piles.
229 Compressibility&ModulusNumber.xls - 102 Kb
Determining compressibility parameters (C-c, CR, and Janbu Modulus Number, m) from oedometer tests. An EXCEL spreadsheet template that is particularly useful to Users of the UniPile and UniSettle programs.
221 Guide for writing a thesis.pdf - 290 Kb
A guide to formatting reports and theses at the University of Ottawa with advice of expressions, units, spelling, references, and style. Several examples are included.
215 Using the Pile Driving Analyzer.pdf – 107 Kb>
Comments on the use of the Pile Driving Analyzer presented to the Pile Driving Contractor Association, PDCA, Annual Meeting, San Diego, February 1999
213 Go SI - 82 Kb
Lecture notes advocating the use of the SI-system.
212 The terzaghi unit - Discussion.pdf - 98 Kb
A tongue-in-cheek discussion on a proposal for adopting the unit "terzaghi" to be the unit for the Coefficient of Consolidation, cv, now expressed in m2/s
211 Dragload-Downdrag-Settlement - 881 Kb
The basics of the Fellenius Unified Pile Design of Capacity, Negative Skin Friction (Dragload and Downdrag), and Settlement. The approach is applied to a case study involving 100 ft to 190 ft long piles and is also a demonstration of the use of UniPile in an engineering project. Paper presented to a New York ASCE seminar in April 1998. The paper quotes several important case histories from the literature.
204 Tapered Piles in Sand - 552 Kb
Soil set-up, variable concrete modulus, and residual load for tapered instrumented piles in sand. An ASCE conference paper presenting a case history of testing and analysis of strain-gage instrumented Monotube steel pipe piles with method for the evaluation of non-constant concrete modulus and the effect of residual load.
203 O-Cell Barrette in Manila.pdf – 1,235 Kb
Analysis of data from Osterberg Cell testing of a 28 m deep barrette in Manila, Philippines, with application of the results to the foundation design of a 28-storey residential building.
202 Soil Profile from CPT - 631 Kb
Soil profile interpreted from CPTu data. A paper presenting soil profiling methods using the Cone Penetrometer, CPT and CPTu.
201 Pile Capacity from CPT - 1,300 Kb
The cone penetrometer test, CPT and CPTu, and its use for determining pile capacity. Several methods employed in current engineering practice are discussed, compared, and applied to a series of case histories. Canadian Geotechnical Journal article.
171 Critical Depth - 434 Kb
A paper entitled "Critical depth. How it came into being and why it does not exist." Explanation of the critical depth concept and why it is a fallacy. ICE Geotechnical Journal article.
162 Footings in sand.pdf – 490 Kb
Critique on the current practice of calculating settlement for footings, in particular when the calculation is based on relative density and extrapolation from model tests. The presentation brings forward scaling rules and emphasizes the importance of the critical state approach.
160 FastFoundation Disc.pdf – 7 Kb
A discussion on a case history for a large project with critical views on the of design of piled foundations.
155 Molikpaq.pdf – 1,015 Kb
Rules of physical modeling and their application to a full-scale case history.
153 Physical Modeling.pdf - 786 Kb
Explanation of how steady-state soil mechanics can explain the difference between observations of foundation behavior in full-scale as opposed to laboratory model scale with reference to why relative density is not a useful soil parameter. Canadian Geotechnical Journal article.
147 Comparison of static and dynamic results.pdf - 0.9 MB
A case history describing the testing programme for Alsea Bay Bridge, Oregon involving drivability and capacity studies using static and dynamic methods on a 500-mm diameter 40 m long spliced prestressed concrete pile driven to bedrock.
139 Piles in Sand Iraq-I.pdf – 850 Kb
Analysis of tests on piles in sand - Analysis of load-transfer and residual load from instrumentation data
135 Influence of Residual Load.pdf– 131 Kb Discussion on the load distribution results of the Evanston Prediction with regard to the presence of residual load in the instrumented piles. Predicted pile response vs. actual response.
134 Choosing Failure Load.pdf– 136 Kb Discussion on what failure load to use for reference to the results of the actual static loading tests and the predicted load-movement curves for the Evanston Prediction
120 Dynamic and Static Capacity plus set-up.pdf - 1.7 MB
Steel piles driven through estuarine deposited soils and into a variable glacial deposit to depths of 33 through 48 metre and subjected to dynamic monitoring during initial driving and restriking. Results from CAPWAP analysis and static loading tests are compared.
119 Evanston Prediction 1989.pdf – 148 Kb As submitted prediction of capacity of a 18-inch diameter 50 ft long pipe pile driven in sand and clay — "The Northwestern University, Evanston, prediction event".
034 The Svarta Slide.pdf - 730 Kb
A case history of a landslide triggered by pile driving and remediation work using wick drains to release pore pressures. The Discussion of the paper deals with presentation of the pore pressure measurements and how to plot in order to show the benefits of the wick drains.
030 Bäckebol.pdf - 875 Kb
Test arrangement and long-term measurements of dragload on two precast concrete pile in clay.
029 Buckling of Piles.pdf - 424 Kb
A case history of excavation and documentation of piles that have been displaced and broken due to soil movements.