Civil Engineering Association - Journal of Geotechnical & Geoenvironmental Engineering

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Journal of Geotechnical & Geoenvironmental Engineering

Ultimate Lateral Resistance of Pile Groups in Sand

Abstract : Presents information on a study which investigated the resistance of model pile groups to lateral loads in Chennai, India. Methodology; Results and discussion.

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Evaluation of Pile Diameter Effect on Initial Modulus of Subgrade Reaction

This paper presents the results of a study on the effect of pile diameter on the initial modulus of subgrade reaction. A series of ambient and impact vibration tests were performed on four different diameters of cast-in-drilled-hole piles to determine the natural frequencies and damping of the soil-pile systems. The measured natural frequencies were then compared with those estimated from a numerical model. The soil springs in the numerical model were established by implementing two different concepts on initial modulus of subgrade reaction. One is based on Terzaghi’s concept in which the modulus of subgrade reaction is independent of pile diameter. The other was based on recent research suggesting that the initial modulus of subgrade reaction may be linearly proportional to pile diameter. It was found that the measured natural frequencies were in good agreement with the computed ones when the diameter-independent modulus of subgrade reaction was employed. In addition, the test results show that the damping ratio of the system varied with pile diameter from 3% for 0.4-m pile to 25% for 1.2-m pile.

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Ultimate Lateral Resistance to Piles in Cohesionless Soils

Several methods are available for predicting the ultimate lateral resistance to piles in cohesionless soils. However, these methods often produce significantly different ultimate resistance values. This makes it difficult for practicing engineers to effectively select the appropriate method when designing laterally loaded piles in cohesionless soils. By analyzing the lateral soil resistance distribution along the width of the pile and based on the test results of model rigid piles in cohesionless soils collected from the published literature, a simple method is proposed for calculating the ultimate lateral resistance (including frontal soil resistance and side shear resistance) to piles in cohesionless soils. The calculated ultimate lateral resistance from the proposed method agrees well with that obtained from centrifugal tests of flexible model piles. Predicting the lateral load capacity of laboratory and field rigid test piles in cohesionless soils using the proposed method also yields satisfactory results.

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Reliability-Based Optimization of Design Code for Tension Piles

Abstract:
Proposes a reliability-based calibration of a design code for offshore tension pile foundations in clay. Background on offshore tension plies; Loading and response; Capacity; Code calibration; Discussion and conclusions.

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Factors Affecting Long-Term Efficiency of Compensation Grouting in Clays

Compensation grouting has been attracting attention in recent years to control ground settlement caused by underground construction. A successful and effective application of compensation grouting depends not only on the use of a good monitoring system in the field but also on a fundamental understanding of grout behavior in soils. For compensation grouting in clay, there is a need to consider the long-term effectiveness of compensation grouting. Grout injection tests were conducted in the laboratory to examine soil fracturing patterns and consolidation effects in relation to compensation grouting. Both compaction and hydrofracturing modes of grouting were tested on kaolin clay specimens with different overconsolidation ratios. Finite-element analysis was also conducted to simulate the balloon expansion tests (ideal compaction grouting tests) and the results were compared with the data from the laboratory tests. Based on the research findings, new design criteria are proposed to improve the long-term efficiency of compensation grouting for clays.

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Time-Dependent Mechanical Response of HDPE Geomembranes

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Bearing Capacity of Piled Rafts on Soft Clay Soils

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Performance of a Cantilever Retaining Wall

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Contribution to Piled Raft Foundation Design

Simplified Nonlinear Analysis for Settlement Prediction of Pile Groups

Both papers

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Physical Modeling of Raft on Settlement Reducing Piles

The paper presents the results of extensive centrifuge tests modeling rigid circular piled rafts laying on a bed of loose very fine silica sand. The tests were aimed at investigating the behavior of rafts on settlement reducing piles. The testing program included: an unpiled raft, rafts on 1, 3, 7 and 13 piles. In each test, some model piles were instrumented with load cells to determine the distribution of load along the shaft. Beneath the rafts, two types of model piles, close-ended and free headed were installed: quasi displacement (QD) and quasi-non displacement (QND) piles. The obtained results permitted figuring out the role of piles in terms of their effectiveness as settlement reducers and to quantify the load sharing mechanism between piles and the raft-soil contact. The tests were aimed at investigating the load transfer mechanisms adopted in the design approach, and in particular at validating a numerical code which can be used in engineering practice. The paper describes the details of experiments undertaken, the adopted procedures and some of the results; where not specified, all the experimental data given in this paper referred to model scale. The adopted numerical code is briefly described and its validation, via test results on quasi-non displacement piles, is also reported.

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Intramethod Variability in ReMi Dispersion Measurements and Vs Estimates at Shallow Bedrock Sites

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Centrifuge testing of large laterally loaded pile groups in sands

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