Soil improvement experiences in Belgium: part II. Vibrocompaction and stone columns

Impe, William F. Van; Cock, F. De; Cruyssen, J. P. Van Der; Maertens, Jan

doi:10.1680/gi.1997.010303

Cited by 5 publications

(2 citation statements)

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“…One of the most common techniques for improving soft soils for the foundation of embankments or structures is stone columns, also known as granular piles or aggregate piers. Ground improvement by a stone column was believed to be a cost-effective method, as stated in [3][4][5]. Stone column involves improving weak soils by installing vertical boreholes in the ground, filled upwards with aggregates, and compacted by a vibrator.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Behavior of Stone Columns With Different Area Ratios in Soft Clays

Baqir

2024

GEOMATE

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The single floating stone column behavior in very soft soils with a low undrained shear strength of Cu ≤ 20 kN/m2 was studied in the finite-element method to investigate the influence of stone column's area ratio on the normalized pressure-settlement curves of circular footings of different diameters. The studied cases consist of stone columns of 1.0 m in diameter Ds and lengths Ls of (4 m, 6 m, and 7.5 m). The diameter of footings Df is (1.0 m, 1.2 m, 1.4 m, 1.6 m, 2.0 m, 2.5 m, and 3.5 m) which covers the area ratios with a range of 100 to 8.16 %. A total of 28 runs were carried out using the Ansys program to simulate the case for improved and unimproved soil. In the axisymmetric numerical model, the connection between the stone column and the adjacent contact clay soil was modeled as bonded type. The results of the analysis showed that there is a clear relationship between the bearing ratio (q/cu improved) / (q/cu unimproved) and the normalized settlement (S/Df) of the composite structure and the area ratio Ar% of the stone columns. The deformation ratio (Streated/Suntreated) and the footing diameter are related using a straightforward equation. In comparison to footings with a low area ratio, the footing displays a lower value of settling when subjected to the same pressure. By decreasing the diameter of the footing, the normalized settlement decreases for the same normalized q/cu values. The bearing ratio depends on the stone column length ratio Ls/Ds and settlement ratio. It is from 2.2 at a 100% area ratio and 1.23 at a 16% area ratio.

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Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Behavior of Stone Columns With Different Area Ratios in Soft Clays

Baqir

2024

GEOMATE

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“…In recent decades, although several books ( [14,20], etc.) were published on ground improvement along with many conferences held on ground improvement and related topics, there is no book detailing the design and modeling of reinforced soils by columns.…”

Section: Introductionmentioning

confidence: 99%

Rational design of foundations on soil reinforced by columns

Bouassida

2016

Innov. Infrastruct. Solut.

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This paper presents a review of the book titled ''Design of column-reinforced foundations'' that I recently published. The design of foundations on reinforced soil by columns is tackled within a general framework, where several aspects are taken into consideration: modeling of reinforced soil, bearing capacity, settlement, acceleration of consolidation, and improvement of soil characteristics with selected case histories. Unlike existing books on unique improvement techniques (deep soil mixing, stone columns, sand compaction piles) that focus on installation and equipment issues, this one-of-a-kind guide details design purpose. This book rationally handles the design of column-reinforced foundations (CRF) from modeling up to the study of behavior predicted by the numerical analysis and assessed by the field test results. Quasi-exact solutions of the ultimate bearing capacity of soil reinforced by a trench are suggested. The analytical solutions for predicting the settlement of CRF assuming the linear elastic behavior of constituents of soil reinforced by a group of columns are proposed. A novel methodology for the design of CRF is presented and illustrated by different study cases. The improvement of properties of the initial soil due to the installation of stone columns has been evidenced using numerical and experimental investigations. The behavior of foundations resting on soil reinforced by columns has been predicted by numerical 2D and 3D codes. Related results have been assessed after in situ data.

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Centrifuge modeling of ground improvement under embankments

Weber¹

2006

Pollack Periodica

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Soil improvement experiences in Belgium: part II. Vibrocompaction and stone columns

Cited by 5 publications

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A Numerical Study on the Behavior of Stone Columns With Different Area Ratios in Soft Clays

A Numerical Study on the Behavior of Stone Columns With Different Area Ratios in Soft Clays

Rational design of foundations on soil reinforced by columns

Centrifuge modeling of ground improvement under embankments

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