Ground improvement in transportation projects: from old visions to innovative applications

Munfakh, George A.

doi:10.1680/grim.2003.7.2.47

Cited by 10 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, if the quality of weak soil can be improved using any low-cost waste materials, it will be an economical approach. Some of the problematic soil for pavement construction are collapsible soil, liquefiable soil, filling materials, loose deposits, swelling soil, and soft and marshy land [2]. One of the important modification techniques of fine-grained soils is mechanical stabilization or in other words, change in gradation.…”

Section: Introductionmentioning

confidence: 99%

Subgrade Black Cotton Soil Stabilization Using Ground Granulated Blast-Furnace Slag (GGBS) and Lime, an Inorganic Mineral

Darisi

Molugaram

Madiraju

2021

The 2nd International Electronic Conference on Mineral Science

View full text Add to dashboard Cite

The rapid growth of population and fast urbanization has resulted in the reduction of the good quality of available land. Black cotton (BC) soil is one of such problematic soils, though they are very fertile soils, they are not suitable for the foundation of roads and buildings. They are expansive clays with a high potential for shrinking or swelling as a result of changing moisture content. Due to the intensive shrink-swell process, surface cracks appear during dry seasons. A small amount of rainfall, such as 6mm can make these soils impassable for all traffic. About 23% of the area in India is covered by BC soil. To utilize expansive soils effectively, proper ground improvement techniques are to be adopted. One of the most widely used techniques is to stabilize the expansive soil with conventional admixtures like lime, GGBS, cement, and fly ash. In the present study, an attempt is made to modify the engineering properties of black cotton soil. This research work presents the improvement of engineering characteristics of expansive soils using Lime and GGBS as an additive. For experimental work, Lime of 2%, 4%, and 6% used and corresponding 5%, and 10% of GGBS is used. Tests like the California Bearing Ratio (CBR) test, Unconfined Compression Strength (UCS) test, proctor test, Atterberg’s limits performed. After stabilization, it was found that UCS and CBR of soil increased significantly.

show abstract

Section: Introductionmentioning

confidence: 99%

Subgrade Black Cotton Soil Stabilization Using Ground Granulated Blast-Furnace Slag (GGBS) and Lime, an Inorganic Mineral

Darisi

Molugaram

Madiraju

2021

The 2nd International Electronic Conference on Mineral Science

View full text Add to dashboard Cite

show abstract

“…Soft soils experience cyclic stresses expected to have high residual settlement resulting in reduction in strength and in some cases could lead to failure (Brown, 1996, Li andSelig, 1998). Studies on dynamic performance of stone columns are mostly limited to mitigation of liquefaction potential in silty soils (Munfakh, 1984, 2003, Priebe, 1995, Rollins et al, 2009 but very limited research has been carried out on the performance of stone columns subjected to repeated vertical loading. Behaviour of columns subjected to vertical cyclic load in terms of failure mechanism and settlement at low replacement ratio (under 10%) require further investigation.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Model Stone Column Subjected to Cyclic Loading

Ashour¹,

Ghataora²,

Jefferson³

2022

Transportation Geotechnics

View full text Add to dashboard Cite

“…The ground improvement works are then undertaken using rolling dynamic compaction with a ‘square’ impact roller whose operation is described below. The use of ground impacts produced by rammers, or swinging or falling weights to improve or densify ground for construction purposes, dates from early civilization (Munfakh ). With the advent of mechanization, soil compaction of relatively thin layers of natural or selected soils is usually achieved by heavy rollers that compress the soils, displacing air, reducing porosity and increasing soil density and modulus.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the effectiveness of rolling impact compaction at a brownfield site with high and low frequency seismic surface waves and geotechnical testing

Whiteley

Caffi

2013

Near Surface Geophysics

View full text Add to dashboard Cite

Using a case study from a brownfield site in Australia that contained substantial uncontrolled crushed rock fill, we demonstrate that innovative geophysics and ground improvement using rolling dynamic compaction can provide alternatives to costly excavation, removal and re-engineering of soils. This approach can also overcome some of the limitations of conventional geotechnical testing in such conditions. The process we have developed involves selection and levelling of trial areas within larger brownfield sites. These are initially screened with electromagnetic geophysics to target environmental sampling sites, buried objects and local areas of potentially unsuitable or contaminated soils for removal and replacement. High and low frequency surface wave testing is then completed along closely spaced lines within the trial areas using specially adapted Multi-channel Analysis of Surface Waves (MASW) methods and a modified land streamer. This provides S-wave velocity distributions within fill and deeper materials over two depth ranges, at high vertical resolution from approximately 0 to 2 m and at lower resolution from 2 to ~10 m. These results are compared with geotechnical engineering test information. Ground improvement works are then undertaken using rolling dynamic compaction with a 'square' impact roller.Within this brownfield trial area, geotechnical testing showed that post-compaction in-situ densities increased by about 6 to 10%, while S-wave velocities increased by up to 40%. This clearly demonstrates the sensitivity of S-wave velocities to soil and fill modulus. The S-wave velocity sections also showed the consistency of the landform created by impact rolling and that both high and low frequency MASW testing is needed for more accurate assessment of the densification of both shallow and deeper fill. Normalized S-wave velocity difference sections and Cone Penetrometer Testing (CPT) provided a clear indication of the depth of influence of the impact rolling.A relationship was developed between post-compaction S-wave velocity and Dry Density Ratio (DDR) that formed the basis of a viable geotechnical verification strategy for the ground improvement works on the larger brownfield site. Electromagnetic and advanced surface wave geophysics, combined with innovative ground improvement methods by rolling dynamic compaction, represent an advance over current practice for brownfield site development.

show abstract

Ground improvement in transportation projects: from old visions to innovative applications

Cited by 10 publications

References 0 publications

Subgrade Black Cotton Soil Stabilization Using Ground Granulated Blast-Furnace Slag (GGBS) and Lime, an Inorganic Mineral

Subgrade Black Cotton Soil Stabilization Using Ground Granulated Blast-Furnace Slag (GGBS) and Lime, an Inorganic Mineral

Behaviour of Model Stone Column Subjected to Cyclic Loading

Evaluating the effectiveness of rolling impact compaction at a brownfield site with high and low frequency seismic surface waves and geotechnical testing

Contact Info

Product

Resources

About