Emerging Geosynthetic Products - LK Kachhwal

Emerging geosynthetic products have changed the geotechnical engineering perspective concerning soft and compressible soil conditions.  The conventional approach of excavate, remove, and replace with quality engineered backfill can be very labourious, time consuming, and uneconomical.  An alternate approach involves the use of high-strength geosynthetic material for reinforcement and improvement of subgrade soils.  We utilized this technique to support a 40 m-diameter fuel storage tank on a geosynthetic reinforced earth foundation (GREF) that was constructed on soft and compressible soils.

In 2015 Nichols Environmental completed a geotechnical investigation, which revealed that the in situ soil conditions on site comprised compressible, soft, and high plastic black lacustrine clay mixed with organics.  It was determined this upper layer of clay soil was not suitable for the foundation of the tank, and a deep pile foundation was not desired by the client due to cost and other site development constraints.

2019 02 05 Blog post Tank 1

A 3.0 m-thick GREF pad was designed using eight layers of high-strength geotextile sandwiched between imported 6-80 granular (Alberta Transportation) fill material.  The settlement calculations were conducted manually and using a computer model.  The total maximum uniform settlement of 150 mm was predicted.  During hydrostatic load testing of the tank, conducted over a period of 12-days, the measured total uniform settlement ranged between 54 mm and 122 mm, so the uniform settlement was within the predicted values during the design of the GREF.

2019 02 05 Blog post Tank 2

The GREF performed satisfactorily and resulted in significant cost and time savings to the client, in comparison to a deep pile foundation strategy.  A case study paper on this project will be accepted for publication and be presented at the Geosynthetics Conference, Houston, 2019. 

Locations

Head Office – Edmonton
17331 – 107th Avenue NW
Edmonton, Alberta T5S 1E5

Phone: (780) 484-3377
Fax: (780) 484-5093

Calgary Office
427 Manitou Road SE
Calgary, Alberta T2G 4C2

Phone: (403) 452-1820
Fax: (403) 984-8803

Peace Region
#2, 4115 - 41st Avenue
Whitecourt, Alberta T7S 0A3

Office: (780) 484-3377
Toll Free: 1-877-888-6325

Saskatoon Office
Office: 1-877-888-6325

What's New

  • June 03, 2019
    At our monthly Health and Safety meeting today, we discussed 'Leadership for Safety Excellence'. Here at Nichols the safety of our employees and those around us is everyone’s responsibilit...
  • February 20, 2019
    For Immediate Release: February 19, 2019 Nichols Environmental (Canada) Ltd. is excited to announce our expansion into the Saskatchewan market with the opening of our Saskatoon office this co...

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