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Dam Design
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TBT Engineering and its staff are well qualified with extensive experience in geotechnical and foundation engineering for dam design.

Past project experience includes new dam design, earth dam rehabilitation works, stability seepage loss assessments and forensic analyses. Design experience includes seepage modeling of groundwater control and pressure relief systems including pressure relief wells, downstream blanket drains and innovative upstream blanket drains to improve the passage of water while mitigating piping issues.

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Dam Design Service Projects

A partial list of relevant Project experience for TBT Engineering and/or its staff is as follows:

Design of Dam Monitoring and Instrumentation Plan

Agrium Inc.
Kapuskasing, ON
Agrium Kapuskasing Phosphate Operations

Design of a monitoring and instrumentation plan for two dams at Agrium’s tailings management area. Preparation of the plan involved seepage modeling, stress distribution analyses and stability modeling to determine locations of and alarm levels for various instruments. Instrumentation included piezometers, settlement gauges, and slope inclinometers. The instrumentation plan provided detailed procedures for monitoring and reporting both during construction and operation of the dams.

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Weir Replacement Berm

Musselwhite Mine, ON
Goldcorp Canada Ltd.

Design and construction inspection of a berm and associated partial flume to replace an existing weir to measure the discharge volumes from an existing retention pond.  Design included stability analyses and seepage modelling.

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Dam Upgrades, West Arm Dam No. 1

Steep Rock Lake, ON
Ministry of Natural Resources

Design of shoreline and crest rehabilitation measures for an existing dam. Design included: wave assessment, rip rap design, filter design, stability analyses, and seepage modelling.

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Design of Dams 3A and 3B North

Lac des Iles Mine, ON
North American Palladium

Geotechnical dam design of new tailings dams to be constructed over an existing tailings pond. Detailed design work included interpretation of electronic cone penetration testing, seepage analyses, piping assessment, settlement analysis and stability analyses. The dams were designed as lined rockfill dams with downstream blanket drains to improve resistance to piping. Dam 3A was also designed with a low permeable upstream liner to facilitate a temporary settling pond.

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Design of Dam 6

Lac des Iles Mine, ON
North American Palladium

Geotechnical design of a new perimeter tailings dam to facilitate an increase in tailings storage capacity. The dam was designed as a rockfill dam with an upstream geosynthetic clay liner. The dam was constructed over an abandoned spillway cut through bedrock.

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Design of West Cell Dams, Agrium Inc.

Kapuskasing, ON
Agrium Kapuskasing Phosphate Operations

Design of two tailings pond dams. The West Cell Dam was designed as a lined rockfill dam founded on soft sensitive clay foundation soils to replace an existing dam and increase the total height of the dam to 13 m. Splitter Dyke No. 1 was designed as a flow through rockfill dam with a downstream toe drain to prevent piping of the foundation soils. This dam was founded over a layer of tailings slims. Key design analyses included assessment of strain softening within the foundation soils and seismic stability analyses.

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Design of 2004 Raise of Dam 5

Lac Des Iles Mine, ON
North American Palladium

Dam 5 is a splitter dam which separates two tailings ponds. The functions of the dam are to provide road access, support for mill pipelines and retain tailings while allowing water to pass through. The design of the dam included an innovative upstream blanket drain to facilitate passing of water and to mitigate the potential for piping. Staged construction was utilized to ensure stability during construction.

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Raise of Emergency Spillway

Lac des Iles Mine, ON
North American Palladium

serif; font-size: 11px; color: #333333; text-align: left;">In order to optimize the operating efficiency of the Tailings Management Facility, an assessment of raising the Emergency Spillway of the Water Reservoir was carried out. The assessment concluded that the spillway could be raised significantly. The assessment included review of dam stability, wave effects and modelling of seepage losses.

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Various Tailings Dams
Pickle Crow Mine

Pickle Lake, ON
Cantera Mining Ltd.

Detailed design of various dams for tailings and water retention. Work included: geotechnical investigations, detailed design, construction drawings, technical specifications and quality control and inspection services.

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Tailings Impoundment Dams
Kam Kotia Mine Rehabilitation Project

Timmins, ON
Ministry of Northern Development and Mines

Design of new impoundment dams and assessment of the stability and seepage characteristics of an existing dam for the Kam Kotia Mine Rehabilitation project. Design included: liquefaction assessment, slope stability analyses considering seismic loading and design of measures to control seepage losses.

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Containment Berm
Northern Wood

Thunder Bay Harbour, ON
Environment Canada, Ministry of Environment, Abitibi-Consolidated, CN Rail, Northern Wood Preservers

Geotechnical investigation for design of a rockfill containment berm to contain contaminated sediments and clean capping materials, constructed of shale fill in 8 m of water with heavy rip rap protection, incorporating innovative fish habitat features. The geotechnical investigation included advanced in-situ testing utilizing an electronic cone penetrometer, convention geotechnical drilling and sampling together with a comprehensive laboratory testing program. Geotechnical analyses and modeling were carried out to assess the stability of the proposed berm, which included analysis of lakebed displacements, staged construction and long-term consolidation settlements.  Wave and ice analysis for rip rap/armour stone design was completed to optimize gradation requirements and placement location. In addition, a comprehensive monitoring and instrumentation program was carried out to ensure stability during staged construction and refine predictions of settlement performance.

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"From Testing Through to Consultation,
We Are Your 'Down to Earth' Consultants"


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