Flat Dilatometer Test (DMT) in Brandon Manitoba

The Flat Dilatometer Test (DMT) follows ASTM D6635 (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4) to measure in-situ soil stiffness and lateral stress. In Brandon Manitoba, where glaciolacustrine clays and silts dominate the upper 10 to 15 meters, the DMT provides critical data for foundation design. Unlike standard penetration tests, the DMT captures stress history and modulus values with minimal disturbance, making it ideal for soft to firm cohesive soils found across the Assiniboine River valley. We integrate DMT results with ensayo SPT when granular layers require resistance profiles, and with consolidación lab tests to calibrate settlement predictions for stiff clay crusts.

Illustrative image of Dilatometro in Brandon Manitoba

The DMT provides direct measurement of in-situ horizontal stress and modulus, essential for predicting settlement and lateral response in Brandon Manitoba's glaciolacustrine clays.

Our service areas

Ground improvement

Unsaturated soil analysis ›Stone column design ›Dynamic compaction design ›Deep Soil Mixing (DSM) design ›Geotechnical drainage design ›

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Slopes & Walls

Soil erosion analysis ›Slope stability analysis ›Slope failure analysis ›Debris flow analysis ›Factor of safety (FS) calculation ›

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Foundations

Differential settlement analysis ›Settlement analysis ›Bearing capacity analysis ›Foundations on fill (analysis) ›Shallow foundation design ›

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Methodology and scope

Brandon Manitoba experiences cold winters and summer thaws that generate seasonal moisture changes in the upper soil profile. The DMT excels here because it measures the horizontal stress index (Kd) and dilatometer modulus (Ed) at 20 cm depth intervals, detecting subtle stiffness variations that seasonal cycles produce. The test deploys a stainless steel blade with a flexible membrane, inflated to lift the soil. We record three pressures per depth: liftoff (p0), 1.1 mm expansion (p1), and deflation (p2). These yield material index (Id), horizontal stress index (Kd), and dilatometer modulus (Ed). The equipment is lightweight and does not require reaction mass, a practical advantage in Brandon Manitoba’s residential lots and narrow commercial sites. We pair DMT data with estudio mecánica suelos for a complete geotechnical profile.

Technical reference — Brandon Manitoba

Local considerations

Brandon Manitoba grew rapidly during the railway expansion of the 1880s, and many early buildings were placed directly on shallow clay without soil testing. The risk today is two-fold: existing structures on untreated clay may suffer differential settlement, and new developments on the Assiniboine floodplain encounter soft lacustrine deposits with low bearing capacity. Skipping a DMT leaves designers blind to lateral earth pressures and overconsolidation ratios. We have seen cases where a single DMT sounding identified a stiff desiccated crust over soft clay, allowing engineers to size footings correctly and avoid costly over-excavation.

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Explanatory video

Applicable standards

ASTM D6635 (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4) (also CFEM Ch 4), NBCC 2020 (Division B, Part 4), CSA A23.3-19 (Concrete Design)

Technical parameters

Parameter	Typical value
Material Index (Id)	0.1 – 10 (clay to sand)
Horizontal Stress Index (Kd)	1.0 – 8.0 (OCR indicator)
Dilatometer Modulus (Ed)	0.5 – 50 MPa
Constrained Modulus (M)	1 – 100 MPa (from Ed and Kd)
Undrained Shear Strength (Su)	20 – 200 kPa (correlated)
Coefficient of Consolidation (ch)	1 – 50 m²/year (estimated)

Frequently asked questions

What does the DMT measure that other in-situ tests do not?

The DMT directly measures horizontal stress and soil stiffness at each depth, giving the horizontal stress index (Kd) and dilatometer modulus (Ed). These parameters are used to estimate overconsolidation ratio (OCR), coefficient of earth pressure at rest (K0), and constrained modulus (M). SPT or CPT do not capture horizontal stress directly, which is critical for laterally loaded piles and retaining walls in Brandon Manitoba's clay deposits.

How long does a DMT sounding take in Brandon Manitoba clay?

A single DMT sounding to 15 m depth typically takes 45 to 75 minutes, depending on clay stiffness and the presence of silt lenses. The lightweight blade and hydraulic push system allow rapid deployment. We can complete 3 to 5 soundings per day on a typical Brandon Manitoba subdivision site.

What is the typical cost range for a DMT in Brandon Manitoba?

The typical cost ranges from CA$1.270 to CA$1.460 for a single sounding to 15 m, including field data and a summary report. Volume discounts apply for multiple soundings on the same site. Contact us for a specific quote based on your project's depth and number of test points.

Location and service area

We serve projects across Brandon Manitoba.

Location and service area