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CPT University

Intro to Seismic CPT

- Posted by VertekCPT

TruckfromseismicgraphWhat is Seismic Cone Penetration Testing?

Seismic CPT or SCPT is a method of calculating the small strain shear modulus of the soil by measuring shear wave velocity through the soil. The small strain modulus is an important quantity for determining the dynamic response of soil during earthquakes, explosive detonations, vibrations from machinery, and during wave loading for offshore structures. The wave speeds and moduli derived from seismic CPT measurements aid in the determination of soil liquefaction potential and improve the interpretation of surface seismic surveys by providing wave speed profiles as a function of depth. Seismic waves from SCPT tests have been detected at depths of up to 300 feet.

How does it work?

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Topics: Introductory, Soil Testing

CPT 102: Common Corrections in CPT Data Analysis

- Posted by VertekCPT

Vertek CPT DataPack softwareIn a previous blog, we discussed the pore pressure sensor that is common to most modern CPT cones and briefly introduced why this reading is helpful in soil profiling. Today we’ll take a closer look at how pore pressure data is used to correct and analyze CPT data.

Pore pressure data is used to correct or “normalize” sleeve friction and cone resistance readings in the presence of in-situ moisture and overburden stress. This is especially important in soft, fine-grained soils where in-situ moisture takes longest to dissipate, and in tests at depths greater than 100 feet. Corrections based on pore pressure data also help standardize soil behavior type characterizations when CPT cones of different shapes and sizes are used.

How are these corrections calculated, and how do they work?  

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Topics: Introductory, CPT Data

Beyond the Basics: Contamination Detection and Other Applications of CPT Equipment

- Posted by VertekCPT

Vertek modular soil samplerCone Penetration Testing equipment was originally designed – and is still most commonly used – to characterize subsurface soil behavior types. But when you invest in CPT equipment, you are getting the capability to do much more. A variety of sensors and in-situ samplers can be integrated into CPT modules, making CPT equipment a versatile and efficient choice for contamination detection, environmental site assessment, and other field applications.

CPT equipment has several advantages over conventional hollow stem auger drilling and percussion drilling based methods, especially in contaminated soils. Specialized CPT tests can identify contaminants and determine the physical extent of the contamination with minimal disturbance of the soil, thus avoiding costly disposal of drill cuttings and minimizing contact between field personnel and potentially hazardous materials.

Here’s an overview of some tests and technologies that you can harness via CPT equipment:

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Topics: Soil Testing, Geotechnical Services

What is DCP testing, and how does it compare to CPT?

- Posted by VertekCPT

Vertek DCP and Data Acquisition UnitDynamic Cone Penetration (DCP) testing is used to measure the strength of in-situ soil and the thickness and location of subsurface soil layers.

It is similar to CPT in that a metal cone is advanced into the ground to continuously characterize soil behavior. However, unlike in CPT, where the cone is driven into the ground at a constant rate by varying amounts of force, in DCP, the cone is driven by a standard amount of force from a hammer, and how far the cone moves with each blow is used to determine the soil density and properties at that level.

In DCP testing, the pushing force is applied by manually dropping a single or dual mass weight (called the hammer) from a fixed height onto the push cone unit. The resulting downward movement is then measured. Unlike CPT systems, basic DCP equipment is hand-portable and may be limited to test depths of 3-4 feet: this makes it a good choice for shallow testing applications such as road bed construction and maintenance. Since DCP is essentially hand-powered, it is cheaper and more portable than CPT equipment, but the possibility of human error makes it trickier to obtain consistent and accurate data.

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Topics: Cone Penetration, Introductory, DCP

Intro to CPTu: What Can You Learn From Pore Pressure Data?

- Posted by VertekCPT


Vertek CPTu Cone and Data PackThe most basic CPT tests classify soil based on tip resistance and sleeve friction measurements. In coarse soils and shallow testing depths, this data may be sufficient to accurately characterize the soil behavior. However, most modern CPT cones incorporate a third measurement: pore water pressure. What does this measurement mean and how can it add to our understanding of soil behavior?

Pore pressure is simply a measure of the in-situ groundwater pressure, i.e. the water pressure in the “pores” between soil grains. This data is used to determine the compressibility and permeability of the soil, as well as indicating groundwater conditions. It is used to correct or “normalize” the sleeve friction and tip resistance readings in the presence of in-situ moisture and overburden stress. This is especially important in soft, fine-grained soils where in-situ moisture takes longest to dissipate, and in tests at depths greater than 100 feet.

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Topics: Cone Penetration, Introductory, Soil Testing, CPT Data

How to Read a CPT Soil Behavior Type Chart

- Posted by VertekCPT

Normalized Soil Behavior Type Zone chart with sample dataAs you analyze your CPT data, you are likely to come across several different charts designed to classify soil type based on CPT results.If you are new to the field, these charts can be a bit confusing, so here’s a brief overview of one of the more common chart types.

Soil behavior classification via CPT is fast, efficient, and frequently automated via software. Still, understanding the classification method is important, as it will help you to recognize and determine the cause of any errors or irregularities in the data.

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Topics: Cone Penetration, Introductory, Soil Testing, CPT Data

CPT 101: Determining Soil Profiles from CPT Data

- Posted by VertekCPT

CPT Cones and Data Acquisition SystemCone Penetration Testing allows the tester to identify the nature and sequence of subsurface soil types and to learn the physical and mechanical characteristics of the soil – without necessarily taking a soil sample.

How does it work?

During a CPT test, a hardened cone is driven vertically into the ground at a fixed rate, while electrical sensors on the cone measure the forces exerted on it. The zone behavior type of the subsurface layers can be extrapolated from two basic readings: cone or tip resistance and sleeve friction. 

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Topics: Cone Penetration, Introductory, CPT Data

CPT Mini Track Rig - Our Most Compact Self-Powered Rig

- Posted by VertekCPT

New - The Mini-Track Rig provides all-terrain performance at an affordable capital cost!

The latest addition to Vertek's robust line of self-propelled CPT rigs harnesses the popular 20-ton S4 Push System in a small but versatile package. 

This rubber-tracked rig is easy to maneuver, ideal for limited access areas, and maintains a low ground pressure of 4.5 psi. 

The S4 Mini-Track Rig provides a powerful carrier at an affordable price when compared to the cost of new construction equipment.

Is the Mini-Track Rig right for your application?

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Topics: S4 Push System

Is a Sieve Analysis Accurate?

- Posted by VertekCPT

introductory

sieve-analysis

If you regularly use Cone Penetration Testing on the job, you probably already know that there are a number of alternative soil testing methods out there. Some of the more common procedures include the Standard Penetration Test, which has been covered before in this blog, and the sieve analysis, also known as the gradation test. Most commonly used in civil engineering, this basic soil testing method is used to assess the particle size distribution of soil and other granular material. 

But is sieve analysis accurate?

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Topics: Introductory, Soil Testing

Financing of New CPT Equipment Now Available

- Posted by VertekCPT

We're pleased to announce a partnership with Oakmont Capital Services as our preferred lending partner allowing Vertek CPT customers in the U.S. and Canada to enter the CPT business with as litte as no money down!

oakmont_logo

Oakmont Capital Services is a full-service provider of commerical equipment financing. 

  • Application-only financing from $5,000 to $300,000
  • Most companies approved with 100% financing
  • Quick turnaround on applications with most decisions made within 2 to 4 hours
  • Competitive rates and terms (better than most banks)
  • Financing available on new/used equipment with terms from 12 to 84 months
  • Financing for start-up companies with a background in related industry
  • U.S. and Canadian customers only

Apply to finance your CPT purchase!

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Topics: Vertek Partners