Geotechnical products

July 2006 » New & Noteworthy
Geotechnical products and services.
CE News Staff

Soil-cement for commercial sites

Soil-cement—the topic of a brochure titled, Soil-Cement for Commercial Sites, available from the Portland Cement Association (PCA)—can reduce subgrade stresses and rutting while providing pavement that grows stronger with age. Workers can recycle the existing pavement into a new base by breaking up and pulverizing failed pavement, then treating it with cement. According to the PCA, in addition to being a low-cost alternative for heavy-duty industrial pavements, soil-cement offers environmental advantages because soil-cement projects generally have no disposal problems and they conserve high-grade aggregate materials. There are thousands of miles of soil-cement pavements in every U.S. state.

Portland Cement Association
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Liquefaction mitigation

Ellington Cross, geotechnical engineers and contractors, offers Earthquake Drains for mitigating liquefaction of loose, cohesionless soils during seismic events. The high flow-capacity vertical drains, comprised of a polypropylene core wrapped with a geotextile filter fabric, provide a path for the rapid dissipation of seismically induced excess pore pressures and eliminate or minimize seismic settlements. According to the company, vibratory installation of Earthquake Drains densifies the soil, increasing its cyclic shear resistance. Typical spacing for Earthquake Drains ranges from 3 feet to 6 feet, center-to-center, depending on the earthquake magnitude and the soil's permeability and relative density. According to Ellington Cross, installation costs typically are half those of comparative methods such as stone columns and grouting.

Ellington Cross LLC
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Tunnel construction surveying

The Leica Tunnel Measurement System (TMS) uses a Leica TPS1200 series reflectorless robotic total station and newly developed onboard and office application programs. The TMS application programs include TMS SETout, TMS PROfile, and TMS Office. TMS SETout can be used on a mobile tripod for one-man setout or as a stationary console-mounted, motorized, round-the-clock surveyor. TMS PROfile provides automatic profile measurement for precise geometric information, exact profile compliance, and reliable calculations for quantity surveying. TMS Office is used for tunnel profile design; provides multiple TMS applications, all running within a single database; and encompasses management of all measurements, setout, and survey point data.

Leica Geosystems, Inc.
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Prefabricated drainage

The Eljen Prefabricated Drainage System (PDS) reduces hydrostatic pressure behind retaining walls and next to foundation walls by intercepting subsurface water and collecting and rechanneling the flow. They also can be used for highway edge drains. The Eljen PDS is a preconstructed unit, custom-sized for the installation, consisting of a two-sided cuspated plastic core wrapped in a drainage fabric, with a perforated, corrugated drainage pipe at the bottom. No stone is required; the fabric protects the enclosed drain pipe from soil clogging. According to the company, the two-sided core provides larger total surface area, as well as drainage on both sides of an installation.

Eljen Corp.
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CAD update offers reference and visualization enhancements

Bentley Systems recently released MicroStation V8 XM Edition, which offers full support for existing V8 standards, as well as an unchanged DGN file format, but has a number of new features. Reference enhancements allow users to attach a PDF reference to a design file, dynamically manipulate reference clipping boundaries with handles, and attach multiple instances of the same model at different stages of development using Design History. Design History allows users to isolate and view any change or set of changes to a design, as well as record, review, and restore modifications. A new display subsystem in MicroStation V8 XM Edition leverages Microsoft DirectX technologies to increase view and navigation speed in 2-D and 3-D designs.

Modeling advancements allow the creation of parametric 3-D geometry, mesh modeling for creating lightweight structures, and new handles for intuitive and interactive viewing. Improved visualization capabilities offer photo-realistic rendering and new animation tools. Additionally, built-in technology provides an entry-level collaboration tool to manage, find, and share CAD and geospatial content using Microsoft Office SharePoint technologies.

Bentley Systems, Inc.
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Web-mapping and authoring applications build on open source platform

Autodesk recently released MapGuide Enterprise 2007, the commercial version of its open source web-mapping platform, MapGuide Open Source, an active open source project hosted by the Open Source Geospatial Foundation (http://www.osgeo.org).

MapGuide Enterprise 2007 features all of the benefits of the open source version, plus additional quality assurance, technical support, connectivity to additional data sources, and integration of numerous third-party components. According to Autodesk, specific customer benefits of an Autodesk MapGuide Enterprise subscription include the ability to contact web support with unlimited incidents, connect to Oracle and SQL Server databases, integrate third-party components such as the Mentor coordinate system, and access continual enhancements from Autodesk through regular updates. The software offers server-side programming and application delivery and support for simultaneous connections to multiple database servers. A choice of two viewing tools—Autodesk DWF Viewer or AJAX Viewer—support either vector-based or raster-based maps.

Also available is Autodesk MapGuide Studio 2007, an authoring environment for creating and publishing maps and related data with the open source or commercial versions of MapGuide. Users can build stylized layers and make attractive maps by configuring settings, color, display attributes, labels, URLs, pop-up menus and more.

According to Autodesk, it is then simple to add maps to existing applications, publish on the Internet, or customize for enterprise, municipal, or field use. Autodesk MapGuide Studio users have full control over toolbars and menus; can use dozens of pre-made functions such as Zoom, Pan, and Select; and can define custom buttons and menus. Autodesk MapGuide Studio streamlines aggregation and publishing of geospatial data; allows for rapid map creation and customization by leveraging previously authored maps and drawings; and negates the need to use different tools for loading data types, connecting to databases, and publishing to the web.

Autodesk, Inc.
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