Geotechnical

July 2005 » New & Noteworthy

Rapidly compact fills and loose soils

GeoStructures, Inc., provides Rapid Impact Compaction (RIC), a ground-improvement technology for soil densification.

Mounted on a tracked excavator, the RIC tool provides controlled impact compaction using a 7.5-ton weight, which is dropped 4 feet onto a 5-foot-diameter tamper, imparting 40 to 60 blows per minute. The resulting force, according to GeoStructures, can densify soils as deep as 20 feet.

GeoStructures, Inc.

Stabilize soil

Carmeuse North America supplies lime for short-term modification of soil properties and for long-term soil stabilization.

Lime can modify almost all fine-grained soils to reduce plasticity, moisture-holding capacity, and swell; and to improve stability to provide a solid working surface. The most dramatic improvement occurs in clay soils of moderate to high plasticity.

Soil stabilization occurs when lime is added to a reactive soil to generate long-term strength gain through a pozzolanic reaction.

Stabilization can increase a soil—€™s resilient modulus values and shear strength significantly, according to Carmeuse. Typically, 3 percent to 8 percent lime, based on dry weight of the soil, is used, depending on soil type and moisture content.

Carmeuse North America

Control and monitor grouting operations

Gannett Fleming was awarded a U.S. patent for its IntelliGrout system, an automated system that allows real-time monitoring, control, analysis, and reporting of grouting results in rock and soil. IntelliGrout performs instant and unlimited grouting program analyses and converts the information into simple, visual color displays. The system was designed to provide all of the data, documentation, and reports necessary to evaluate a grouting operation—€™s effectiveness. According to Gannett Fleming, it allows performance of grouting work more quickly, at less cost, and with better quality.

Gannett Fleming

 

Analyze lateral earth pressure

CivilTech Software offers Epres, a Windows-based software program that can analyze lateral earth pressure on a retaining structure and determine the pressure distribution, maximum pressure, total force, and failure wedge. Wall friction is considered in the calculations. Based on Coulomb—€™s theory, the program can analyze and calculate active and passive pressures. In addition, Epres can determine the earthquake-induced pressure using the Mononobe-Okabe method and the Pseudo-dynamic method. The program also handles water pressure at conditions such as seepage or no seepage, and bottom seal conditions. Users can export the output from Epres to CivilTech—€™s Shoring program for design and analysis of shoring walls.

CivilTech Software

Manage and analyze drilling data

RockWare, Inc.—€™s Drill&Log software manages geological and geotechnical drilling and piledriving data in a central database.

The program provides 2-D and georeferenced 3-D log graphics in AutoCAD DWG format, without having AutoCAD installed. Drill&Log includes a plugin for AutoCAD that enables users to create profile sections, fence diagrams, and paginated output from within AutoCAD.

External data files, such as base maps, core photos, and lab reports, also can be hosted within the Drill&Log database. In addition, the program exports single logs or entire projects in the form of an HTML archive that can be read by any web browser, including zoomable DWF vector log graphics.

RockWare, Inc.

Search online for geotechnical software

The online Geotechnical and Geoenvironmental Software Directory (www.ggsd.com) lists more than 1,600 programs in the fields of geotechnical engineering, soil mechanics, rock mechanics, engineering geology, foundation engineering, hydrogeology, geoenvironmental engineering, environmental engineering, data analysis, and data visualization. Programs are indexed by name, category, operating system, and program status (freeware, shareware, public domain, or commercial).

Software developers and suppliers also are listed by name and country. The directory, compiled mostly from information submitted by software developers, is updated about four times a year. A free newsletter is available to provide updates on new software.


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