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Golden, CO, United States

Williams A.S.,Kleinfelder , Inc.
44th US Rock Mechanics Symposium - 5th US/Canada Rock Mechanics Symposium | Year: 2010

As part of the feasibility evaluation of the Irvine-Corona Expressway Tunnels (ICE), closed-form analytical solutions developed by Hoek were used to estimate the potential for the rock mass to squeeze during mining and tunnel construction along the proposed tunnel corridor. The results using Hoek's method were compared with an empirical method developed by Goel et al., which utilizes the Rock Mass Quality (Q). Both of these methods predict that the rock mass will exhibit squeezing; however, the Goel et al. method predicts that the rock mass will exhibit squeezing at tunnel depths beyond 180 m regardless of lithology, while results using Hoek's method predict a range of critical depths from 50 to 470 m depending on lithology. Copyright 2010 ARMA, American Rock Mechanics Association. Source


Woodward N.R.,Kleinfelder , Inc. | Tinjum J.M.,University of Wisconsin - Madison | Wu R.,University of Wisconsin - Madison
Geotechnical Testing Journal | Year: 2013

This study investigated water redistribution during measurement of the thermal dry-out curve (i.e., soil thermal resistivity QT versus volumetric water content h). Although there is not a standard method for measuring the QT-h relationship, curves are typically generated with incremental QT measurements as a specimen is dried. However, drying within a specimen may not be uniform, even in a controlled, lowtemperature drying environment. In this study, QT and h were measured at the top, middle, and bottom of remolded cylindrical soil specimens of a range of soil types after staged drying in a low-temperature oven. Water distribution was highly varied; for example, tests on silty sand revealed h values up to nine times greater at the bottom than at the top of the specimen, and spatial variations in h erroneously affect measured values of QT. Numerical models validated water migration within soil specimens during staged drying. The results indicate a need for modification of the standard thermal resistivity testing procedure to account for variations in water content across a specimen and along the sensor length during drying. Copyright © 2013 by ASTM International. Source


Textor N.,Burns and McDonnell | Backlund E.,Kleinfelder , Inc.
Geotechnical and Structural Engineering Congress 2016 - Proceedings of the Joint Geotechnical and Structural Engineering Congress 2016 | Year: 2016

Subsurface conditions for a combined cycle combustion plant in Warren County, Virginia were dominated by karst geology. Active sinkholes, numerous soil-, water-, and air-filled voids in the limestone bedrock, and highly varying rock surfaces associated with karst activity were present. To better characterize the site conditions, an extensive subsurface investigation with multiple phases was performed. Specific design and construction approaches were developed and utilized based on the site conditions to ensure the foundations would properly support the structures. A foundation type selection matrix was developed based on the results of the geotechnical investigation and structure-specific characteristics to consistently evaluate and quantify the level of risk associated with the foundation type selected for each piece of equipment. The use of the foundation type selection matrix aided in selecting a combination of micropile supported foundations and shallow foundations based on the risk of failure associated with each structure. A load testing program and full-Time construction observation were employed to confirm micropile design and construction. © ASCE. Source


Siegel B.,Kleinfelder , Inc.
ENR (Engineering News-Record) | Year: 2013

William C. Siegel, the president and CEO of The Kleinfelder Group Inc., San Diego, feels that there is a need for the US government to increase the gas tax. He provides three reasons for the taxes to be increased. First, there is the rough condition of many roads. Second, the current gas tax is not sufficient to fund even the minimal levels of transportation infrastructure currently planned. Finally, a gas tax is, in effect, a user fee, and it only makes sense that users pay for the use of the infrastructure. The current gas-tax format, in which the tax is charged per gallon, is far from perfect, but it's acceptable. But the author would argue that if the gas tax is raised, the government must index it to inflation. Even if Congress passes an increased gas tax in one form or another, the government can't stop working on long-term funding solutions, including alternative ways to collect appropriate user fees. Source


Allen K.,Kleinfelder , Inc.
Hydrocarbon Processing | Year: 2014

It is not unusual for some hydrocarbon processors to make environmental compliance activities a lower priority than daily operational needs, such as plant maintenance, product flow and product transport. After all, compliance does not directly generate profit. Although not all owners/operators intentionally ignore environmental compliance, this mode of operating has been seen in the industry throughout the years—until now. © 2014 Hydrocarbon Processing. Source

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