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Your search keyword '"Baxter, Christopher D. P."' showing total 110 results
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110 results on '"Baxter, Christopher D. P."'

7. Development of a Tool for Assessing the Vulnerability of Rhode Island’s Marinas to Sea Level Rise and Storm Surge

Author

Laurent, Wendy K., primary, Brown, Nicholas, additional, Carvalho, Bradford, additional, Giles, Frank, additional, Lodge, Benjamin, additional, McBride, Kelley, additional, McGann, Charles, additional, McLaughin, Darien, additional, Peck, Jason, additional, Tierney, Dennis, additional, Swanson, Craig, additional, Spaulding, Malcolm, additional, and Baxter, Christopher D. P., additional

Published
2017
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9. Modeling of SMF tsunami hazard along the upper US East Coast: detailed impact around Ocean City, MD

Author

Grilli, Stephan T., primary, O’Reilly, Christopher, additional, Harris, Jeffrey C., additional, Bakhsh, Tayebeh Tajalli, additional, Tehranirad, Babak, additional, Banihashemi, Saeideh, additional, Kirby, James T., additional, Baxter, Christopher D. P., additional, Eggeling, Tamara, additional, Ma, Gangfeng, additional, and Shi, Fengyan, additional

Published
2014
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20. Effective Soil Density for Small-Strain Shear Waves in Saturated Granular Materials.

Author

Tong Qiu, Yanbo Huang, Guadalupe-Torres, Yaurel, Baxter, Christopher D. P., and Fox, Patrick J.

Subjects
SOIL density, SHEAR waves, GRANULAR materials, BENDER-Gestalt Test, WATERLOGGING (Soils), MODULUS of rigidity, SOIL dynamics
Abstract

This paper presents an experimental investigation of the concept of effective density for the propagation of small-strain shear waves through saturated granular materials. Bender element tests and resonant column tests were conducted on various granular materials in dry and saturated conditions. Values of small-strain shear modulus for the dry condition are compared with corresponding values for the saturated condition, which are calculated using saturated density and effective density. For bender element tests, the use of saturated density produced errors as high as 28% in the shear modulus, whereas the use of effective density resulted in errors generally less than 5%. For resonant column tests, errors in the shear modulus that were obtained using saturated density were smaller than those for bender element tests because of the lower range of excitation frequency and effect of mass polar moment of inertia of the loading system. A quick chart is provided to help users determine if effective density should be considered for a given application. Effective density is expected to be important for fine and medium sands at high-frequency excitations, such as bender element tests, coarse clean sands at lower frequencies, such as for resonant column tests, and clean gravels at essentially all frequencies of geotechnical interest. [ABSTRACT FROM AUTHOR]

Published
2015
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27. Use of [formula] as a Failure Criterion for Weakly Cemented Soils.

Author

Baxter, Christopher D. P., Ravi Sharma, M. S., Moran, Kathryn, Vaziri, Hans, and Narayanasamy, Raja

Subjects
*SOIL testing, *PORTLAND cement, *SHEAR strength of soils, *STIFFNESS (Engineering), *SOIL moisture, *STRAINS & stresses (Mechanics)
Abstract

There is considerable uncertainty in the determination of effective stress strength parameters of cemented soils from undrained triaxial tests. Large negative excess pore pressures are generated at relatively large strains (typically 4-5% for cemented silty sand) in isotropically consolidated undrained (CIU) tests, which results in gas coming out of solution during shear and significant variability in the measured peak deviator stress. In this study, different failure criteria for weakly cemented sands were evaluated based on the results of CIU and isotropically consolidated drained triaxial compression tests conducted on samples of artificially cemented sand. The use of [formula] as a failure criterion eliminates the variability between the undrained tests and also ensures that the mobilized failure strength is not based on the highly variable negative excess pore pressures. In addition, the resulting strains to failure are comparable to the strains to failure for the drained tests. Mohr-Coulomb strength parameters thus estimated from the undrained tests are generally lower than strength parameters obtained from drained tests, and the difference between the failure envelopes from undrained tests increases as the level of cementation increases. This divergence is attributed to differences in the stiffness of the cemented soil under the different loading conditions. The stiffness under undrained loading conditions decreases with increasing cementation due to an increase in the generation of positive excess pore pressure at low strains. [ABSTRACT FROM AUTHOR]

Published
2011
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28. Evaluation of cyclic resistance of providence silts using mini-cone penetration and standard penetration tests.

Author

Rhode Island. Dept. of Transportation. Office of Civil Rights, Baxter, Christopher D. P., University of Rhode Island, Rhode Island. Dept. of Transportation. Office of Civil Rights, Baxter, Christopher D. P., and University of Rhode Island

Abstract

SPR-229-2292, Most areas of coastal Rhode Island are underlain by thick layers of non-plastic silt and it is important to, know if the existing standard-of-practice liquefaction potential evaluations (e.g. Robertson and Wride (1998) or, Seed et al. (1985)) are accurate. The objective of this research was to critically evaluate the applicability of CPT, and SPT based approaches to Providence silts. This was accomplished through a laboratory testing program, involving the URI mini-cone calibration chamber and cyclic triaxial tests to develop a new relationship between, cyclic resistance ratio and tip resistance for Providence silt. The new relationship was compared to the standard-ofpractice, liquefaction potential evaluation methods from the literature. There was good agreement between the, approaches which shows that the existing field-based CPT methods are applicable to Rhode Island silts. This is, consistent with previous RIDOT funded research on the liquefaction potential evaluation of silts in Rhode Island, (Bradshaw et al. 2007; 2007a; Baxter et al. 2008)., An attempt was also made to evaluate SPT-based approaches in silt using the mini-cone and laboratory, cyclic data. A qc/N60 correlation was evaluated from two loose silt sites in Rhode Island where SPT and CPTs, were performed adjacent to each other. The agreement between blow counts and tip resistance was very poor, most, likely due to the small number of tests and small range of in situ densities. Because of the poor agreement, it was, not possible to directly evaluate the SPT-based liquefaction evaluation approaches in the study.

39. Calculations of Tsunamis from Submarine Landslides

Author

Gisler, G., Weaver, R. P., Gittings, M., Mosher, David C., editor, Shipp, R. Craig, editor, Moscardelli, Lorena, editor, Chaytor, Jason D., editor, Baxter, Christopher D. P., editor, Lee, Homa J., editor, and Urgeles, Roger, editor

Published
2010
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