Civil and Environmental Engineering Commons^™

Scaling Considerations For Dynamic Experiments, R. M. Schmidt

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The geotechnical centrifuge has been shown to be a very valuable experimental technique in the investigation of explosive and impact cratering behavior. A brief summary of recent experiments is given along with a pertinent bibliography. These works have served to establish the practicality of performing dynamic experiments on the centrifuge as well as to provide a theoretical basis for their interpretation.

Behavior Of Clays Subjected To Slow Cyclic Loading And Large Strains, Adel Sada, Louise Shook

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

One of the major considerations in the design of offshore structures is the effect of wave action on the foundation. This requires a study of the effects of cyclic loading on the soil properties. The anisotropic nature of clay soils, which results from sedimentation followed by K0 consolidation, plays an important role in its dynamic as well as its static behavior. An experimental program was undertaken to determine the trends in behavior of clays subjected to large strain cyclic loading. Thin long hollow cylinders of isotropic, and normally K0 consolidated and over consolidated clays, with varying degrees of anisotropy and …

Long-Term Measurements Of Ground Motions Offshore, Eric W. Reece, David E. Ryerson, Robert L. Mcneill

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Long-Term measurements of earthquake ground motions offshore, using the Sandia National Laboratories' SEMS device which records only the strongest motions and transmits them upon command to a boat at the surface, have shown that offshore ground motions may in certain cases be substantially different from empirically predicted ground motions based on onshore data. In particular, the attenuation effects of soft and/or gassy soils, the wedging of offshore deposits as a function of direction to and distance from the source, and sharp velocity-depth profiles, are shown to be possible actors contributing to such differences. For the well constrained recording to date, …

Offshore Caissons On Porous Saturated Soil, George Gazetas, Emmanuel Petrakis

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

While currently available methods of dynamic soil-foundation interaction idealize the soil as a continuum, this paper presents a general theory to obtain the dynamic response of offshore caissons resting on a saturated or nearly saturated poroelastic medium. The model, based on Biot's theory, considers the compressibility of both solid and fluid phase and assumes that the fluid flow is governed by Darcy's Law for an isotropic medium. Results are presented as plots of normalized amplitudes of displacement load or rotation-moment ratios for a rigid strip founded on a dense coarse sand. The results demonstrate that fluid compressibility, which is primarily …

Offshore Earthquake Geotechnology — First Part, P. B. Selnes

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This first part of the paper outlines the problems encountered offshore compared to onshore. The most important difference is the presence of water which changes the dynamic behavior of structures, introduces new forces, complicates the soil investigation and visual site inspection, and changes the characteristics of the earthquake ground motion. Furthermore, the structures offshore may be much larger than most onshore facilities, and other environmental loads may act simultaneously with an earthquake.

Offshore Earthquake Geotechnology — Second Part, P. B. Selnes

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This second part of the paper discusses submarine slides and acoustic waves from earthquakes, and gives a general overview of aseismic design procedures. Problems which are specific or especially important for the offshore environment are pointed out and discussed in more detail.

Seismic Design Of The San Francisco Ocean Outfall, O. H. Gilbert Jr., Y. Eisenberg, D. D. Treadwell

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

San Francisco's Southwest Ocean Outfall will extend four miles into the Pacific Ocean. Offshore, the Outfall will cross the San Andreas Fault zone. Major design concerns for the 12-foot inside diameter reinforced concrete pipe included seismic foundation stability, backfill liquefaction, and rupture by fault displacement. Foundation stability was achieved by selection of adequate embedment depths. A coarse pervious backfill to preclude liquefaction-induced pore water pressure gradients was selected based on analyses with the computer program APOLLO. Special joints were designed within and adjacent to the fault zone to limit damage due to fault rupture and to accommodate deformations away from …

A History Of The Board Of Engineers For Rivers And Harbors, Richard G. Waugh, Judith M. Hourigan

US Army Corps of Engineers

CHAPTER I: THE BOARD IS ESTABLISHED
Theodore F. Burton • Constituting the Board

CHAPTER II: STARTING BUSINESS
First Board Members • Location • The First Reviews • Early Board Reviews • Public Hearings • Board Meetings • Expenses • Staff

CHAPTER III: THE MISSIONS OF THE BOARD
The Primary Mission • The Review Process • Assigned Missions • Planning Associates Program • Waterborne Commerce Statistics • Permanent International Association of • Navigation Congresses (PIANC) • Foreign Trade Zones • Processing Reports for State and • Washington-Level Agency Review • Former Missions • Marine Design • Transportation Economics • National Capital …

Earthquake Investigations At The Dickey-Lincoln School Damsites, Maine, Ellis L. Krinitzsky, David M. Patrick

Dickey-Lincoln School Lakes Project

The Dickey-Lincoln School damsites are less than 50 miles from an area along the St. Lawrence River which has experienced some of the most severe earthquakes in North America. A geological and seismological investigation was made of the region in order to determine the hazards from earthquakes at the damsites. No active faults were found in the general area of the damsites. The source area of potentially severe earthquakes was found to be restricted to a narrow band that follows the St. Lawrence River. This band was designated as Zone A. The boundary of Zone A is located U5 miles …

Forecasting Beach Erosion Along The Oceanic Coastlines Of The Northeast And Mid-Atlantic States, William S. Richardson

Dissertations, Theses, and Masters Projects

No abstract provided.

Optimization Of Single- And Double-Flash Cycles And Space Heating Systems In Geothermal Engineering, Talal Hussein Hassoun

Dissertations and Theses

Two different problems of optimization in the utilization of geothermal energy are presented: First, the thermodynamic optimization for a geothermal power plant using a single- or double-flash process is considered; in this analysis, the optimum flash temperature giving the maximum power output is determined. Second, an economic optimization for space heating systems using geothermal energy is developed to obtain operating conditions for which the total (capital and operating) cost is a minimum.

Both graphical and analytical methods are used in the thermodynamic optimization to determine the optimum flash temperature. The graphical method is based on thermodynamic data provided by an …

Grain Size Reconnaissance Of The Virginia-North Carolina Inner Shelf Analysis By Settling Technique, Robert Bailey Sanford Jr.

OES Theses and Dissertations

The 2-fold purpose of this study is to calibrate a Rapid Sediment Analyzer and to use it to aid in the determination of the genesis of sediment on the inner continental shelf between Cape Henry and Cape Hatteras. Rapid Sediment Analyzer calibration was conducted by comparison of sieving and settling results of similar sands.

The study area was divided into sediment provinces by both a qualitative procedure (grain size and topography) and a quantitatively procedure (factor-vector analysis). Qualitative provinces are beach and surf, upper shore face, lower shore face, sea floor, and terminal shoals. The berm fines from each terminal …

A Plane Coordinate System For Bernalillo County, Karl V. Morin

Civil Engineering ETDs

The first purpose of this thesis is to frame an enabling act that could be submitted to legislature for adoption. Such an act would authorize the use of plane coordinate system, but not make it mandatory. Twenty-four states have passed laws establishing state coordinate systems.

A second purpose of this thesis is to provide practicing engineers with all the necessary information and explanatory material in one manuscript to permit them to apply the system to their work. An example is worked out in detail using local points known to local men and fully explained step by step.

In addition to …

Some Ore Deposits In Maine And The Milan Mine, New Hampshire, William H. Emmons

Maine Collection

Some Ore Deposits in Maine and The Milan Mine, New Hampshire

by William H. Emmons

Department of the Interior, United States Geological Survey - Bulletin 432

Washington, D.C. (1910).

Contents: Introduction / Geology / Ore Deposits / Descriptions of Mines / Mines of Hancock County / Mines of Washington County / Mines in Somerset and Oxford Counties / Milan Mine, New Hampshire / Index