An Overview of Horizontal-Borehole Geophysical Techniques (Applicable in Subsurface Exploration for Underground Excavation and Heavy Construction)

In-Situ Measurement of Soil Creep
The objective of this study is to develop a field test method which allows an empirical evaluation of a creep yield stress. The method utilizes a field testing instrument referred to as...

Fracture Evaluation by the Borehole Logging Method

Behavior of Bored Piles in Beaumont Clay
Axial load tests were conducted on four full-sized instrumented bored piles in layered stiff, fissured clay in Houston, TX. The geometry and method of construction were varied in order...

Load-Deformation Mechanism for Bored Piles
An elasticity model based on the finite element method is developed for analyzing the mechanisms which govern the behavior of bored piles in stiff clay. The method can be used to predict...

Mine Subsidence and Support Methods in Pittsburgh Area
The Pittsburgh area exhibits two distinct subsidence problems: (1) Active mining at depths of 300 ft or more beneath the surface; and (2) subsidence associated with structures located...

Recent Developments in Grouting for Deep Mines
Grout-impregnated columns can be used as a means of providing support for structures built over deep mined areas. The columns can be used to maximum advantage in areas of a mine which...

Development of Tunneling Methods and Controls
Improvements in equipment and methods during the past 15 years have kept tunnel excavation costs from appreciable increases while the general construction cost index has doubled. Tunnel...

Engineering - Geologic Studies for Sewer Projects
Realization by Design Engineers that the data presented in test boring logs are often insufficient for accurate estimates and economical designs has led to preparation of more complete...

Some Experiences with Bored Piling
Some reasons for necking and waisting of bored piles in weathered inplace soils are given. Results of Van Weele's tests are compared with pullout tests to determine skin friction. Results...

Standard Penetration Test: Its Uses and Abuses
In foundation test borings, the recovery of soil samples with a 2-in. OD split sample spoon driven with a 140-lb weight falling 30 in. has been in use for more than 30 yr. Recording the...

Interpretation of Pumping Test Anomalies
Pumping test to obtain aquifer transmissibility coefficients; aquifer was poorly cemented St. Peter sandstone; time-drawdown graphs showed correct aquifer transmissibility, whereas distance-drawdown...

Geophysical Procedures in Ground Water Study
Geophysical methods of subsurface exploration developed originally for petroleum industry, apply equally well in search for ground water; methods most useful in ground water exploration...

SDR Survey for Proposed Chesapeake Bay Crossing
The application of a wide band, spark source echo sounder, the Sub-bottom Depth Recorder (SDR) to foundation studies for the proposed Chesapeake Bay Highway Crossing from Little Creek...

Geophysical Procedures in Ground Water Study
Geophysical methods of subsurface exploration developed originally for petroleum industry, apply equally well in search for ground water; methods most useful in ground water exploration...

Subsurface Explorations in Permafrost Areas
Subsurface investigation programs were undertaken in the Arctic during 1955 and 1957. Techniques which were used for obtaining permafrost samples during the two programs are described...

The Thos. H. Allen Electric Generating Station
Engineering problems resulting from natural site conditions and solution of important operating and building requirements; 865,500 kw capacity plant consists of three generating units...

A Boring Method For Pipeline Construction
This paper describes a construction method for driving of pipes below ground surface by jacking and boring. The method described is an adaptation of well drilling equipment to horizontal...

 

 

 

 

Return to search