ASTM D7400 PDF

Full Description 1. A preferred method intended to obtain data for use on critical projects where the highest quality data is required is included. Also included is an optional method intended for use on projects which do not require measurements of a high degree of precision. Other items addressed include source-to-receiver spacing, drilling, casing, grouting, a procedure for borehole installation, and conducting actual borehole and seismic cone tests. Several types of commercially available receivers and recording systems can also be used to conduct an acceptable downhole survey. Special consideration should be given to the types of receivers used and their configuration.

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More D Accurate in-situ P-wave and S-wave velocity profiles are essential in geotechnical foundation designs. These parameters are used in both analyses of soil behavior under both static and dynamic loads where the elastic constants are input variables into the models defining the different states of deformations such as elastic, elasto-plastic, and failure.

Another important use of estimated shear wave velocities in geotechnical design is in the liquefaction assessment of soils. Another assumption inherent in the test methods is that the stratigraphic medium to be characterized can have transverse isotropy.

Transverse isotropy is a particularly simple form of anisotropy because velocities only vary with vertical incidence angle and not with azimuth. Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results.

Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Scope 1. These test methods are limited to the determination of the interval velocities from arrival times and relative arrival times of compression P waves and vertically SV and horizontally SH oriented shear S seismic waves which are generated near surface and travel down to an array of vertically installed seismic sensors.

Two methods are discussed, which include using either one or two downhole sensors receivers. Other items addressed include source-to-receiver spacing, drilling, casing, grouting, a procedure for borehole installation, and conducting actual borehole and seismic cone tests. Several types of commercially available receivers and recording systems can also be used to conduct an acceptable downhole survey.

Special consideration should be given to the types of receivers used and their configuration to provide an output that accurately reflects the input motion. These test methods primarily concern the actual test procedure, data interpretation, and specifications for equipment which will yield uniform test results. In addition, they are representative of the significant digits that should generally be retained. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering design.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. In this system, the pound lbf represents a unit of force weight , while the unit for mass is slugs. This implicitly combines two separate systems of units; that is, the absolute system and the gravitational system.

It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

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ASTM D7400

Two methods are discussed, which include using either one or two downhole sensors receivers. Other items addressed include source-to-receiver spacing, drilling, casing, grouting, a procedure for borehole installation, and conducting actual borehole and seismic cone tests. Several types of commercially available receivers and recording systems can also be used to conduct an acceptable downhole survey. Special consideration should be given to the types of receivers used and their configuration to provide an output that accurately reflects the input motion.

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More D Scope 1. A preferred method intended to obtain data for use on critical projects where the highest quality data is required is included. Also included is an optional method intended for use on projects which do not require measurements of a high degree of precision. Other items addressed include source-to-receiver spacing, drilling, casing, grouting, a procedure for borehole installation, and conducting actual borehole and seismic cone tests. Several types of commercially available receivers and recording systems can also be used to conduct an acceptable downhole survey.

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Want this as a site license? Changes from the previous issue A redline edition is available for this document, with all changes visible. Ask Document Center Inc. Scope 1. These test methods are limited to the determination of the interval velocities from arrival times and relative arrival times of compression P waves and vertically SV and horizontally SH oriented shear S seismic waves which are generated near surface and travel down to an array of vertically installed seismic sensors. Two methods are discussed, which include using either one or two downhole sensors receivers. Other items addressed include source-to-receiver spacing, drilling, casing, grouting, a procedure for borehole installation, and conducting actual borehole and seismic cone tests.

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