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PS Suspension Logger for Offshore Site Investigations
The PS suspension logger measures compression wave velocities and formation shear velocities of surrounding rock and soil from within deep uncased boreholes …
Source: www.geoquip-marine.com
Date Published: 7/8/2022
View: 1102
Suspension P-S Logging for Geophysical Investigation of …
Suspension P-S logging is one of the available methods for determining the shear and compression wave velocity (VS and VP) profiles in both …
Source: ascelibrary.org
Date Published: 5/12/2021
View: 8646
Phase velocity approach for Suspension P–S Logging data …
A new data reduction method based on borehole acoustic waves is proposed for Suspension P-S Logging data. •. The proposed method is more objective and can be …
Source: www.sciencedirect.com
Date Published: 7/6/2022
View: 6812
P-S suspension logging borehole b-2 Clinton nuclear power …
The suspension logging system directly determines the average velocity of a segment of the soil column surrounding the borehole of interest by.
Source: www.nrc.gov
Date Published: 4/21/2021
View: 9592
The Suspension PS Velocity Logging System – OnePetro
The Suspension P-S Logging System is a new technique for measuring P and S-wave velocities in deep boreholes. The characteristic feature of …
Source: onepetro.org
Date Published: 9/15/2021
View: 1620
PS-Logging – Igeotest
The P-S Logging or suspension survey is a low-frequency acoustic probe which can measure compression and rotational wave velocity using indirect excitation.
Source: www.igeotest.com
Date Published: 5/2/2021
View: 2702
History – PSLogger
The history of the PS Logger® is one of continuous development, beginning in 1979 … The new system was introduced by OYO as Suspension S Wave logging:.
Source: pslogger.com
Date Published: 7/20/2022
View: 351
(PDF) Use of PS Logging and Ground Response Analysis …
amplifications, seismic wave velocities determination is necessary. The paper deals with the use of PS Suspension Logging Downhole. Seismic …
Source: www.researchgate.net
Date Published: 6/22/2021
View: 7529
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주제에 대한 기사 평가 ps suspension logging
- Author: Hoài Hân Lê
- Views: 조회수 1,195회
- Likes: 좋아요 8개
- Date Published: 2019. 12. 23.
- Video Url link: https://www.youtube.com/watch?v=5Y_vvrghvaU
PS SUSPENSION LOGGER
PRECISION DATA ON SOIL & ROCK PHYSICAL PROPERTIES
The PS suspension logger measures compression wave velocities and formation shear velocities of surrounding rock and soil from within deep uncased boreholes. This is used to determine the physical properties of soil and rock including shear modulus, bulk modulus, compressibility and Poission’s ratio.
The probe of the PS suspension logger has around 100x the output energy of a conventional borehole sonic. This makes it highly effective in soft soils and other attenuating formations where conventional full-waveform sonics often perform poorly.
This is the only method that obtains both P- and S-wave velocity data reliably in single holes at depths greater than 60 metres and has been used down to 600 metres.
Data is in high resolution (typically 1m) and can therefore be used to resolve thin layers that can have a dramatic effect on surface response.
Acquired data is recorded in the industry standard SEG2 format and is processed using specialized software, allowing users to conduct a series of analysis tasks.
Suspension P-S Logging for Geophysical Investigation of Deep Soil and Bedrock
Abstract
Suspension P-S logging is one of the available methods for determining the shear and compression wave velocity (V S and V P ) profiles in both soil and rock formations. Measurements are made in single, uncased, fluid-filled boreholes. for nuclear power plants, nuclear regulatory guides provide guidance on conducting various field investigations to determine the site characteristics for the licensing of new generation units. Although these guides discuss surface and borehole geophysics to some extent, they do not specifically reference the suspension P-S logging method. However, because this method provides a specific measure of V S and V P at any chosen depth in the borehole (rather than interpretation from surface methods or integration through the soil column), it has been used as the main source of obtaining these velocities during site investigation and characterization for new nuclear generation work. This paper discusses the advantages (and some disadvantages) of this method for measuring V S and V P over down-hole (conventional and CPT) and cross-hole testing procedures. The results of multiple suspension P-S logging measurements are presented for two different sites, in soils and rocks that range from soft clays to silty sand to partially weathered/sound rock, to depths of over 120 m.
The Suspension PS Velocity Logging System
INTRODUCTION
IMPORTANCE OF THE S-WAVE MEASUREMENT
Elastic properties of a geological stratum or formation can be determined from Sand P-wave velocities and from supplementary information of densities. S-wave velocity is directly related to the rigidity modulus which represents strength parameter of the formation. Generally, low S-wave velocity means low strength of the formation. Therefore, measuring the velocity of a subsoil layer is important, not only for resources exploration, but also for foundation and earthquake engineering studies.
In earthquake engineering, a response analysis of the seismic waves can be made by using S-wave velocities of the surface layers. For most structures, the required depth for S-wave velocity investigation is between 30 meters and-100 meters. For structures subject to dynamic or cyclic stress conditions, S-wave velocity information can be used when making a dynamic design for the foundation. For example, an offshore structure that will receive a cyclic force from wind, waves, or tidal currents, it is necessary to study a soil-structure interaction under such a cyclic loading condition. A necessary depth to be investigated for such an engineering problem may be between 30 meters and 100 meters. For a structure such as a nuclear power plant, more careful investigation is required and investigations from 200 to 500 meters deep need to be made.
For the purpose of exploration for the fluid reservoirs including oil, gas, ground-water and geothermal fluid, reflection seismic techniques are well established. Interest in deep S-wave logging in this area may be based on the fact that the propagation properties of S-wave are sensitive to conditions of pores and fractures in formations regardless of the contained fluid condition, and by which P-wave properties are strongly affected. Both P and S-wave velocities would be useful when evaluating the pore and fracture conditions of a formation. The required depth for this area may be very deep for up to 3 to 5 thousand meters.
Igeotest
The P-S Logging or suspension survey is a low-frequency acoustic probe which can measure compression and rotational wave velocity using indirect excitation. Allows high resolution P & S wave measurement at depths of up to 1000 m. Recommended for soils and soft rocks.
Advantages
PSLogger
The new system was introduced by OYO as Suspension S Wave logging:
The updated development of 1984 improved the structure of the source to generate both P-wave and S-wave with the “new Suspension PS Logging System” being introduced:
A new source of improved efficiency called HS Source was introduced and development, sales and manufacture was transferred exclusively to Robertson Geo in 1988:
Robertson Geo has continually developed and updated the PS Logger® with customers and its own service teams deploying the system globally acquiring important high value data from many thousands of boreholes.
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