Location
San Diego, California
Presentation Date
28 May 2010, 2:00 pm - 3:30 pm
Abstract
The paper describes an electrical discharge technology, applied for soil compaction around a borehole, filled with hardening grout, in operations for erection of micropiles, cast piles, soil anchors and soil nails. The technology consists in that 150-250 microsecond long electrical sparks are generated with 6-second period in borehole. The sparks have 30-40 kJ energy, which is roughly of the same order of magnitude as a pile drop hammer. But a single electrical spark has 200-250 MW because of its short duration. Such pulses compact the contact layer of soil and thus increase bearing capacity of piles, anchors or soil nails times 1.5-2.0. Electrical spark in soil is a practically non-observable event, prohibiting any instrumentation near it, which so far can only allow its qualitative investigation in water rather than in soil. The experiments in water were staged in lab on a set-up, generating 5 kJ sparks, with electronic registration of time-dependent registration of pulse behavior. It was found that longer pulse efficiency is higher and can be increased by addition of special admixtures. Full-size bored piles, micropiles and soil anchors were tested in-situ on construction sites, having various soil conditions. The test data yielded that pile (anchor, nail) bearing capacity could be increased times 1.5-2.0 by high-energy electrical spark treatment, as compared to conventional technology (without electrical spark treatment).
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Dzhantimirov, Kh. A.; Rytov, S. A.; and Kryuchkov, S. A., "Application of High-Power Electrical Sparks for Dynamic Compaction of Soil" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 1.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session07/1
Included in
Application of High-Power Electrical Sparks for Dynamic Compaction of Soil
San Diego, California
The paper describes an electrical discharge technology, applied for soil compaction around a borehole, filled with hardening grout, in operations for erection of micropiles, cast piles, soil anchors and soil nails. The technology consists in that 150-250 microsecond long electrical sparks are generated with 6-second period in borehole. The sparks have 30-40 kJ energy, which is roughly of the same order of magnitude as a pile drop hammer. But a single electrical spark has 200-250 MW because of its short duration. Such pulses compact the contact layer of soil and thus increase bearing capacity of piles, anchors or soil nails times 1.5-2.0. Electrical spark in soil is a practically non-observable event, prohibiting any instrumentation near it, which so far can only allow its qualitative investigation in water rather than in soil. The experiments in water were staged in lab on a set-up, generating 5 kJ sparks, with electronic registration of time-dependent registration of pulse behavior. It was found that longer pulse efficiency is higher and can be increased by addition of special admixtures. Full-size bored piles, micropiles and soil anchors were tested in-situ on construction sites, having various soil conditions. The test data yielded that pile (anchor, nail) bearing capacity could be increased times 1.5-2.0 by high-energy electrical spark treatment, as compared to conventional technology (without electrical spark treatment).
