Energy-based evaluation method for soil densification effects induced by vibro-compaction of stone columns

ZHOU Yanguo; WANG Chun; ZHUANG Duanyang; YAO Pengfei; ZHANG Dongchao

doi:10.11779/CJGE2024S20013

Volume 46 Issue S2

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Chinese Journal of Geotechnical Engineering > 2024 > 46(S2): 16-20. > DOI: 10.11779/CJGE2024S20013

ZHOU Yanguo, WANG Chun, ZHUANG Duanyang, YAO Pengfei, ZHANG Dongchao. Energy-based evaluation method for soil densification effects induced by vibro-compaction of stone columns[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 16-20. DOI: 10.11779/CJGE2024S20013

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Energy-based evaluation method for soil densification effects induced by vibro-compaction of stone columns

MOE Key Laboratory of Soft Soil and Geoenvironmental Engineering, Institute of Geotechnical Engineering, Center for Hypergravity Experiment and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China

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Received Date: June 20, 2024

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Abstract

Abstract

In view of the fact that the conventional ground inspection methods are not suitable for the real-time monitoring and quality check of ground improvements due to the limitations in timely and full-scale inspection, an energy-based evaluation method for soil densification effects induced by vibro-compaction of stone columns is proposed, which can timely estimate the average densification effects of soils between stone columns. Based on the propagation theory of elastic waves in foundation, a calculation procedure of energy absorbed by soils is established, and the corresponding undrained cyclic triaxial tests on a prototype silty sand are conducted to establish the empirical model for generation of the excess pore water pressure. Then a case study of a reservoir dam project is conducted. It is found that, compared with that of the field monitored excess pore water pressure and the final void ratio obtained via post-construction inspection, the prediction accuracy of the proposed method is about 90%, which preliminarily validate the feasibility of the proposed method.
- vibro-compaction of stone column,
- vibration energy,
- elastic wave,
- vibration-induced soil densification,
- excess pore water pressure

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