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In large-scale constructions, more and more ultra-soft soil foundation treatments are faced. The treatment purpose is to discharge as much as possible the pore water in the soft soil and make it consolidated, so as to improve its physical and mechanical performances. The static and dynamic drainage consolidation method is tried to use high-energy impact and convert part of the combined water in the ultra-soft soil into free water, and thus achieve more water discharge and effective consolidation. However, it is unclear what level and rate of the impact load could cause the water phase to change. For this, based on the tests with different load level and rate for the ultra-soft soil under simulated engineering condition, water phase test of the soil by nuclear magnetic resonance (NMR) was carried out, in order to explore the rules or conditions under which the combined water in this ultra-soft soil could be converted into free water at typical load level and rate. Our main conclusion is that: (1) corresponding to the engineering usual load, true tri-axial test at low load rate and level (1.6 MPa/s, the 100 kPa), the combined water in the ultra-soft soil cannot be converted into free water; (2) corresponding to the condition of high-speed impact load (a3787 kPa load level per blow and a rate of 631.2 MPa/s) used in the static and dynamic drainage consolidation method, the combined water in the ultra-soft soil could be converted into free water; and the greater the total impact energy, the easier the conversion into free water; (3) the effect of constraint sample confining stiffness on the conversion of combined water to free water can be ignored.
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Keywords:
- load level and rate /
- ultra-soft soil /
- NMR test /
- water phase change
[1] Editorial The Third International Meeting on MR Applications to Porous Media 1996 Magn. Res. Ima. 14 697
[2] McDonald P J, Rodin V, Valori A 2010 Cemt. Concr. Res. 40 1656
[3] Zhang C D, Pang Y L 2006 Chin. J. Eng. Geophys. 3 1 (in Chinese) [张昌达, 潘玉玲 2006 工程地球 3 1]
[4] Deng K J 2010 Theory and Application of Nuclear Magnetic Resonance Logging (Dongying: China University of Petroleum Press) (in Chinese) [邓克俊 2010 核磁共振测井理论及应用(东营: 中国石油大学出版社)]
[5] Bao S L, Du J, Gao S 2013 Acta Phys. Sin. 62 88701 (in Chinese) [包尚联, 杜江, 高嵩 2013 62 88701]
[6] Shen G P, Cai C B, Cai S H, Chen Z 2011 Chin. Phys. B 20 103301
[7] Ren T T, Luo J, Sun X P, Zhan M S 2009 Chin. Phys. B 18 4711
[8] Xu J W, Chen Q H 2012 Chin. Phys. B 21 40302
[9] Li Z M 2011 Strengthening and Quality Control of Soft Soil Foundation (Beijing: China Building Industry Press) p185 (in Chinese) [李彰明 2011 软土地基加固与质量控制(北京: 中国建筑工业出版社)第185页]
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[1] Editorial The Third International Meeting on MR Applications to Porous Media 1996 Magn. Res. Ima. 14 697
[2] McDonald P J, Rodin V, Valori A 2010 Cemt. Concr. Res. 40 1656
[3] Zhang C D, Pang Y L 2006 Chin. J. Eng. Geophys. 3 1 (in Chinese) [张昌达, 潘玉玲 2006 工程地球 3 1]
[4] Deng K J 2010 Theory and Application of Nuclear Magnetic Resonance Logging (Dongying: China University of Petroleum Press) (in Chinese) [邓克俊 2010 核磁共振测井理论及应用(东营: 中国石油大学出版社)]
[5] Bao S L, Du J, Gao S 2013 Acta Phys. Sin. 62 88701 (in Chinese) [包尚联, 杜江, 高嵩 2013 62 88701]
[6] Shen G P, Cai C B, Cai S H, Chen Z 2011 Chin. Phys. B 20 103301
[7] Ren T T, Luo J, Sun X P, Zhan M S 2009 Chin. Phys. B 18 4711
[8] Xu J W, Chen Q H 2012 Chin. Phys. B 21 40302
[9] Li Z M 2011 Strengthening and Quality Control of Soft Soil Foundation (Beijing: China Building Industry Press) p185 (in Chinese) [李彰明 2011 软土地基加固与质量控制(北京: 中国建筑工业出版社)第185页]
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