2011 7 7 154 JOURNAL OF RAILWAY ENGINEERING SOCIETY Jul 2011 NO. 7 Ser. 154 1006-2106 2011 07-0009 - 07 1 1 2 1 2 2 2 1. 102600 2. 730060 3% ~ 8% 8 500 kn m 10 000 kn m 15 000 kn m 15 000 kn m 15 000 kn m 15 000 kn m 9. 5 m 15. 5 m 2 P56 A Experimental Research on the High Energy Level Dynamic Compaction with Humidification Operation to Collapsible Loess in the Arid Region in Northwest China HE Shu - jun 1 LI Hong - jiang 1 ZHAO Min - xue 2 ZHAO Wei - tao 1 Wang Lan - xing 2 LUO Lian - bao 2 HE Wan - pu 2 1. The Institute of Foundation Engineering of China Zhonhua Geotechnical Engineering Co. Ltd Beijing 102600 China 2. Lanzhou Huanqiu Contracting & Engineering Corporation Lanzhou Gansu 730060 China Abstract Research purposes The collapsible loess in the northwest arid area is relatively dry and its moisture content is 3 to 8% so it is generally believed that it is needed for humidification treatment with the energy level below 8 500 kn m in the current specification standard to treat collapsible loess found directly because of the effect of poor compaction relatively small effect depth. At present it is less than that the dynamic compaction with more than high energy level more than 10 000 kn m to collapsible loess in the arid region in Northwest China and it is hardly reported that the high energy level dynamic compaction combined with humidification operation to collapsible loess was carried out. Therefore Contrast testing study on 15000 kn m high energy level dynamic compaction to collapsible loess with 15 000 kn m high energy level dynamic compaction with humidification operation in the arid region in Northwest China was performed based on the large oil storage tank projects constructed by the country on Collapsible 2011-05 - 10 No. 2009. 01. 1974
10 2011 7 Loess. And a suitable construction process on high energy level dynamic compaction combined with humidification operation in the northwest arid collapsible loess area will be hoped to probed. Research conclusions The results by testing study showed that the collapsible depth to be eliminated under 15 000 kn m high energy level dynamic compaction to collapsible loess directly and 15 000 kn m high energy level dynamic compaction combined with humidification operation was separately up to 10 m 15 m its strength parameters were nearly 2 times more improvement. A suitable construction process on high energy level dynamic compaction combined with humidification operation in the northwest arid collapsible loess area was probed by this experimental study and it is a reference for similar ground treatment project. Key words the arid region in Northwest China collapsible loess high energy level dynamic compaction humidification operation 1-1 11 8 500 kn m 1. 1 10 000 kn m 4-8 9 24 24 m 2 1% ~ 3% 1 10% 3% 3% ~ 8% 3 10 1. 2 18 000 kn m 14. 0 ~ 15. 1 m 25 000 kn m 11-12 11. 0 ~ 14. 0 m 1 6. 0 m 2 9. 0 m 1 0. 003 ~ 0. 207 0. 002 ~ 0. 210 60 kpa 4 MPa 2 0. 001 ~ 15 000 kn m 0. 189 0. 005 ~ 0. 151 9. 5 m 120 kpa 8 MPa 15 000 kn m Ⅱ ~ Ⅳ 15. 5 m 6% ~ 9% 2 1. 3 2 1 1
7 11 1 / kn m 15 000 20 cm 18 15 000 4 m 4 m 20 cm 18 6 000 10 cm 8 2 000 1 /4 - - 2 2 1 ~ 2 2. 2 2. 1 2 2 2 /m /m /m 16 13 ~ 16 3. 70 0. 75 9 13 3. 17 0. 50 24 8-2 2. 14 0. 40 2. 3 2 3 3 2 11 0. 10 m /m /% / g cm 3 e /MPa δ s 12 1. 0 7. 6 1. 55 0. 746 24. 9 0. 014 2. 0 6. 6 1. 59 0. 699 21. 2 0. 013 12 3. 0 9. 4 1. 71 0. 585 31. 7 0. 004 4. 0 8. 6 1. 59 0. 701 28. 4 0. 007 16 5. 0 7. 4 1. 55 0. 743 19. 4 0. 013 3. 23 ~ 4. 21 m 3. 69 m 6. 0 11. 9 1. 55 0. 753 19. 5 0. 014 7. 0 9. 6 1. 57 0. 727 19. 2 0. 011 8. 0 10. 2 1. 53 0. 767 25. 2 0. 014 2 9. 0 10. 9 1. 46 0. 855 37. 1 0. 026 11 0. 10 m 10. 0 5. 3 1. 51 0. 795 17. 9 0. 045 10 11. 0 7. 8 1. 46 0. 861 20. 7 0. 044 12. 0 7. 5 1. 48 0. 832 20. 4 0. 026 13. 0 8 1. 51 0. 796 15. 0 0. 022 11 14. 0 5. 3 1. 47 0. 841 20. 5 0. 015 9 15. 0 8. 9 2. 96 ~ 3. 42 m 3. 08 m 1. 52 0. 789 17. 9 0. 022 3 8. 0 m 0. 6 m 8 0. 015 8. 0 m 4 MPa 8 MPa 2 ~ 4 1. 65 m 1. 65
9. 5 m 3 12 2011 7 3. 1 15 000 knm h m 3. 1. 1 3. 1. 2 100 ~ 127 mm 3. 5 ~ 6. 5 m 8 m 4. 0 ~ 7. 5 m 11 ~ 14 m 5% 12 m 10-5 m /s 20 ~ 30 cm 30 ~ 40 cm 3 1 10 cm 10-5 m /s3 2. 59 m 20 ~ 30 cm 3 21 m 3 5. 1 m 3 ~ 5 d 4 m 1 1. 3 ~ 1. 5 42 13 d 800 4 1. 5 10-5 m /s 3 3. 38 m 7 d A 3 1 m B 2 m C 3. 38 m 12 m 2. 8 m 4 8 m 4 17. 5% 3% ~ 4% ω op = 14. 5% /m /% /% /% 6% ~ 9% 1. 00 A - 1 21. 43 B - 1 22. 00 C - 1 8. 21 ω 2. 00 A - 2 24. 19 B - 2 22. 40 C - 2 7. 62 = 7% 3. 00 A - 3 22. 26 B - 3 23. 90 C - 3 8. 96 ρ = 1. 56 g /cm 3 9 4. 00 A - 4 16. 69 B - 4 21. 60 C - 4 10. 35 Q = ω op - ω ρ 1 + ω h A A m 2 3 ~ 5 d Q = 21 m 3 1. 3 m 3 4. 50 - - B - 4-1 8. 70 - - 5. 00 A - 5 13. 20 B - 5 13. 30 C - 5 10. 60 Q m 3 6. 00 A - 6 13. 40 B - 6 13. 20 C - 6 20. 67 7. 00 A - 7 12. 10 B - 7 11. 30 C - 7 7. 74 ω op % 8. 00 A - 8 12. 50 B - 8 10. 30 C - 8 16. 77 ω 9. 00 A - 9 11. 40 B - 9 9. 80 C - 9 15. 16 % 10. 00 A - 10 13. 40 B - 10 13. 40 C - 10 13. 50 ρ 11. 00 A - 11 12. 90 B - 11 11. 80 C - 11 16. 60 g /cm 3 12. 00 A - 12 14. 40 B - 12 12. 40 C - 12 14. 92
7 13 4 ~ 5 m 4 6% ~ 7% 2% ~ 4% 3. 2 1 4 m 4 m 5 4 m 5m 3 4 4 15 0. 20 m 15 ~ 16 14 3. 37 ~ 7. 58 m 3. 85 m 4 3 12 20 3 16 0. 20 m 4. 6 m 16 ~ 18 5 3. 3 3. 08 ~ 4. 6 m 3. 45 m 14 5 17 0. 4 m 8 3 d 16 2 3 0. 2m 3. 4 2
14 2011 7 5 13. 0 m 1. 82 m /m /m /m 14. 82 m 14 13 ~ 16 3. 85 1. 05 5 13 3. 45 0. 37 17 8-2 2. 87 0. 40 1. 82 15. 5 m 20 MPa 23. 6 MPa 4 MPa 8 3 ~ 5 3. 5 520 kpa 6 3 5 6 26. 84 mm 30. 05 mmp - S S D B S /D S /B = 0. 010 fak 270 kpa fak 220 60 kpa 120 kpa 2 ~ 4 4 10% ~ 12% 6. 0 m 2 6 6 2 /% N /MPa /m /m /kpa - 6 ~ 9 - - 4 60-6 ~ 9 - - 8 120 9. 5 8. 33 11 ~ 12 0. 2 22. 6 270 15. 5 12. 18 15 ~ 17 0. 2 28. 0 220 6 15 000 kn m
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