29 2 2010 6 GLOBAL GEOLOGY Vol. 29 No. 2 Jun. 2010 1004-5589 2010 02-0341 - 06 1 2 3 4 5 6 1. 130032 2. 130012 3. 134000 4. 130021 5. 130012 6. 130012 1# 2# TU473 A doi 10. 3969 /j. issn. 1004-5589. 2010. 02. 024 Analysis on construction application of lager diameter pile foundation engineering in Guangdong coastal areas CHEN Zhong-zhi 1 QU Shi-dong 2 ZHANG Gong-shu 3 ZHANG Xue-zhong 4 ZHANG Jun-sheng 5 HU Ru-si 6 1. Capital Construction Office Changchun Normal College Changchun 130032 China 2. Electronic Science and Engineering College Jilin University Changchun 130012 China 3. Tonghua Design Institute of Water Conservancy and Hydroelectric Power Tonghua 134000 Jilin China 4. China Municipal Engineering Northeastern Design Institute Changchun 130021 China 5. Science and Technology Park Jilin University Changchun 130012 China 6. Logistics Group Jilin University Changchun 130012 China Abstract The overlying strata of building foundation in Guangdong coastal areas are silty soil mud muddy soil contains gravel sand gravel sand strong and medium weathered granite and with corrosive groundwater and complex geological conditions. Taking the foundation of 1# and 2# units desulphurize engineering technology building of Zhuhai power plant as example the authors introduced the applicaton of large diameter pile foundation engineering in this area systematically and analyzed the design and calculation of lager diameter pile foundation engineering and the technical points technical difficulties and quality guarantee measures of punch pile foundation engineering. The reliability and security of this foundation engineering has been verified through the detection by relevant departments. The successful application of this project provides direct practical data for large diameter pile foundation engineering application in the coastal areas of South China. Key words Guangdong coastal areas lager diameter pile pile foundation engineering 2009-07-28 2010-01-19
342 29 0 1# 2# 1. 2 1 - - 1 2 Rr 1 f ak 1. 1 1# 2# Cu 3 Table 1 1 Formation conditions of construction site /m 1-1 - 1 1-2 20% ~ 30% 5 ~ 25 cm > 30 3. 6 ~ 8. 0 0. 5 ~ 1. 9 2-3 - 4-40% 1. 5 ~ 2. 7-4. 1 ~ 11. 0 1. 0 ~ 4. 8 5-1 0. 6 ~ 3. 0 5-5 - 2 20% ~ 30% 1. 3 6-7 - 8-0. 5 20% ~ 38% 1. 3 ~ 3. 7 8-1 0. 4 ~ 6. 9 8-2 - 19. 14 ~ - 28. 98 8-3 - 17. 138 ~ - 29. 78
2 343 Table 2 2 Statistical results of physical and mechanical properties of rock Rr /MPa G 50 /MPa μ 50 f ak /KPa 8-2 8-3 15 11 11 35. 1 20100 0. 39 13. 6 2120 0. 11 23. 53 8798. 2 0. 23 0. 289 0. 736 0. 447 20. 40 5218 0. 28 65 20 20 79. 6 35300 0. 3 33. 5 1410 0. 11 58. 56 20529 0. 17 0. 220 0. 500 0. 355 55. 83 16496. 5 0. 177 2500 10500 f αк = ψ ρ f rк ψ ρ 0. 18 f rк Table 3 /KPa 3 Cu Consolidation coefficient Cu statistics of silt soil under different vertical pressures 12. 5 ~ 25 25 ~ 50 50 ~ 100 100 ~ 200 200 ~ 400 400 ~ 800 1. 97 1. 33 1. 23 1. 14 1. 15 1. 46 7. 49 4. 5 3. 85 2. 81 4. 17 7. 34 0. 43 0. 22 0. 43 0. 36 0. 53 0. 58 0. 8767 0. 8391 0. 7213 0. 5993 0. 7366 1. 0625 18 18 18 18 18 10-3 cm 2 s - 1 2 - - 2. 1 1 2 60 3 4 5 ~ 25 cm > 30 cm - 0. 8 m 0. 5 m 25 m
344 29 2 000 kn 800 mm Ap f c ψ c = πr 2 14. 3 0. 6 = 3. 14 400 2 14. 3 0. 6 = 4 310. 6 kn Q Ap f c ψ c 3 0. 2% ~ 0. 65% C30 n π d /2 2 /A = 16 3. 14 16 / 10% ± 2 2 /3. 14 400 2 = 0. 64% n W6 W8 HPB235 Ⅰd A f y = 210 N /mm 2 HPB335 Ⅱ f y = 310 N / mm 2 2 2. 3 1 JGJ94-94 3 GB5007-2002 4 4 mm Φ 850 mm 5 6 2 m 2. 2 20 mm 1 2 6 7 8-11 2 Q = 2 000 kn Q Ap f c ψ c f c = 14. 3 N /mm 2 C30 5 ψ c = 0. 6 Ap 16 m 3 0. 5 m 0. 6 m Table 4 4 Technical requirements of percussive drilling 2 m 1 m 1. 2 ~ 1. 5 1 ~ 2 m 2 ~ 3 m 1. 2 ~ 1. 5 2 ~ 4 m 1. 3 1. 3 ~ 1. 5 Table 5 5 Mud performance of percussive drilling /kg m - 3 J S /mm 2 s /N m - 3 /% /% B /ml 30 min - 1 1. 00 ~ 1. 25 16 ~ 22 1. 0 ~ 2. 5 < 8 ~ 4 90-95 < 30 1. 20 ~ 1. 60 19 ~ 28 5. 0 ~ 7. 0 < 8 ~ 4 90-95 < 30
2 345 3 Φ 800 mm 2 1. 05 ~ 1. 20 kg /m 3 < 4% 20 s ~ 28 s > 95% 50 mm 4 219 mm 5 mm 30 min 2. 4 1 2-3 m 1 m 3 1# 2# 12 2 88# 191# 6 Table 6 6 Summary of test results /mm /m /kn /kn /mm /mm /mm 01# 88# 800 28. 55 2000 4000 12. 97 6. 49 4. 97 02# 191# 800 28. 30 2000 4000 13. 68 6. 98 6. 03 88# 191# Q 4 000 KN 4 1
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