Analysis on construction application of lager diameter pile foundation engineering in Guangdong coastal areas

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1 GLOBAL GEOLOGY Vol. 29 No. 2 Jun # 2# TU473 A doi /j. issn 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 China 2. Electronic Science and Engineering College Jilin University Changchun China 3. Tonghua Design Institute of Water Conservancy and Hydroelectric Power Tonghua Jilin China 4. China Municipal Engineering Northeastern Design Institute Changchun China 5. Science and Technology Park Jilin University Changchun China 6. Logistics Group Jilin University Changchun 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

2 # 2# Rr 1 f ak # 2# Cu 3 Table 1 1 Formation conditions of construction site /m % ~ 30% 5 ~ 25 cm > ~ ~ % 1. 5 ~ ~ ~ ~ % ~ 30% % ~ 38% 1. 3 ~ ~ ~ ~

3 2 343 Table 2 2 Statistical results of physical and mechanical properties of rock Rr /MPa G 50 /MPa μ 50 f ak /KPa f αк = ψ ρ f rк ψ ρ f rк Table 3 /KPa 3 Cu Consolidation coefficient Cu statistics of silt soil under different vertical pressures ~ ~ ~ ~ ~ ~ cm 2 s ~ 25 cm > 30 cm m 0. 5 m 25 m

4 kn 800 mm Ap f c ψ c = πr = = kn Q Ap f c ψ c % ~ 0. 65% C30 n π d /2 2 /A = / 10% ± 2 2 / = 0. 64% n W6 W8 HPB235 Ⅰd A f y = 210 N /mm 2 HPB335 Ⅱ f y = 310 N / mm JGJ GB mm Φ 850 mm m mm Q = kn Q Ap f c ψ c f c = N /mm 2 C30 5 ψ c = 0. 6 Ap 16 m m 0. 6 m Table 4 4 Technical requirements of percussive drilling 2 m 1 m 1. 2 ~ ~ 2 m 2 ~ 3 m 1. 2 ~ ~ 4 m ~ 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 ~ ~ ~ 2. 5 < 8 ~ < ~ ~ ~ 7. 0 < 8 ~ < 30

5 Φ 800 mm ~ kg /m 3 < 4% 20 s ~ 28 s > 95% 50 mm mm 5 mm 30 min m 1 m 3 1# 2# # 191# 6 Table 6 6 Summary of test results /mm /m /kn /kn /mm /mm /mm 01# 88# # 191# # 191# Q KN 4 1

6 Ministry of Construction. GB Code for acceptance of construction quality of building foundation 800 mm S. Beijing China Architecture Building Press M YAN Tai-ning SUN You-hong SHI Yong-quan. Drilling & tunneling engineering M. Beijing China University of Geosciences Press M LIU Guang-zhi. Special drilling technology M. Beijing China University of Geosciences Press M LI Shi-zhong. Drilling technology M. Beijing Geological Publishing House M. 1. M. Beijing Geological Publishing House D LI Wen-juan. The nonlinear finite element analysis of bearing under the weak layer of large diameter pile foundation under the weak layer master's degree thesis D Guangzhou South China University of Technology GB J. S Ministry of Chemical Industry. GB Code for anticorrosion design of industrial construction S. Beijing China Architecture Building Press JGJ94-94 S Ministry of Construction. JGJ94-94 Technical code for building pile foundations S. Beijing China Plans Press Wuhan Institute of Geology. Drilling technology Ⅰ 10. M Wuhan Institute of Geology. Drilling technology Ⅱ M. Beijing Geological Publishing House CHANG Yu-jun YIN Kun. Impact study rotary mechanism of broken rock J. Exploration Engineering # 2# R Zhuhai Traffic Engineering Quality Supervision and Tes- 4. GB ting. The test report of the vertical single pile of compres- S sion static load test of 1# 2# unit desulphurize engineering technology building of Zhuhai power R. Guang- Ministry of Construction. GB Code for design of building foundation S. Beijing China Architecture zhou Electric Power Design Institute of Guangdong Province GB Building Press S

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