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1、 24 14 Vol.24 No.14 2005 7 Chinese Journal of Rock Mechanics and Engineering July 2005 2004 03 29 2004 05 18 (1976 ) 1999 E-mail PHP 1 2 2 2(1. 210098 2. 226009) PHP(partially hydrolyzed polyacrylamide) PHP 1 mm 0 cm PHP TU 473.1 + 4 U 443.15 + 4 A 1000 6915(2005)14 2571 05 APPLICATION OF PHP SLURR
2、Y TO DRILLING OF OVERLENGTH AND EXTRA-LARGE-DIAMETER BORED PILES ZHANG Xiong-wen 1 2 GUAN Yi-jun 2 ZHOU Jian-hua 2 (1. College of Civil Engineering Hohai University Nanjing 210098 China 2. Jiangsu Provincial Su-Tong Bridge Construction Headquarters Nantong 226009 China) Abstract PHP (partially hydro
3、lyzed polyacrylamide) slurry is especially suitable for the drilling of overlength and extra-large-diameter bored piles. Its economical efficiency and construction efficiency are dependent on the following key factors manufacturing of raw materials manufacturing process cycling system and constructi
4、on control. According to geological and hydrologic conditions of the site of Su-Tong Bridge the testing pile project has adopted PHP slurry cycling system which has been proved in the practice to have achieved thickness of mud cake around piles less than 1 mm and thickness of sediments at pile tip o
5、f zero. Key words bridge engineering PHP(partially hydrolyzed polyacrylamide) slurry Su-Tong Bridge bored pile mud cake sediment at pile tip 1 2572 2005 1 2 PHP 20 60 4 PHP(partially hydrolyzed polyacrylamide) 20 70 80 2PHP PHP 3 (1) PHP PHP (2) (0% 0.3%) ( PHP ) ( 1.02 1.04) 4% (3) PHP (4) PHP 1 mm (5) (6) PHP (7) PHP 4 5 60% (8) PHP pH = 8 3 PHP 3.1 PHP
