Load bearing behavior of pile tip post-grouting super-long large-diameter bored piles in cohesionless soil
CHU Cheng-fu1, 2, LI Xiao-chun2, LU Li-hao3, XI Pei-sheng4
1. School of Resources & Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. Bozhou Hengda Highway Design Institute, Bozhou 230000, China; 4. School of Civil Engineering, Anhui University of Architecture, Hefei 230022, China
Abstract:According to the results of load tests on piles, the influence of pile tip post-grouting on the load bearing behavior of super-long large-diameter bored piles in cohesionless soil is analyzed. The test results show that the grouting cement can reach 16.0 m from the pile tip under the geological and construction conditions. The values of the ultimate bearing capacity, tip resistance and skin friction of the test piles after grouting are 1.59, 3.23 and 1.23 times those of bored piles without grouting. A conclusion is drawn that by using the tip post-grouting technique, it saves investment, improves construction quality and reliability, and brings considerable economic benefits and good socio-environment effects. Therefore it is instructive for the design and construction of similar piles.
储诚富, 李小春, 鹿立好, 席培胜. 无黏性土地区大直径超长钻孔灌注桩桩端压浆后的承载性能研究[J]. 岩土工程学报, 2011, 33(sup2): 388-391.
CHU Cheng-fu, LI Xiao-chun, LU Li-hao, XI Pei-sheng. Load bearing behavior of pile tip post-grouting super-long large-diameter bored piles in cohesionless soil. Chinese J. Geot. Eng., 2011, 33(sup2): 388-391.