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NUMERICAL SIMULATION OF THE RELATIONSHIP OF BEARING CAPACITY OF POST-GROUTING BORED PILE AND GROUTING PARAMETERS
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摘要: 运用有限元分析软件模拟分析了某实际工程钻孔桩在注浆前后的承载性能，计算值和实测值吻合较好。引入注浆加固体半径和注浆体强度来模拟后注浆对钻孔桩承载力的影响，并指出注浆量的大小对承载力的影响较大，基本上随着加固体半径的增加线性增加，而注浆体强度的影响存在临界值，超过该值后，强度增加的影响甚微。Abstract: The numerical simulations of bearing capacity of bored piles before and after grouting of a project by FEM are presented. The calculation results are better fit to the measurement results. The effects of post-grouting on bearing capacity are simulated introducing the radius and strength of grouted soil body. The results show the effect of grouting volume on the bearing capacity is large and the bearing capacity of bored piles is linearly increased with the increase of the radius of the grouted soil body. The effect of the strength of grouted soil on the bearing capacity is limited and the critical strength value of grouted soil exists, the effect of the increase of strength on the bearing capacity is very slight after the strength is over the critical value.
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Key words:
- post-grouting of pile end /
- bored pile /
- bearing capacity /
- numerical simulation /
- effect factors
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Dan Brown. Effect of Construction on Axial Capacity of Drilled Foundations in Piedmont Soils. Journal of Geotechnical and Geoenvironment Engineering. 2002,128(12):967～973; [2] Ming-Fang Chang,Hong Zhu. Construction Effect on Load Transfer along Bored Pile. Journal of Geotechnical and Geoenvironment Engineering, 2004, 130(4):426～437; [3] O'Neill M W. Side Resistance in Piles and Drilled Shafts. Journal of Geotechnical and Geoenvironmental Engineering,2001, 127 (1): 3～16; [4] 楼晓明,陈强华,俞有炜,等.钻孔灌注桩承载力异常现象分析.岩土工程学报,2001,23(5):547～551; [5] 张忠苗,辛公锋.不同持力层钻孔桩桩底后压浆应用效果分析.建筑结构学报,2002,23(6):85～94; [6] 黄敏,张克绪,张尔齐.嵌入砂或砂砾层中的桩底灌浆桩竖向承载性能研究.土木工程学报,2002,35(3):77～81 -
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