Centrifugal model tests and numerical simulations of pile-net composite foundation for heavy-load storage yard
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摘要: 以某码头重载堆场CFG桩网复合地基为研究背景,开展离心模型试验及三维数值模拟计算,研究重载作用下桩网复合地基变形及受力特性。结果表明:离心模型及数值模拟得出的地基变形、桩顶轴力、孔隙水压力及桩土应力比结果具有较好的一致性,两种方法可互为补充验证;重载作用下,桩网复合地基发生的位移以竖向沉降分量为主,水平位移分量较小,位移变化速率满足堆场稳定性控制要求;复合地基中桩土应力比介于20~40之间,CFG桩分担了一半以上的上覆堆场荷载,发挥了极其关键的荷载分担作用。Abstract: Based on the research background of pile-net composite foundation of the heavy-load storage yard of a wharf, the centrifugal model tests and three-dimensional numerical simulations are carried out to study the deformation and stress characteristics of the pile-net composite foundation under heavy loads. The results show that the values of foundation deformation, axial force at pile top, pore water pressure and pile-soil stress ratio obtained by the centrifugal model and numerical simulation are in good agreement, and the two methods can be complemented and verified for each other. Under the heavy loads, the displacement of the pile-net composite foundation is mainly the vertical settlement component, and the horizontal displacement component is small. The change rate of displacement meets the control requirements of yard stability.The pile-soil stress ratio in the composite foundation is between 20 and 40, and the CFG piles share more than half of the loads of the overlying storage yard, playing a key role in load sharing.
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Keywords:
- CFG pile /
- deformation /
- pile-soil stress ratio /
- centrifugal model test /
- numerical simulation
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表 1 土的计算参数
Table 1 Parameters of soils
土层参数 K n Rf c/kPa φc/(°) Kur/K cd nd Rd CFG桩 复合垫层 400.0 0.300 0.70 25.0 0.0 3.5 0.005 0.67 0.69 γ=24 kN/m3,
E=30 GPa, =0.2素填土①2 186.2 0.794 0.70 25.1 18.7 4.0 0.010 0.60 0.69 淤泥质黏土②1 87.6 0.832 0.80 9.9 12.2 5.0 0.040 0.80 0.69 粉质黏土③4 250.0 0.700 0.70 27.2 17.7 4.0 0.005 0.58 0.69 土工格栅 中粗砂③2 250.0 0.700 0.70 0.0 30.0 4.0 0.005 0.58 0.69 J2%=210 kN/m, E=2 GPa, =0.3 黏土④1 110.0 0.809 0.75 32.6 14.8 8.0 0.025 0.75 0.69 黏土④2 136.2 0.794 0.70 32.6 14.8 8.0 0.020 0.75 0.69 -
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