Prediction of strength of silty clay-concrete interface under cyclic loading
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摘要: 基于3D扫描和打印技术，制作了与混凝土灌注桩相同的界面混凝土试件，并进行了一系列粉质黏土-混凝土界面循环剪切试验。通过粉质黏土-混凝土界面循环剪切试验，揭示不同循环周期、循环幅值条件下界面强度的衰减规律。通过对循环幅值和法向压力幂函数拟合，对循环稳定后-土界面强度衰减系数进行表征，并结合黏土-混凝土界面峰值强度模型，提出粉质黏土-混凝土界面强度衰减模型。结果表明：在15次循环后，部分循环的剪切位移-剪切应力曲线近似重合；当循环幅值逐渐增大，剪切阶段与卸载阶段应力-应变曲线均呈现线性趋势，每个循环圈内加载与卸载的斜率基本保持一致，类似“平行四边形”；不同工况的循环稳定后界面剪切峰值强度折减系数Dτ存在相同的变化趋势，可通过循环幅值A和法向应力σ的无量纲非线性回归分析，提出循环稳定后黏土-混凝土界面剪切峰值强度折减系数Dτ表征方法，其拟合度较高。Abstract: Based on the 3D scanning and printing technology, the concrete specimens with the same contact surface as the concrete cast-in-place piles are produced, and a series of silty clay-concrete interface cyclic shear tests are conducted. Through the cyclic shear tests on the silty clay-concrete interface, the attenuation laws of interface strength under different cyclic periods and cyclic amplitudes are revealed. By fitting the cyclic amplitude and normal pressure power function, the strength attenuation coefficient of the concrete-soil interface after cyclic stabilization is characterized, and by combining with the peak strength model for the clay-concrete interface, the strength attenuation model for the silty clay-concrete interface is proposed. The results show that the shear displacement-shear stress curves of some cycles coincide approximately after 15 cycles. When the cyclic amplitude increases gradually, the stress-strain curves at the shear stage and unloading stage show a linear trend, and the slopes of loading and unloading in each cycle are basically consistent, similar to "parallelogram". The reduction coefficient Dτ of the peak interfacial shear strength after cyclic stabilization has the same variation trend under different working conditions. A dimensionless nonlinear regression analysis of cyclic amplitude A and normal stress σ can be used to obtain the reduction coefficient Dτ of the peak interfacial shear strength after cyclic stabilization, which has a high degree of fitting.
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Keywords:
- interfacial shear /
- interface strength /
- roughness /
- residual strength /
- prediction of peak strength
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图 3 循环剪切滞回曲线
Figure 3. Curves of shear displacemetn and shear stress under different cyclic amplitudes
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图 4 不同循环幅值下循环圈弱化系数与循环次数关系
Figure 4. Relationship between weakening coefficient and number of cycles under different cycle amplitudes
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图 6 黏土-混凝土界面强度预测值与实测值对比
Figure 6. Comparison between predicted and measured strengths of clay-concrete interface
表 1 粉质黏土物理力学性质
Table 1 Basic physical and mechanical properties of silty clay
物理力学性能指标 数值 干重度/(kN·m-3) 15.8 含水率/% 32 最优含水率/% 13 液限/% 37 塑限/% 20 孔隙比 0.82 黏聚力/kPa 44.3 内摩擦角/(°) 15.9 
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