Experimental study on interface frictional property between sand and concrete pipe jacking
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摘要: 为了揭示不同工况下混凝土顶管-砂土接触面剪切摩擦特性，确定管土、管浆摩擦系数，为顶管施工参数的选取及顶进力的计算提供指导与参考。采用直剪试验研究了5种砂土在不同法向压力、不同剪切速率及不同润滑状态下与混凝土管接触面的摩擦特性。试验结果表明：随着砂土颗粒粒径的增加，砂土与混凝土接触面剪切应力稳定值降低。随着法向应力的增加，砂土界面剪切应力达到峰值或稳定值时的剪切位移增加，同时界面剪切应力-剪切位移曲线的应变软化特性逐渐减弱，应变硬化趋势逐渐增强。无润滑条件下，随着法向应力的增加，剪切应力稳定值增量基本保持稳定或略有降低，泥浆润滑条件下，剪切应力稳定值增量增大；在较低法向压力下剪切速率对砂土剪切应力的影响较小；泥浆润滑条件下，砂土与混凝土接触面剪切应力可降低70%~80%，随着法向应力的增加，润滑效果降低。Abstract: To reveal the shear friction mechanical mechanism between concrete pipe jacking and sand, obtain the friction coefficient of pipe-soil and pipe-slurry, and provide guidance and reference for the selection of pipe jacking construction parameters and the calculation of jacking force.To that end, the shear friction behavior and mechanical mechanism were investigated between 5 types of sands and concrete pipe under different normal pressure, shear rate and lubrication state. The test results show that the stable value (residual value) of shear stress at the concrete-sand interface increases first and then decreases with the increase of sand particle size. With the increase of normal stress, the shear displacement when the shear stress of the concrete-sand interface reaches the peak or stable value increases. Meanwhile, the strain softening characteristic of the shear stress versus shear displacement curve gradually weakens and the strain hardening trend gradually obvious. Without lubrication, as the normal stress increases, the increment of shear stress stability value remains stable or slightly decreases. With slurry lubrication, the increment of shear stress stability value increases. Under lower normal pressure, the shear rate has little effect on the shear stress of sand.When using slurry lubrication, the stable value of shear stress at the concrete-sand interface can be reduced by 70%-80%, and the lubrication effect decreases with the increase of normal stress.
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Key words:
- pipe-soil interface /
- frictional property /
- direct shear test /
- slurry lubrication
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图 3 不同粒径砂土接触面剪切应力-剪切位移曲线
Figure 3. Shear stress-displacement curves of interface under sand of different sizes
图 4 不同法向应力接触面剪切应力-剪切位移曲线
Figure 4. Shear stress-displacement curves of interface under different normal stresses
图 5 不同剪切速率砾砂接触面剪切应力-剪切位移曲线
Figure 5. Shear stress-displacement curves of gravelly sand interface under different shear rates
图 6 不同剪切速率粉砂接触面剪切应力-剪切位移曲线
Figure 6. Shear stress-displacement curves of siltys and interface under different shear rates
图 7 不同润滑状态砂土接触面剪切应力-剪切位移曲线
Figure 7. Shear stress-displacement curves of interface under different lubrication conditions
表 1 土样基本物理参数
Table 1. Basic physical parameters of soil samples
土样类型 粒度组成/% 最小干密度 最大干密度 控制干密度 饱和密度 > 2 mm [0.5, 2] mm (0.25, 0.5] mm (0.075, 0.25] mm ≤0.075 mm ρB/(g·cm-3) 砾砂 30 40 5 25 0 1.505 1.857 1.709 1.950 粗砂 5 50 5 40 0 1.628 1.875 1.717 1.949 中砂 5 35 15 45 0 1.647 1.844 1.698 1.954 细砂 5 25 0 70 0 1.609 1.855 1.663 1.965 粉砂 2 20 10 48 20 1.651 1.754 1.651 1.902 
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表 2 不同条件下接触面摩擦系数
Table 2. Friction coefficient of interface under different conditions
土样类型 不同法向应力下的摩擦系数 平均值 50 kPa 100 kPa 150 kPa 砾砂 干 0.600 0.570 0.587 0.586 饱和 0.561 0.557 0.558 0.559 泥浆润滑 0.137 0.143 0.218 0.166 粗砂 干 0.597 0.590 0.595 0.594 饱和 0.623 0.596 0.591 0.603 泥浆润滑 0.162 0.136 0.195 0.164 中砂 干 0.643 0.625 0.619 0.629 饱和 0.618 0.565 0.561 0.581 泥浆润滑 0.157 0.167 0.178 0.167 细砂 干 0.622 0.613 0.623 0.619 饱和 0.631 0.602 0.584 0.606 泥浆润滑 0.190 0.160 0.176 0.175 粉砂 干 0.646 0.612 0.603 0.620 饱和 0.621 0.600 0.588 0.603 泥浆润滑 0.207 0.189 0.224 0.207
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