The application of trenchless technology is the trend of underground public facilities’ installation, replacement and repairing. As the soil-engaging component during penetrating bore, the working resistance of penetration head has remarkable effect on energy consumption of the whole working process. Some typical soil-digging animals, like pangolin and earthworm, they own special micro structures on their surface. It has been widely proved that some micro geometrical structures can effectively reduce adhesion resistance. Four kinds of bionic penetration heads were designed by imitating micro geometrical structures inspired by the soil animals. In this work, the real time jacking forces of the bionic penetration heads were measured and compared with a smooth penetration head (control group) without micro geometrical structures. The result indicated that the jacking forces of the bionic penetration heads were smaller than that of the smooth penetration head. This proved that the bionic penetration heads have the ability of reducing adhesion resistance. The vertical concave penetration head got the smallest jacking force, of which the average jacking force was 18.7% lower than that of the smooth penetration head. The interaction between soil and bionic surface of penetration head was discussed on the condition of wet friction. The bionic surface reduced the adhesion resistance by disturbing the soil and braking the continuous water film between soil and the surface of the penetration head.

中文翻译：

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仿生设计可减少黏土中无沟渠装置的顶力

非开挖技术的应用是地下公共设施安装，更换和维修的趋势。渗透头的工作阻力作为渗透孔内的固结成分，对整个工作过程的能耗有显着影响。一些典型的挖土动物，例如穿山甲和worm，它们的表面具有特殊的微结构。业已广泛证明，某些微观几何结构可以有效降低抗粘附性。通过模仿土壤动物的启发，设计了四种仿生穿透头。在这项工作中，测量了仿生穿透头的实时顶升力，并将其与没有微观几何结构的光滑穿透头（对照组）进行了比较。结果表明，仿生穿透头的顶升力小于光滑穿透头的顶升力。这证明了仿生穿透头具有降低粘附阻力的能力。垂直凹入式钻头的顶升力最小，平均顶升力比平头的低。讨论了湿摩擦条件下土壤与渗透头仿生表面的相互作用。仿生表面通过扰动土壤并制动土壤和渗透头表面之间的连续水膜而降低了附着力。这证明了仿生穿透头具有降低粘附阻力的能力。垂直凹入式钻头的顶升力最小，平均顶升力比平头的低。讨论了湿摩擦条件下土壤与渗透头仿生表面的相互作用。仿生表面通过扰动土壤并制动土壤和渗透头表面之间的连续水膜而降低了附着力。这证明了仿生穿透头具有降低粘附阻力的能力。垂直凹入式钻头的顶升力最小，平均顶升力比平头的低。讨论了湿摩擦条件下土壤与渗透头仿生表面的相互作用。仿生表面通过扰动土壤并制动土壤和渗透头表面之间的连续水膜而降低了附着力。