【摘要】 超声振动钻进技术作为一种新兴的岩土钻探手段，具有效率高、适应性强、成本低等优点。为探究超声振动对软土的作用机理，设计了一系列的拖球试验，开展了含水率、作用距离、围压和含砂量等因素对超声振动作用下软土的流动特性影响的试验研究。研究结果表明，超声振动对软土流动性的振动效果随距离的不同而产生较大差异，作用距离越短，振动效果越大；在作用距离相同的情况下，含水率越高，超声振动对软土的流动特性的促进作用越明显；围压会抑制超声振动对软土流动性的作用效果；向软土中掺砂可以从整体上抑制超声振动下软土的流动特性，增强土体的固体性质。更多还原

【Abstract】 Ultrasonic vibration drilling technology, as an emerging geotechnical drilling method, has the advantages of high efficiency, strong adaptability, and low cost.In order to explore the mechanism of ultrasonic vibration on soft soil, a series of towing ball tests were designed to study the influence of water content, action distance, confining pressure and sand content on the flow characteristics of soft soil under ultrasonic vibration.The results show that the vibration effect of ultrasonic vibration on the fluidity of soft soil varies greatly with the distance.The shorter the distance, the greater the vibration effect.Under the same action distance, the higher the water content, the more obvious the effect of ultrasonic vibration on the flow characteristics of soft soil.The confining pressure will inhibit the effect of ultrasonic vibration on the fluidity of soft soil.Adding sand to soft soil can inhibit the flow characteristics of soft soil under ultrasonic vibration and enhance the solid properties of soil.更多还原