CAJ | 학술논문

湿陷性黄土模型试验相似材料一直是地质力学模型试验相似材料研制的瓶颈，限制了湿陷性黄土地区模型试验的开展。本文基于Monte Carlo方法，采用空中自由下落技术，研制出了能够模拟湿陷性黄土的模型试验相似材料。在研制出湿陷性黄土相似材料的基础上，进行单桩负摩阻力模型试验，探讨在湿陷性黄土地区广泛存在于桩基工程中的负摩阻力。研究结果表明：桩身轴力沿桩身大致呈“B”形态分布，中性点位于湿陷性土层与砂层的交界处。在自重湿陷作用下，桩顶的沉降远小于土体的湿陷变形，桩侧负摩阻力沿深度增大，在中性点处达到峰值。在浸水1h内，摩阻力随时间大致呈“D”形态分布。在整个测试阶段，负摩阻力出现了第二次峰值，曲线分布呈“β”形态。由于负摩阻力的作用，使桩顶产生0.54mm的沉降变形。本文的研究方法和成果可为分析湿陷性黄土地区桩基的受力特性提供参考。
습함성황토모형시험상사재료일직시지질역학모형시험상사재료연제적병경，한제료습함성황토지구모형시험적개전。본문기우Monte Carlo방법，채용공중자유하락기술，연제출료능구모의습함성황토적모형시험상사재료。재연제출습함성황토상사재료적기출상，진행단장부마조력모형시험，탐토재습함성황토지구엄범존재우장기공정중적부마조력。연구결과표명：장신축력연장신대치정“B”형태분포，중성점위우습함성토층여사층적교계처。재자중습함작용하，장정적침강원소우토체적습함변형，장측부마조력연심도증대，재중성점처체도봉치。재침수1h내，마조력수시간대치정“D”형태분포。재정개측시계단，부마조력출현료제이차봉치，곡선분포정“β”형태。유우부마조력적작용，사장정산생0.54mm적침강변형。본문적연구방법화성과가위분석습함성황토지구장기적수력특성제공삼고。
The model test material of collapsible loess is the bottleneck of similar material model research in geo-mechanics,which has limited application of model tests in loess area.A similar material of model test for collapsible loess is developed by airfall technique based on Monte Carlo method.A single pile foundation model test is carried out to investigate the negative skin friction of the pile under the effect of self-weight collapsibility.The research re-sults show that the axial force along the pile of different time roughly appeared as the shape of“B”.The neutral point is located between the modeled collapsible soil and sands.The settlement of the top of pile is far less than col-lapse deformation of the soil due to the effect of self-weight collapsibility.The negative frictional resistance of the pile increases along the depth and reaches the peak at the neutral point.The frictional resistance along the pile roughly appears as the shape of“D”when immersing water for 1 hour.Through out the testing phase,the negative friction reaches a second peak and the curve distributes as the shape of“β”.The settlement of the top of pile is a-bout 0.54mm due to the frictional resistance.The experimental research methods and results can provide references for similar projects.