【摘要】 针对重庆地区工程中泥岩的类型和特点,对3根嵌入中风化泥岩的模型桩进行了研究,着重从嵌岩深度角度出发,探讨了泥岩嵌岩桩的承载能力、轴力传递规律、桩侧摩阻力和桩端阻力分布的特性。结果表明:泥岩嵌岩桩在整个加载过程中呈现出端承摩擦桩的特点,其Q-S曲线呈缓变型;增加嵌岩深度能有效地提高基桩的承载力,减少桩顶沉降;嵌岩深度愈大,其轴力沿桩身从上至下逐渐递减的趋势愈明显;嵌岩段的桩侧摩阻力呈现"上大下小"的双峰分布模式,且随嵌岩深度的增加,靠近桩底的峰值有向下退化的趋向;增加嵌岩深度,能使嵌岩段桩侧摩阻力的发挥更加充分,但对桩端阻力的发挥影响不大;对于桩嵌入泥岩持力层时,建议最优嵌岩深度宜取5D,能够更好地发挥嵌岩桩的承载特性。更多还原

【Abstract】 Based on the types and characteristics of mudstone in Chongqing area,three model piles embedded in weathered mudstone are studied. The load capacity,axial force transmission law of mudstone rock-socketed piles,pile-side friction resistance and pile tip resistance distribution characteristics are discussed from the perspective of rock-socketed depth. The results show that the Q-S curve of the rock-socketed piles shows the characteristics of the end-bearing pile during the whole loading process,and the Q-S curve of the mudstone rock-socketed piles has a slow-changing type. Increasing the depth of the rock-socketed pile can effectively improve the bearing capacity of the pile and reduce the settlement of the pile. The greater the axial force along the pile from up to down is in the more gradual decline in the trend of the more obvious. Rock-embedded section of the pile side of the resistance shows"big and small"bimodal distribution model,and with the increase of rock depth,the pile bottom has the tendency to degrade downwards. The increase of the rock-socketed depth can make the pile-side friction resistance play more fully,but it has little effect on the pile-end resistance. For the pile embedded in the mudstone bearing layer,it is suggested that the optimum rock-socketed depth is 5D,which can better play the bearing characteristics of rock-socketed piles.更多还原