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针对重庆地区侏罗系沙溪庙组中风化砂岩和泥岩的特性,在室内开展两种基岩类型的模型试验,着重从嵌岩深度和基岩特性两方面探讨大直径嵌岩桩的承载能力、轴力传递规律、桩侧摩阻力和桩端阻力的发挥特性。试验结果表明:4根模型桩的沉降随荷载的增大均呈缓变型增长,在相同嵌岩比下,提高桩周岩层的强度,可提高嵌岩桩的承载能力,更充分地发挥桩侧摩阻力,但桩端阻力的发挥会受到影响;试桩的桩侧摩阻力占桩顶荷载的80%以上,均属端承摩擦桩,其分布呈“上大下小”双峰模式,且随嵌岩比的增大,靠近桩底的峰值有向下退化的趋向。
In view of the characteristics of the weathered sandstone and mudstone in the Shaximiao Formation in Chongqing area, two types of bedrock model tests were carried out indoors, focusing on the bearing capacity of large diameter rock-socketed piles in terms of socketed depth and bedrock characteristics , The law of axial force transmission, the frictional resistance of pile and the resistance of pile tip. The experimental results show that the settlement of four model piles increases slowly with the increase of load. Under the same ratio of rock-socketed rock, the strength of the rock piles around the piles increases the bearing capacity of rock-socketed piles, But the pile end resistance exerts its influence. The pile side friction resistance of the test pile accounts for more than 80% of the top load of the pile, which belongs to the end bearing friction pile. The distribution of the pile top resistance is bimodal mode , And with the increase of rock-in-rock ratio, the peak near the bottom of the pile tends to degenerate downward.