泥岩地区大直径嵌岩桩承载特性研究

来源 :第八届全国青年岩土力学与工程会议暨青年华人岩土工程论坛 | 被引量 : 0次 | 上传用户:cs_200901
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基于自平衡桩基测试技术,本文对南京金润国际广场的六根钻孔灌注桩进行了静荷载实验,并对泥岩地区大直径嵌岩桩的承载特性进行了研究,包括承载力和变形、桩侧摩阻力、桩端阻力等.试验表明,桩端阻力所占承载力比例约为33%~38%,以摩擦力为主,软岩嵌岩桩可视为端承摩擦桩;试桩嵌岩比为9.7~14.4,嵌岩段阻力占总承载力的70%~75%,且嵌岩段侧摩阻力与桩端阻力的贡献相当,一定的人岩深度是获取较高承载力的保证.实测得到的泥岩侧阻与端阻皆大于勘查报告值,端阻力的差距尤为突出.受勘察条件和能力的限制,对于软岩嵌岩桩,按勘察报告提供的岩石侧阻和端阻力估算承载力和按岩石单轴饱和抗压强度估算承载力两种方法皆会严重低估嵌岩部分承载力.
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