地基承载力的双控确定方法

发布时间：2018-09-12 05:39

【摘要】：分析了目前规范确定承载力的方法,认为其不足之处是没有对应明确的安全系数和沉降变形值,实际应用中存在硬土或低压缩性地基的承载力偏保守,而软土或高压缩性地基以及大尺寸基础的承载力会因沉降变形过大而存在风险。建议地基的承载力应由岩土的强度参数和变形参数对具体的基础进行地基的强度和变形计算,按强度和变形双控的原则确定其最大地基承载力,可以获得地基承载力明确的安全系数和沉降值,获得更为科学合理的地基承载力,能更充分地利用地基的承载力进行地基设计,同时安全也更具有保障性,有较好的工程应用价值。建议现场压板载荷试验用于反算地基土的强度和变形参数,而不是用于直接确定承载力,现场压板试验没有进行到极限状态时建议用最大试验载荷值确定土的强度参数,土的变形参数则对试验曲线采用双曲线拟合确定。文中还建议了简易的双控确定方法,便于应用,通过案例对方法予以说明。
[Abstract]:This paper analyzes the method of determining bearing capacity of current code, and considers that its deficiency is that it has no definite safety factor and settlement deformation value, and the bearing capacity of hard soil or low compressibility foundation is conservative in practical application. However, the bearing capacity of soft soil or high compressibility foundation and large-sized foundation is at risk because of excessive settlement and deformation. It is suggested that the bearing capacity of the foundation should be calculated by the strength and deformation parameters of the rock and soil, and the maximum bearing capacity of the foundation should be determined according to the principle of double control of the strength and deformation. The safety factor and settlement value of foundation bearing capacity can be obtained, and more scientific and reasonable foundation bearing capacity can be obtained. It has good engineering application value. It is suggested that the in-situ compression plate load test should be used to inverse calculate the strength and deformation parameters of the foundation soil, not to determine the bearing capacity directly. When the in-situ compression plate test is not carried out to the limit state, it is suggested that the maximum test load value be used to determine the strength parameters of the soil. The deformation parameters of soil are determined by hyperbolic fitting. A simple method of double-control determination is suggested, which is easy to be applied and illustrated by a case study.
【作者单位】：广东省水利水电科学研究院;广东省岩土工程技术研究中心;华南理工大学土木与交通学院;
【分类号】：TU470

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