嵌岩桩水平承载力地基反力Matlock法分析

嵌岩桩在海上风电、跨海大桥等结构中的应用十分广泛，但在嵌岩桩水平承载特性方面的研究仍有较多不足。弹性地基反力法中的m法在我国是用于计算水平承载桩承载力时应用最多的方法，但地基反力m法针对嵌岩桩缺少合理的取值方法。本文基于现场试验数据建立并验证有限差分数值模型，通过数值模拟与参数分析，研究了岩体力学参数和桩基参数等因素对桩岩相互作用的影响，提出了m法中地基反力系数比例系数的拟合计算公式。通过现场试验数据对文中提出的方法进行了验证，计算结果与实际情况较为相符，通过与其它方法比较，本文提出的修正m法相对非线性的p-y曲线法具有取值计算较为简便的优势。

Subgrade reaction m-method for lateral bearing capacity of rock-socketed pile

Rock-socketed piles are commonly used in many structures such as offshore wind turbines and bridges, but the research about the lateral bearing characteristics of pile embedded in rock remains inadequate. Subgrade reaction m-method is popular method to determine the lateral bearing capacity of piles. But the reasonable calculation method to determine the parameters of subgrade reaction method for weathered rock mass is still unavailable. The numerical models of rock socketed piles are constructed based on finite difference method and are verified by comparing with the in-situ test results. Numerical parametric analyses are carried out with the numerical model by taking account various factors that influence the rock-pile interaction such as mechanics parameters of rock and pile. A calculation formula is proposed to determine the proportional coefficient of the subgrade modulus in the m method. The method proposed in this paper is verified by full-scale lateral load tests of rock-socketed piles, and the computed pile responses are compared with the other method in the literature and are in good agreement with the experimental data. The proposed method is more convenient compared with the nonlinear p-y methods to determine the parameter and calculate the respond of piles.