冯冠军,童大贵,阿发友

• 1:昆明理工大学国土资源工程学院
• 2:自然资源部高原山地地质灾害预报预警与生态保护修复重点实验室
• 3:云南省高原山地地质灾害预报预警与生态保护修复重点实验室

摘要(Abstract)：

【目的】山洪沟中砂卵石复合地层广泛分布，在山洪冲击力和局部冲刷联合作用下，倾斜群桩承载性能演化机理尚不明确。为探究复杂地层条件对群桩承载性能的影响，对2×2倾斜群桩在不同工况下进行有限元模拟，得出了倾斜群桩受不同荷载的承载力变化曲线。【方法】考虑土体沿深度方向的不均匀性，采用Gibson土体模型，建立了考虑山洪冲击力、局部冲刷和桩土非线性接触的有限元数值分析模型，并采用现场试验数据验证了模型合理性。【结果】研究发现，在一定范围内增大基桩倾角可以减小群桩沉降量，提高群桩竖向承载力；当基桩倾角过大时，基桩进入下部卵石层深度显著减小，群桩沉降量增大，竖向承载力降低；砂卵石复合地层中下部卵石地层粒径大硬度高，在基桩倾角增大时群桩沉降增幅不明显；基桩倾角的增大可以有效提高群桩水平承载力；冲刷坑形成后，群桩沉降和水平位移明显增大，将导致群桩承载性能降低。【结论】结果表明：在下部为砂卵石层的复合地层条件下，倾斜群桩的承载能力并不完全是随着倾角增大而增大；随着倾角的增加，群桩对山洪冲击力的承载能力有明显增大。因此对于复合地层下的倾斜群桩需根据实际情况合理选择倾斜角度，使倾斜群桩在面对竖向荷载和山洪冲击时有良好的承载性能。

关键词(KeyWords)： 砂卵石复合地层;倾斜群桩;承载性能;山洪冲击力;局部冲刷;沉降;水平位移;影响因素

Abstract:

Keywords:

基金项目(Foundation): 云南省基础研究专项面上项目(202301AT070396);; 昆明理工大学自然科学研究基金(KKZ3202421107);; 国家自然科学基金地区科学基金项目(42267020)

作者(Author): 冯冠军,童大贵,阿发友

DOI: 10.13928/j.cnki.wrahe.2026.03.013

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