重交通荷载作用下港区地基工作区深度研究

发布时间：2018-06-26 09:37

本文选题：隧道工程 + 重交通荷载　；参考：《岩石力学与工程学报》2014年S1期

【摘要】：基于重交通荷载作用下港口地基工作区深度现场试验,采用有限差分软件FLAC3D建立重交通荷载作用下港口地基的数值模型。通过现场试验监测结果验证了数值模型的合理性,并对重交通荷载作用下港区地基工作机制进行深入研究。最后,针对港区地基设计计算中砂垫层厚度、接地面积和轮压等重要参数进行系统分析。研究结果表明:重交通荷载作用下,港区地基附加应力与自重应力比等于0.2和0.1的深度分别约为1.63和2.03 m;竖向应变在淤泥质黏土层顶部最大;侧向位移沿深度和水平方向呈先增大后减小;随着砂垫层厚度的增加,地基中的最大竖向应变和最大侧向位移逐渐减小,当砂垫层厚度为1.25 m时,地基工作区深度恰好位于砂垫层底部;随着接地面积和轮压的增大,地基工作区深度和地基中的最大竖向应变和最大侧向位移均逐渐增大。
[Abstract]:Based on the field test of the depth of the port foundation working area under heavy traffic load, the numerical model of the port foundation under heavy traffic load is established by using the finite difference software FLAC3D. The rationality of the numerical model is verified by the monitoring results of field tests, and the working mechanism of the foundation in the port area under heavy traffic loads is studied in depth. Finally, some important parameters, such as thickness of sand cushion, ground area and wheel pressure, are analyzed systematically. The results show that under heavy traffic load, the depth of the ratio of additional stress to deadweight stress is about 1.63 and 2.03 m.The vertical strain is the largest at the top of silt clay layer. The lateral displacement increases first and then decreases along the depth and horizontal direction, and the maximum vertical strain and the maximum lateral displacement decrease with the increase of the thickness of the sand cushion, when the thickness of the sand cushion is 1.25 m, The depth of the working area is exactly at the bottom of the sand cushion, and with the increase of ground area and wheel pressure, the depth of the working area and the maximum vertical strain and the maximum lateral displacement in the foundation increase gradually.
【作者单位】：山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室;华中科技大学土木工程与力学学院;中交第四航务工程勘察设计院有限公司;
【基金】：国家自然科学基金资助项目(51278216) 交通运输部水运工程建设项目山西省交通建设科技项目(11 2 05)
【分类号】：U655.54

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