路堤堆载下深厚淤泥变形特征及演化规律  

Deformation Characteristics and Evolution Law of Deep Silt Deposition under Embankment Loading

作　　者：孟园英 谭鑫[2] 周嘉威 刘晓明[2] 刘涛 MENG Yuan-ying;TAN Xin;ZHOU Jia-wei;LIU Xiao-ming;Liu Tao(Guangzhou Expressway Co.Ltd.,Guangzhou 510335,China;College of Civil Engineering,Hunan University,Changsha 410082,China;CCCC Highway Consultants Co.Ltd.,Beijing 100010,China)

机构地区：[1]广州市高速公路有限公司,广州市510335 [2]湖南大学土木工程学院,长沙市410082 [3]中交公路规划设计院有限公司,北京市100010

出　　处：《公路》2024年第5期84-95,共12页Highway

基　　金：国家自然科学基金项目,项目编号52278348。

摘　　要：深厚淤泥沉积区域的地表堆载会导致地层产生侧向变形,可能对堆载邻近基础设施产生不利影响。以广东省南中高速公路深厚淤泥地层条件为背景,开展了大型现场原位堆载试验,获得了淤泥地层在堆载作用下的深部侧向变形曲线。结合室内试验及原位测试结果,建立了反映原位力学特征的地层数值模型,并利用原位堆载试验实测结果验证了数值模型的合理性。在此基础上采用数值模拟方法详细分析了深厚淤泥地层在堆载作用下的变形以及附加应力分布模式,分析结果揭示地层侧向位移主要是由于软弱土体进入塑性屈服状态并产生持续侧向流动导致,因此在数值模型中建立能够反映原位地层抗剪强度参数与埋深关系的参数分布模式非常重要。通过参数分析研究了地层组合以及堆载大小对地层侧向位移的影响规律,以期为深厚淤泥地区评估堆载填筑工程相关影响提供借鉴经验。Surcharge loading in deep silt deposition areas can cause lateral deformation of the ground,which may cause adverse effects on the adjacent infrastructure.Taking the deep silt deposition conditions of the Nanshan-Zhongshan Expressway in Guangdong Province as the background,a large-scale in-situ loading test is carried out and the lateral deformation curves of the silt deposition under loading are obtained.Combining the results of laboratory experiments and in situ tests,the numerical model is established to reflect the natural in situ mechanical characteristics of the ground,and the rationality of the numerical model has been verified by the monitoring results from in-situ loading tests.Numerical simulation methods are used to analyze the deformation and additional stress distribution of the deep silt deposition under surcharge loading,and the numerical results reveal that the lateral deformation of the ground is mainly caused by the extremely weak soil entering the plastic yielding and causing sustained lateral flow.Therefore,it is very important to establish a parameter distribution mode in the numerical model that can reflect the relationship between the in-situ strength properties of the ground and the burial depth.Through parameter analysis,the influences of the deposition thickness and the overload on lateral deformation of the ground are studied,in order to provide reference experience for evaluating the impact of surcharge loading projects in deep silt deposition areas.

关 键 词：路基工程 淤泥 堆载 侧向变形 现场试验 数值模拟 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU472[建筑科学—结构工程]