下卧软弱夹层地基ALE法强夯加固数值分析  

Numerical simulation for dynamic compaction reinforcement of underlying soft interlayer foundation with ALE method

作　　者：李岳[1] 彭梦凯 蔡靖[1,2] 刘文俊 水伟厚 董炳寅 LI Yue;PENG Mengkai;CAI Jing;LIU Wenjun;SHUI Weihou;DONG Bingyin(School of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Civil Aviation Airport Intelligent Construction and Industrialization Engineering Technology Research Center,Tianjin 300456,China;School of Transportation,Southeast University,Nanjing 211189,China;Beijing Dadi Geotechnical Engineering Co.,Ltd.,Beijing 100176,China;Guangdong Dadi Geotechnical Engineering Co.,Ltd.,Guangzhou 510700,China)

机构地区：[1]中国民航大学交通科学与工程学院,天津300300 [2]民航机场智能建造与工业化工程技术研究中心,天津300456 [3]东南大学交通学院,南京211189 [4]大地巨人(北京)工程科技有限公司,北京100176 [5]大地巨人(广东)岩土工程有限公司,广州510700

出　　处：《振动与冲击》2024年第15期142-149,199,共9页Journal of Vibration and Shock

基　　金：中央高校基金项目(3122022043);高能级强夯置换加固深软杂填路基关键技术研究(329919234);民航机场智能建造与工业化工程技术研究中心开放课题(MHJGKFKT-04)。

摘　　要：随着高能级强夯快速发展,软弱夹层对地基加固影响问题凸显,其吸能缓冲作用机理尚不清晰,夯击参数选取经验性强。基于现场试验和任意拉格朗日-欧拉(arbitrary Lagrange-Euler, ALE)法强夯加固仿真开展地基应力波传播过程研究,探讨下卧软弱夹层对加固效果影响机理。对夯击能级、夹层埋深、夹层厚度等因素进行参数研究,改进强夯参数设计流程。结果表明:软弱夹层对夯击应力波向下传播过程有迟滞作用,地基应力场在此深度内发生断层;当首击地基加固深度为1/2软弱夹层埋深时,可兼顾能级控制与施工效率需要;当软弱夹层埋深大于10 m或厚度超过2 m时加固难度较大,需配合其他工法共同加固处理。With rapid development of high-energy level dynamic compaction,effects of soft interlayer on foundation reinforcement become increasingly prominent.The mechanism of its energy absorption and buffering action is not yet clear,and the selection of ramming parameters is highly empirical.Here,based on on-site tests and ALE method,dynamic compaction reinforcement simulation was performed to study propagation process of foundation stress waves,and explore the mechanism of influences of underlying soft interlayer on the reinforcement effect.Parametric study was performed for factors of ramming energy level,interlayer burial depth and interlayer thickness to improve the design process of dynamic compaction parameters.The results showed that soft interlayer has a hysteresis effect on downward propagation process of ramming stress waves,and foundation stress field has faults within this depth;when the first strike foundation reinforcement depth is 1/2 of soft interlayer burial depth,demands of both energy level control and construction efficiency can be satisfied;when soft interlayer burial depth is larger than 10 m or its thickness exceeds 2 m,reinforcement difficulty is larger,combining other construction methods is needed for joint reinforcement treatment.

关 键 词：强夯 软弱夹层 任意拉格朗日-欧拉(ALE)法 夯击参数 地基加固 

分 类 号：TU435[建筑科学—岩土工程] TU447[建筑科学—土工工程]