武汉地区土体硬化模型试验参数的应用分析  

Application of soil hardening model test parameters in Wuhan area

作　　者：王璐 邵勇 李光诚 陈明 唐立 熊晶 邓兴旺 Wang Lu;Shao Yong;Li Guangcheng;Chen Ming;Tang Li;Xiong Jing;Deng Xingwang(Wuhan Geological Prospecting Foundation Engineering Co.,Ltd,Wuhan,Hubei 430050;Hubei Institute of Urban Geological Engineering,Wuhan,Hubei 430050;Hubei Dijian Construction Co.,Ltd,Wuhan,Hubei 430050;MIDAS Information Technology Co.,Ltd,Beijing 100074)

机构地区：[1]武汉地质勘察基础工程有限公司,湖北武汉430050 [2]湖北省城市地质工程院,湖北武汉430050 [3]湖北地矿建设工程承包集团有限公司,湖北武汉430050 [4]北京迈达斯技术有限公司,北京100074

出　　处：《资源环境与工程》2024年第5期637-645,共9页Resources Environment & Engineering

基　　金：湖北省地质局科技项目(KJ2023-46)。

摘　　要：试验研究得出武汉地区的切线模量E ref oed、割线模量E ref 50、卸载再加载模量E ref ur、黏聚力c′、内摩擦角φ′、失效率(破坏比)R f等土体硬化模型参数,将其代入基于一典型基坑支护工程案例所建立的精细化修正摩尔—库伦(MMC)有限元模型,把模拟计算结果与监测结果进行系统的对比分析,综合考虑模拟计算极值、监测极值、监测点布置位置和模拟节点位置的双重对应关系,初步探究将试验参数直接应用于实际工程建模分析的合理性和适用性。总体来看,模拟计算结果符合一般规律,与现场监测结果趋势在一定程度上吻合。从数值上看,全局模拟计算极值大于现场整体监测极值,周边道路沉降、周边建筑物沉降、围护结构顶部水平位移、围护结构深层水平位移的模拟计算极值分别为监测极值的1.06、1.84、1.84、1.73倍。从位置上看,得出以上4项监测项目的模拟计算极值与监测极值的位置均存在不同程度的对应差异,因此又分别对“模拟计算极值/模拟计算极值同位置处监测值”、“监测极值/监测极值同位置处模拟计算值”进行反向双重对比,以上4项监测项目倍数关系依次为1.07/2.52/2.14/2.1、1.06/1.09/2.12/1.18。另外,围护结构深层水平位移模拟计算值随深度的变化曲线与监测结果也存在一定差异。武汉地区土体硬化模型试验参数需要结合更多工程实例进行应用检验,在充分检验的基础上进行下一步的反演校核分析,并最终科学地给出指导性取值参数。The soil hardening model parameters such as tangent modulus E ref oed,secant modulus E ref 50,unloading modulus E ref ur,cohesion c′,internal friction angleφ′and failure rate(damage ratio)R f obtained from the experimental study in Wuhan were substituted into the refined MMC finite element model established based on a typical foundation pit support engineering case.The simulation results were systematically compared with the monitoring results,and the double correspondence between the extreme value of simulation calculation,the extreme value of monitoring,the location of monitoring points and the location of simulation nodes was comprehensively considered.The rationality and applicability of applying the test parameters directly to the actual engineering modeling analysis are preliminarily explored.In general,the simulation calculation results are in line with the general law,which is consistent with the trend of field monitoring results to a certain extent.From the numerical point of view,the extreme value of the global simulation calculation is greater than the overall monitoring extreme value of the site.The simulated extreme values of the settlement of the surrounding road,the settlement of the surrounding buildings,the horizontal displacement of the top of the retaining structure,and the deep horizontal displacement of the retaining structure are about 1.06,1.84,1.84,1.73 times of the monitoring extreme value,respectively.From the position point of view,there are different degrees of corresponding differences between the simulated calculation extreme value and the position of the monitoring extreme value of the above four monitoring items.Therefore,a reverse double comparison is made for“simulated calculation extreme values/monitoring extreme values at the same location”and“monitoring extreme values/monitoring extreme values at the same location”.The multiple relationships of the four monitoring items are 1.07/2.52/2.14/2.1,1.06/1.09/2.12/1.18,respectively.In addition,there are certain differenc

关 键 词：修正摩尔—库伦本构模型 硬化模型参数 有限元分析 武汉地区 

分 类 号：TU411.3[建筑科学—岩土工程]