位移反分析法在超载预压数值模拟中的应用  

Application of displacement inverse analysis in numerical simulation of preloading

作　　者：张所庆 刘林 李焕君 李翔宇 邓欣仪 ZHANG Suo-qing;LIU Lin;LI Huan-jun;LI Xiang-yu;DENG Xin-yi(NORINCO International Co.,Ltd.,Beijing 100040,China;State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;Institute of Foundation Engineering,China Academy of Building Research Co.,Ltd.,Beijing 100013,China;Lehigh University,Bethlehem PA 18015,P.R.USA)

机构地区：[1]北方国际合作股份有限公司,北京100040 [2]建筑安全与环境国家重点试验室,北京100013 [3]中国建筑科学研究院有限公司地基基础研究所,北京100013 [4]里海大学,美国宾夕法尼亚州18015

出　　处：《地基处理》2021年第6期488-495,共8页Journal of Ground Improvement

基　　金：建研地基基础工程有限责任公司青年科研基金(20211602341030011)。

摘　　要：位移量测反演分析方法是以工程现场的量测位移作为基础信息反求实际岩土力学参数的方法。本文通过将位移反分析法应用到孟加拉博杜阿卡利1320 MW燃煤电站A区超载预压数值模拟中,采用摩尔-库伦本构模型,确定土层相关力学参数。结果显示,地表总沉降量与双曲线沉降计算法结果相近,说明所确定参数较合理。通过整理反演参数与地勘原参数,取得反演得到的弹性模量是地勘所提供压缩模量的0.27~0.5倍,而高渗透性土中反演得到的渗透系数是地勘所提供的8倍,低渗透性土中反演得到的渗透系数是地勘所提供的0.8倍。此外,采用此参数进行模拟可以得到卸载前土层平均固结度,已经达到87%,且桩端持力层下剩余变形沉降量不超过150 mm,为设计提供参考。The back analysis method of displacement measurement is a method of reversing the actual geotechnical mechanical parameters with the measured displacement of the engineering site as the basic information.In this paper,the displacement back analysis method is applied to the numerical simulation of overload preloading in zone A of the 1320 MW coal-fired power station in Boduakali,Bangladesh,and the Mohr Coulomb constitutive model is used to determine the relevant mechanical parameters of soil layer.The results show that the total surface settlement is close to the results by the hyperbolic settlement calculation method,indicating that the determined parameters are reasonable.By sorting out the inversion parameters and the original geological exploration parameters,the elastic modulus E obtained by inversion is 0.27-0.5 times of the compression modulus Es provided by geological prospecting,the permeability coefficient obtained by inversion in high permeability soil is 8 times of that provided by geological prospecting,and the permeability coefficient obtained by inversion in low permeability soil is 0.8 times of that provided by geological prospecting.In addition,the average consolidation degree of soil layer before unloading can be obtained by using this parameter,which has reached 87%,and the residual deformation and settlement amount under pile tip bearing layer is less than 150 mm,which provides reference for design.

关 键 词：超载预压 位移反分析 工后沉降 数值模拟 渗透系数 压缩模量 

分 类 号：TU45[建筑科学—岩土工程]