黄土的连续加荷固结试验的有限元分析  

Finite element analysis of continuous loading consolidation test on loess

作　　者：刘婵 何文昌 张乾乾 Liu Chan;He Wenchang;Zhang Qianqian(Zhanjiang University of Science and Technology,Zhanjiang Guangdong 524088,China)

机构地区：[1]湛江科技学院,广东湛江524088

出　　处：《山西建筑》2024年第17期67-69,共3页Shanxi Architecture

基　　金：广东省教育厅普通高校青年创新人才项目(2021KQNCX139);湛江科技学院—广东平胜工程质量检测有限公司联合实验室(ZLGC-2022564)。

摘　　要：应用常应变率模型对重塑黄土进行有限元分析。通过不同的应变率模型试验,结果表明试样中竖向有效应力的增长速度随着应变率的增大而增大。应变率越大,加载后期最终的有效应力值也越大;孔压的上升速度越快,达到相同压缩量孔压所产生的幅值也越大,常应变率试验中孔压缓慢上升中途并未出现水压力消散的现象。常应变率试验在加载初期试样不同深度的水平面有效应力分布均匀,克服了常规固结试验中加荷瞬时,有效应力分布不均造成的试样压缩的不均匀这个缺点。与室内固结试验结果进行了比较分析,结果表明所采用的数值分析方法能较好地模拟黄土的固结试验过程,对揭示土体固结变形有一定的实际意义。A constant strain rate model was used in finite element analysis of remolded loess.Through model experiments at different strain rate,the results showed that the growth rate of vertical effective stress in the sample increases with the increase of strain rate.The larger the strain rate,the greater the final effective stress value in the later stage of loading,and the faster the pore pressure rises,and the larger the pore pressure amplitude is when the same compression amount is reached.In the constant strain rate test,the pore pressure does not dissipate during the slow rise of pore pressure.During the initial loading stage,the constant strain rate test has a uniform distribution of effective stress at different depths of the horizontal plane of the specimen,overcoming the disadvantage of uneven compression of the specimen caused by uneven distribution of effective stress during loading in conventional consolidation tests.A comparative analysis was conducted with the results of the laboratory consolidation test on the sample,and the results showed that the numerical analysis method used can simulate the consolidation test process of loess well,which has certain practical significance for revealing the consolidation deformation of soil.

关 键 词：常应变率 土体固结 有效应力 孔隙水压力 

分 类 号：TU411.5[建筑科学—岩土工程]