基于筛分试验的土石混合体三维数值建模方法研究  

Research on Three-dimensional Numerical Modeling Method of Soil-rock Mixture Based on Screening Test

作　　者：贾聿颉 李冬冬[3] JIA Yujie;LI Dongdong(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China;Key Laboratory of Water Management and Water Security for Yellow River Basin,Ministry of Water Resources(under construction),Zhengzhou 450003,China;North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]黄河勘测规划设计研究院有限公司,河南郑州450003 [2]水利部黄河流域水治理与水安全重点实验室(筹),河南郑州450003 [3]华北水利水电大学,河南郑州450046

出　　处：《华北水利水电大学学报（自然科学版）》2023年第2期97-103,共7页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

摘　　要：土石混合体在工程中普遍存在,如何快捷高效地获取准确的力学参数和研究其力学特性具有重要的实践意义。为此,基于土石混合体筛分试验数据,依据“双随机”原理,采用有限差分软件FLAC3D还原土石混合体细观结构,提出了一种相对便捷且实用的土石混合体三维随机模型构建方法,并将三轴数值仿真试验与室内三轴试验结果进行对比分析。结果表明:本文提出的模型构建方法可以较高程度地还原土石混合体的随机特性,可作为研究其力学特性的有效载体。数值分析结果表明:在三轴状态下,本文构建的模型能较好地反映出土石混合体的变形特性与强度特性,与室内试验结果较为一致。本文提出的模型构建方法便捷合理、可操作性强,对于研究土石混合体的力学特性具有参考意义。Soil-rock mixtures are ubiquitous in engineering,so how to quickly and efficiently obtain accurate mechanical parameters and study their mechanical properties has important practical significance.Therefore,based on the screening test data of soil-rock mixture and the″double randomness″principle,a relatively convenient and practical three-dimensional stochastic model construction method for soil-rock mixture is proposed by using the finite difference software FLAC3D to restore the microstructure of soil-rock mixture,and the results of triaxial numerical simulation tests and indoor triaxial tests are compared and analyzed.The results are as follows.The model construction method proposed in this paper can restore the random characteristics of soil rock mixture to a high degree,and can be used as an effective carrier for studying its mechanical properties.The numerical analysis results show that the model constructed in this paper can better reflect the deformation and strength characteristics of the soil rock mixture under the triaxial state,which is consistent with the indoor test results.The model construction method proposed in this paper is convenient,reasonable,and operable,which has reference significance for studying the mechanical properties of soil-rock mixtures.

关 键 词：土石混合体 三维随机模型 数值模拟 三轴试验 

分 类 号：TU411[建筑科学—岩土工程]