砂土类材料离散元细观参数的自动识别
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摘要
准确的细观参数是采用离散元进行合理模拟的前提,基于最优化理论,本文提出了一种砂土类材料离散元细观参数的自动标定方法:采用PFC离散元软件模拟砂土的双轴压缩试验,以使PFC数值模拟的应力–应变曲线与某标准砂土室内双轴压缩实验结果的误差最小为优化目标,采用模式搜索法实现砂土类材料离散元细观参数的自动标定。本文提出的离散元细观参数自动标定方法具有识别效率快,精度高的优点。
Accurate identification of mesoscopic parameters are the precondition to conduct the discrete element simulation reasonably. Based on the optimization theory, an automatic method for identifying mesoscopic parameters of sand material is proposed in this paper. The PFC software is used to simulate the biaxial compression test of a kind of standard sandy soil. By minimizing the error between the stressstrain curves obtained by conducting the PFC biaxial compression test and the laboratory test, mesoscopic parameters are identified automatically by using the mode search method. Numerical results show that the stress-strain curves obtained by the numerical simulation and the laboratory test agree very well with those based on the mesoscopic parameters obtained by using the proposed method in this paper, with high effciency and accuracy.
Accurate identification of mesoscopic parameters are the precondition to conduct the discrete element simulation reasonably. Based on the optimization theory, an automatic method for identifying mesoscopic parameters of sand material is proposed in this paper. The PFC software is used to simulate the biaxial compression test of a kind of standard sandy soil. By minimizing the error between the stressstrain curves obtained by conducting the PFC biaxial compression test and the laboratory test, mesoscopic parameters are identified automatically by using the mode search method. Numerical results show that the stress-strain curves obtained by the numerical simulation and the laboratory test agree very well with those based on the mesoscopic parameters obtained by using the proposed method in this paper, with high effciency and accuracy.
引文
1张洪武,秦建敏.基于非线性接触本构的颗粒材料离散元数值模拟.岩土工程学报,2006(11):1964-1969Zhang Hongwu,Qin Jianmin.Simulation of mechanical behaviors of granular materials by discrete element method based on mesoscale nonlinear contact law.Chinese Journal of Geotechnical Engineering,2006(11):1964-1969(in Chinese)
2曾远,周健.砂土的细观参数对宏观特性的影响研究.地下空间与工程学报,2008(3):499-503Zeng Yuan,Zhou Jian.Influence of micro parameters of sandy soil on its macro properties.Chinese Journal of Underground Space and Engineering,2008(3):499-503(in Chinese)
3徐小敏,凌道盛,陈云敏等.基于线性接触模型的颗粒材料细-宏观弹性常数相关关系研究.岩土工程学报,2010,32(7):991-998Xu Xiaomin,Ling Daosheng,Chen Yunmin,et al.Correlation of microscopic and macroscopic elastic constants of granular materials based on linear contact model.Chinese Journal of Geotechnical Engineering,2010,32(7):991-998(in Chinese)
4詹永祥,姚海林,张静波.黏性粗粒土颗粒宏细观力学参数相关性研究.铁道工程学报,2016,33(11):12-16Zhan Yongxiang,Yao Hailin,Zhang Jingbo.Research on the relationship between mesoscopic and macroscopic mechanical parameters of cohesive coarse grained soil.Journal of Railway Engineering Society,2016,33(11):12-16(in Chinese)
5刘畅,陈晓雪,张文等.PFC数值模拟中平行粘结细观参数标定过程研究.价值工程,2017,36(26):204-207Liu Chang,Chen Xiaoxue,Zhang Wen,et al.Study on the calibration process of parallel bonding meso-structure parameter in PFC numerical simulation.Value Engineering,2017,36(26):204-207(in Chinese)
6刘良军,曹智,王俊杰.基于线性平行粘结接触模型的岩石细观参数选取方法研究.水利与建筑工程学报,2017,15(5):123-128Liu Liangjun,Cao Zhi,Wang Junjie.Selection methods of rock micro-parameters based on the linear parallel bond contact model.Journal of Water Resources and Architectural Engineering,2017,15(5):123-128(in Chinese)
7许自立.非饱和土强度的三维颗粒流模拟.[硕士论文].北京:北京交通大学,2017Xu Zili.Numerical analysis of unsaturated soil strength with PFC3D.[Master Thesis].Beijing:Beijing Jiaotong University,2017(in Chinese)
8徐松.黏性土宏-细观参数关系的PFC2D模拟研究.中国水运,2017(8):74-76Xu Song.PFC2D simulation study on macro-meso parameter relationship of clay.Zhong Guo Shui Yun,2017(8):74-76(in Chinese)
9牛双建,冯文林,党元恒.细观参数对类砂岩材料宏观参数影响规律的颗粒流分析.河南理工大学学报(自然科学版),2017,36(2):135-141Niu Shuangjian,Feng Wenlin,Dang Yuanheng.Influence of micro-parameters on macroscopic parameters for sandstone materials analysis on particle flow code.Journal of Henan Polytechnic University(Natural Science),2017,36(2):135-141(in Chinese)
10陈宝林.最优化理论与算法.北京:清华大学出版社,1989Chen Baolin.Theory and Method of Optimization.Beijing:Tsinghua University Press,1989(in Chinese)
11 Fumio Tatsuoka MS,Taizo Kawamura,Fukushima S.Strength and deformation characteristics of sand in plane strain compression at extremely low pressures.Soil and Foundation,1986,26:65-84
12周健,池永.砂土力学性质的细观模拟.岩土力学,2003(6):901-906Zhou Jian,Chi Yong.Mesomechanical simulation of sand mechanical properties.Rock and Soil Mechanics,2003(6):901-906(in Chinese)
13曾远.土体破坏细观机理及颗粒流数值模拟.[博士论文].上海:同济大学,2006Zeng Yuan.Microscopic mechanics of soil failure and PFCnumerical simulation.[PhD Thesis].Shanghai:Tongji University,2006(in Chinese)
2曾远,周健.砂土的细观参数对宏观特性的影响研究.地下空间与工程学报,2008(3):499-503Zeng Yuan,Zhou Jian.Influence of micro parameters of sandy soil on its macro properties.Chinese Journal of Underground Space and Engineering,2008(3):499-503(in Chinese)
3徐小敏,凌道盛,陈云敏等.基于线性接触模型的颗粒材料细-宏观弹性常数相关关系研究.岩土工程学报,2010,32(7):991-998Xu Xiaomin,Ling Daosheng,Chen Yunmin,et al.Correlation of microscopic and macroscopic elastic constants of granular materials based on linear contact model.Chinese Journal of Geotechnical Engineering,2010,32(7):991-998(in Chinese)
4詹永祥,姚海林,张静波.黏性粗粒土颗粒宏细观力学参数相关性研究.铁道工程学报,2016,33(11):12-16Zhan Yongxiang,Yao Hailin,Zhang Jingbo.Research on the relationship between mesoscopic and macroscopic mechanical parameters of cohesive coarse grained soil.Journal of Railway Engineering Society,2016,33(11):12-16(in Chinese)
5刘畅,陈晓雪,张文等.PFC数值模拟中平行粘结细观参数标定过程研究.价值工程,2017,36(26):204-207Liu Chang,Chen Xiaoxue,Zhang Wen,et al.Study on the calibration process of parallel bonding meso-structure parameter in PFC numerical simulation.Value Engineering,2017,36(26):204-207(in Chinese)
6刘良军,曹智,王俊杰.基于线性平行粘结接触模型的岩石细观参数选取方法研究.水利与建筑工程学报,2017,15(5):123-128Liu Liangjun,Cao Zhi,Wang Junjie.Selection methods of rock micro-parameters based on the linear parallel bond contact model.Journal of Water Resources and Architectural Engineering,2017,15(5):123-128(in Chinese)
7许自立.非饱和土强度的三维颗粒流模拟.[硕士论文].北京:北京交通大学,2017Xu Zili.Numerical analysis of unsaturated soil strength with PFC3D.[Master Thesis].Beijing:Beijing Jiaotong University,2017(in Chinese)
8徐松.黏性土宏-细观参数关系的PFC2D模拟研究.中国水运,2017(8):74-76Xu Song.PFC2D simulation study on macro-meso parameter relationship of clay.Zhong Guo Shui Yun,2017(8):74-76(in Chinese)
9牛双建,冯文林,党元恒.细观参数对类砂岩材料宏观参数影响规律的颗粒流分析.河南理工大学学报(自然科学版),2017,36(2):135-141Niu Shuangjian,Feng Wenlin,Dang Yuanheng.Influence of micro-parameters on macroscopic parameters for sandstone materials analysis on particle flow code.Journal of Henan Polytechnic University(Natural Science),2017,36(2):135-141(in Chinese)
10陈宝林.最优化理论与算法.北京:清华大学出版社,1989Chen Baolin.Theory and Method of Optimization.Beijing:Tsinghua University Press,1989(in Chinese)
11 Fumio Tatsuoka MS,Taizo Kawamura,Fukushima S.Strength and deformation characteristics of sand in plane strain compression at extremely low pressures.Soil and Foundation,1986,26:65-84
12周健,池永.砂土力学性质的细观模拟.岩土力学,2003(6):901-906Zhou Jian,Chi Yong.Mesomechanical simulation of sand mechanical properties.Rock and Soil Mechanics,2003(6):901-906(in Chinese)
13曾远.土体破坏细观机理及颗粒流数值模拟.[博士论文].上海:同济大学,2006Zeng Yuan.Microscopic mechanics of soil failure and PFCnumerical simulation.[PhD Thesis].Shanghai:Tongji University,2006(in Chinese)