湿筛混凝土动态受压力学性能及破坏形态细观数值模拟

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (7): 2283-2291.

湿筛混凝土动态受压力学性能及破坏形态细观数值模拟

张清芳¹, 洪鹤轩¹, 沈璐^1,2

1.大连海洋大学海洋与土木工程学院,大连 116023;
2.大连海洋大学辽宁省海洋牧场工程技术研究中心,大连 116023

收稿日期:2022-03-13 修回日期:2022-04-19 出版日期:2022-07-15 发布日期:2022-08-01
通讯作者: 沈璐,博士,副教授。E-mail:shenlu1982@163.com
作者简介:张清芳(1996—),女,硕士研究生。主要从事水工结构工程研究。E-mail:zhangqingfangdlou@163.com
基金资助:
辽宁省教育厅2021年度科学研究经费项目(LJKZ0719);大连市科技创新基金(2021JJ11CG001);国家自然科学基金面上项目(51079019);大连海洋大学第三届“蔚蓝英才工程”资助项目

Meso-Numerical Simulation of Dynamic Compressive Performance and Failure Mode of Wet-Screened Concrete

ZHANG Qingfang¹, HONG Hexuan¹, SHEN Lu^1,2

1. Institute of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, China;
2. Center for Marine Ranching Engineering Science Research of Liaoning, Dalian Ocean University, Dalian 116023, China

Received:2022-03-13 Revised:2022-04-19 Online:2022-07-15 Published:2022-08-01

摘要/Abstract

摘要： 湿筛混凝土通常用来代替由于骨料粒径较大而不便开展物理试验的水工全级配混凝土。为了研究加载速率对湿筛混凝土力学性能及破坏形态的影响,从细观角度出发,运用颗粒流离散元软件PFC^2D建立湿筛二级配混凝土细观数值试件,根据拟静态单轴压缩(应变速率10^-5 s^-1)试验数据标定出数值试件中砂浆颗粒之间、粗骨料颗粒之间及砂浆颗粒与粗骨料颗粒接触面之间的细观参数,进而开展应变速率为10^-4 s^-1、10^-3 s^-1、10^-2s^-1的动态加载并进行动态力学性能及破坏形态的数值模拟和机理分析。结果表明,不同应变速率下试件的应力-应变曲线形状相近,峰值应力随着应变速率的增加而增大,增长率为7.3%～37.9%,峰值应力处应变增大幅度不大。试件破坏形态与物理试验现象吻合较好,随着应变速率的增加,裂缝数量不断增加,裂缝分布趋于均匀,裂缝数量增长率平均为峰值应力增长率的4.2倍。此外,随着应变速率的增加,数值试件内部的颗粒接触力的不均匀程度有所降低,这表明动态强度的增长与混凝土内部受力的不均匀程度有关。

关键词: 湿筛混凝土, PFC^2D, 应变速率, 应力-应变关系, 细观参数, 破坏形态

Abstract: Wet-screened concrete is usually used to replace hydraulic fully graded concrete which is inconvenient to carry out physical test due to the large aggregate size. In order to study the influence of loading rate on the mechanical properties and failure modes of wet-screened concrete, the meso-numerical specimen of wet-screened two-graded concrete was established by using particle flow discrete element software PFC^2D. The meso-parameters of mortar particles, coarse aggregate particles and the interface between mortar particles and coarse aggregate particles in the numerical specimen were calibrated according to the quasi-static uniaxial compression test data with strain rate of 10^-5 s^-1. Then dynamic loading with strain rates of 10^-4 s^-1, 10^-3 s^-1 and 10^-2 s^-1 was carried out, and numerical simulation and mechanism analysis of dynamic mechanical properties and failure modes were conducted. The results show that the shapes of stress-strain curves under different strain rates are similar, the peak stress increases by 7.3%~37.9% with the increase of strain rate, and the strain at the peak stress increases little. The failure mode of the specimen is in good agreement with the physical test phenomenon. With the increase of strain rate, the number of cracks continues to increase, and the cracks distribution tend to be uniform. The growth rate of the number of cracks is 4.2 times of the growth rate of peak stress. In addition, with the increase of strain rate, the non-uniformity of particle contact force in the numerical specimen decreases, which indicates that the increase of dynamic strength is related to the non-uniformity of stress in the concrete.

Key words: wet-screened concrete, PFC^2D, strain rate, stress-strain relationship, meso-parameter, failure mode

中图分类号:

TU528

张清芳, 洪鹤轩, 沈璐. 湿筛混凝土动态受压力学性能及破坏形态细观数值模拟[J]. 硅酸盐通报, 2022, 41(7): 2283-2291.

ZHANG Qingfang, HONG Hexuan, SHEN Lu. Meso-Numerical Simulation of Dynamic Compressive Performance and Failure Mode of Wet-Screened Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2283-2291.

参考文献

[1] 邓宗才.高性能大坝混凝土的强度与变形[M].北京:科学出版社,2006.
DENG Z C. Strength and deformation of high performance dam concrete[M]. Beijing: Science Press, 2006 (in Chinese).
[2] 周昌巧,徐磊,荆帅召,等.原级配和湿筛混凝土断裂性能差异的骨料含量效应[J].人民长江,2019,50(9):187-191.
ZHOU C Q, XU L, JING S Z, et al. Effect of aggregate contents of original-graded and wet-screened concrete on concrete fracturing behavior[J]. Yangtze River, 2019, 50(9): 187-191 (in Chinese).
[3] 荆帅召,杨鑫,周昌巧,等.骨料级配对水工全级配和湿筛混凝土拉伸断裂性能差异的影响[J].三峡大学学报(自然科学版),2018,40(6):11-15.
JING S Z, YANG X, ZHOU C Q, et al. Effect of aggregate gradation on differences of tensile fracturing behaviors of hydraulic fully-graded and wet-screened concretes[J]. Journal of China Three Gorges University (Natural Sciences), 2018, 40(6): 11-15 (in Chinese).
[4] 石妍,刘战鳌,周世华,等.锈染骨料对湿筛与全级配大坝混凝土力学性能的影响对比[J].长江科学院院报,2021,38(12):146-151.
SHI Y, LIU Z A, ZHOU S H, et al. Influence of rusty aggregate on mechanical properties of wet-screened and fully-graded dam concretes[J]. Journal of Yangtze River Scientific Research Institute, 2021, 38(12): 146-151 (in Chinese).
[5] SERRA C, BATISTA A L, MONTEIRO AZEVEDO N. Effect of wet screening in the elastic properties of dam concrete: experimental in situ test results and fit to composite models[J]. Journal of Materials in Civil Engineering, 2016, 28(12): 04016146.
[6] SERRA C, BATISTA A L, AZEVEDO N M, et al. Prediction of dam concrete compressive and splitting tensile strength based on wet-screened concrete test results[J]. Journal of Materials in Civil Engineering, 2017, 29(10): 04017188.
[7] 王立成,施林林,宋玉普.三向受力状态下大骨料和湿筛混凝土动态强度特性研究[J].水利学报,2014,45(s1):77-83.
WANG L C, SHI L L, SONG Y P. Dynamic behavior of strength of dam and wet-screened concrete under triaxial stress[J]. Journal of Hydraulic Engineering, 2014, 45(s1): 77-83 (in Chinese).
[8] SHEN L, WANG L C, SONG Y P, et al. Comparison between dynamic mechanical properties of dam and sieved concrete under biaxial tension-compression[J]. Construction and Building Materials, 2017, 132: 43-50.
[9] 沈璐,宋玉普,尹翠.湿筛二级配大坝混凝土双轴动态受压特性试验[J].混凝土,2017(1):6-10.
SHEN L, SONG Y P, YIN C. Experimental study of two-graded wet-screened dam concrete under dynamic biaxial compression loading[J]. Concrete, 2017(1): 6-10 (in Chinese).
[10] 沈璐,宋玉普,陈仁进.湿筛二级配大坝混凝土动态双轴拉压强度与破坏准则[J].沈阳建筑大学学报(自然科学版),2016,32(4):584-590.
SHEN L, SONG Y P, CHEN R J. Dynamic strength and failure criterion of two-graded wet-screened dam concrete under biaxial tension-compression loading[J]. Journal of Shenyang Jianzhu University (Natural Science), 2016, 32(4): 584-590 (in Chinese).
[11] 施林林,宋玉普,沈璐.不同应变率下大骨料及湿筛混凝土单轴受压试验研究[J].世界地震工程,2016,32(2):270-276.
SHI L L, SONG Y P, SHEN L. Experimental study on uniaxial compression properties of large aggregate and wet-screened concrete at different strain rates[J]. World Earthquake Engineering, 2016, 32(2): 270-276 (in Chinese).
[12] 马怀发,陈厚群,黎保琨.混凝土细观力学研究进展及评述[J].中国水利水电科学研究院学报,2004,2(2):124-130.
MA H F, CHEN H Q, LI B K. Review on micro-mechanics studies of concrete[J]. Journal of China Institute of Water, 2004, 2(2): 124-130 (in Chinese).
[13] 金浏.细观混凝土分析模型与方法研究[D].北京:北京工业大学,2014.
JIN L. Study on meso-scopic model and analysis method of concrete[D]. Beijing: Beijing University of Technology, 2014 (in Chinese).
[14] 杜修力,金浏.细观分析方法在混凝土物理/力学性质研究方面的应用[J].水利学报,2016,47(3):355-371.
DU X L, JIN L. Applications of meso-scale analysis methods on the study of the physical/mechanical properties of concrete[J]. Journal of Hydraulic Engineering, 2016, 47(3): 355-371 (in Chinese).
[15] 李国栋,张立,任正义.细观尺度下混凝土的工作性能研究[J].硅酸盐通报,2020,39(3):779-786.
LI G D, ZHANG L, REN Z Y. Study on working performance of concrete under mesoscale[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(3): 779-786 (in Chinese).
[16] 戎虎仁,王海龙,曹海云,等.裂纹损伤混凝土力学性质试验与PFC模拟研究[J].混凝土,2018(3):8-12.
RONG H R, WANG H L, CAO H Y, et al. Experimental study on mechanical properties of concrete with crack damage and PFC simulation[J]. Concrete, 2018(3): 8-12 (in Chinese).
[17] CUNDALL P A, STRACK O D L. A discrete numerical model for granular assemblies[J]. Géotechnique, 1979, 29(1): 47-65.
[18] 李守巨,李德,于申.基于宏观实验数据的堆石料细观本构模型参数反演[J].山东科技大学学报(自然科学版),2015,34(5):20-26.
LI S J, LI D, YU S. Meso-parameter inversion of constitutive model for rockfill materials based on macro experimental data[J]. Journal of Shandong University of Science and Technology (Natural Science), 2015, 34(5): 20-26 (in Chinese).
[19] 李守巨,王颂,于贺.堆石料细观本构参数反演的CLUMP颗粒模型[J].黑龙江科技大学学报,2018,28(1):85-90.
LI S J, WANG S, YU H. CLUMP particle model for microparameters inversion of rockfill[J]. Journal of Heilongjiang University of Science and Technology, 2018, 28(1): 85-90 (in Chinese).
[20] 王颂.基于宏观实验数据的混凝土材料细观本构模型参数反演[D].大连:大连理工大学,2018.
WANG S. Parameter inversion of micro constitutive model for concrete materials based on macro experimental data[D]. Dalian: Dalian University of Technology, 2018 (in Chinese).