混凝土粮仓-粮食颗粒界面静动力特性直剪试验研究

郭呈周; 周飞; 曾长女

doi:10.16433/j.1673-2383.2022.03.015

1. 河南工业大学土木工程学院, 河南郑州 450001;

2. 河南工业大学人事处, 河南郑州 450001

基金项目:

粮食公益性行业科研专项(201513001)

河南省重点研发与推广专项科技攻关项目(212102110027)

详细信息

作者简介:
郭呈周(1965-),男,河南新乡人,高级工程师,一级注册结构工程师,研究方向为粮仓结构

通讯作者:
曾长女,教授,博导,E-mail:zengcnv@126.com

中图分类号: TS210

计量

文章访问数: 52
HTML全文浏览量: 6
PDF下载量: 10

Experimental study on static and dynamic characteristics of concrete granary-grain particle interface

1. College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China;

2. Human Resource Department, Henan University of Technology, Zhengzhou 450001, China

摘要: 粮仓-粮食颗粒界面静动力参数对粮仓结构设计及优化分析产生重要影响，需进一步明确混凝土粮仓-粮食颗粒界面静动力特性。利用自制的粮食动荷载直剪仪进行了混凝土粮仓与粮食颗粒界面静动力特性直剪试验，设计了不同孔隙比和竖向压力条件下的界面单调直剪、往复剪切及往复后单调直剪试验。结果表明：单调直剪试验中，界面剪切强度随着孔隙比减小、竖向压力增大而逐渐增加，界面整体呈剪缩现象，随着竖向压力和孔隙比的增大，最终剪缩量逐渐增加；往复剪切试验中，界面呈剪切硬化现象，剪应力峰值在往复过程中逐步提高并趋于稳定，动剪切模量随往复周数的增加而增大，其变化范围为7.39～18.15 kPa/mm，阻尼比逐渐减小并趋于稳定，其变化范围为0.39～0.47；往复后单调直剪试验的界面剪应力峰值大于单调直剪剪应力峰值，对应的内摩擦角和黏聚力强度参数也相应地提高。试验结果为混凝土粮仓结构设计提供计算参数依据。

关键词:

Abstract: Static and dynamic parameters of silo-grain interface greatly influence granary structure design and its optimization analysis. Therefore, these parameters are required to be further clarified. Under the conditions of different void ratios and vertical pressures, the monotonic direct shear tests, reciprocating test and post reciprocating monotonic direct shear tests were carried out using a self-developed grain dynamic loading direct shear apparatus. The results show that, in the monotonic direct shear test, the interface strength increases with the decrease of void ratio and the increase of vertical pressure. The interface volume presents the phenomenon of shear shrinkage, and with the increase of vertical pressure and void ratio, the final shear strain increases gradually. In the reciprocating test, the specimen shows shear hardening phenomenon, with the maximum shear stress increases and then gradually stabilizes during the reciprocating process. The dynamic shear modulus increases with the increase of the number of cycle numbers, ranging from 7.39 kPa/mm to 18.15 kPa/mm. The damping ratio first decreases and then tends to be stable with the range of 0.39-0.47. The peak value of interfacial shear stress in the post- reciprocating direct shear test is larger than that in the monotonic direct shear test, and the corresponding strength parameters are improved accordingly. The research results provide a theoretical basis for the design parameters of the static and dynamic working conditions of concrete granary-grain particle interface.

Keywords:

concrete granary-grain particle interface /
direct shear test /
reciprocating loading /
static and dynamic characteristics

[1]	张林杰. 分仓储存下粮食方筒仓受力的有限元分析 [D]. 郑州: 河南工业大学, 2018.
[2]	张昊, 孟庆婷, 陶元庆, 等. 地下粮仓塑料-混凝土防水体系抗水压试验 [J]. 农业工程学报, 2020, 36(21): 292-299.
[3]	曾长女, 冯伟娜. 小麦强度特性的三轴试验研究 [J]. 中国粮油学报, 2015, 30(5): 96-101.
[4]	熊晓莉, 金立兵, 王振清. 钢筋混凝土地下粮仓仓壁土压力取值方法及仓壁结构受力分析 [J]. 应用基础与工程科学学报, 2016, 24(1): 103-114.
[5]	王振清, 揣君, 王录民, 等. 装配式地下粮仓钢-混组合仓壁节点力学性能有限元分析 [J]. 农业工程学报, 2019, 35(24): 298-306, 327.
[6]	蒋敏敏, 郭祝辉. 竖向压力和剪切速率对小麦直剪强度及剪胀特性的影响 [J]. 农业工程学报, 2017, 33(6): 275-280.
[7]	SADOWSKI A J, ROTTER J M. Study of buckling in steel silos under eccentric discharge flows of stored solids [J]. Journal of engineering mechanics, 2010, 136(6): 769-776.
[8]	SADOWSKI A J, ROTTER J M. Buckling in eccentrically discharged silos and the assumed pressure distribution [J]. Journal of engineering mechanics, 2013, 139(7): 858-867.
[9]	WANG X W, YANG Z J, SHU X F, et al. The static contact statuses between granular materials and flat-bottomed steel silos [J]. Powder technology, 2013, 235: 1053-1059.
[10]	VERSAVEL P A, BRITTEN M G. Interaction of bulk wheat with Bin wall configuration in model bins [J]. Transactions of the ASAE, 1986, 29(2): 533-537.
[11]	COŞCKUN M B, YALÇıN İ ÖZARSLAN C. Physical properties of sweet corn seed (Zea mays Saccharata Sturt.) [J]. Journal of food engineering, 2006, 74(4): 523-528.
[12]	陆琳琳. 高大平房仓内粮食摩擦与压缩特性研究 [D]. 南京: 南京财经大学, 2012.
[13]	李萌. 基于粮食摩擦力效应的筒仓卸粮成拱机理研究 [D]. 郑州: 河南工业大学, 2019.
[14]	LI S Q, YANG Z P, TIAN X, et al. Influencing factors of scale effects in large-scale direct shear tests of soil-rock mixtures based on particle breakage [J]. Transportation geotechnics, 2021, 31: 100677.
[15]	SABERIAN M, LI J, PERERA S T A M, et al. Large-scale direct shear testing of waste crushed rock reinforced with waste rubber as pavement base/subbase materials [J]. Transportation geotechnics, 2021, 28: 100546.
[16]	张丰尧. 基于离散元法的大豆颗粒物理力学特性及细观机理研究 [D]. 郑州: 河南工业大学, 2019.
[17]	曾长女, 王萌, 许启铿, 等. 粮食直剪仪的改进与试验研究 [J]. 中国农机化学报, 2020, 41(4): 105-110.
[18]	李腾龙, 曾长女, 郭呈周. 大豆静力与动力剪切特性的试验研究 [J]. 中国油脂, 2020, 45(6): 132-136.
[19]	ZENG C N, LI X T, WANG Y K. Behaviour of the interface between stored wheat and a steel silo under static and cyclic loading conditions [J]. Biosystems engineering, 2020, 190: 87-96.
[20]	张丰尧, 刘克瑾, 王世豪. 基于离散单元法的大豆力学特性研究 [J]. 河南工业大学学报(自然科学版), 2019, 40(6): 94-99.
[21]	王萌, 曾长女, 周飞, 等. 静动荷载作用下小麦剪切特性试验研究 [J]. 农业工程学报, 2020, 36(14): 273-280.