[1]张欣,刘静*,刘铁军,等. 采煤塌陷区先锋植物含侧根分支处根段抗拉力学特性[J].西北林学院学报,2020,35(6):32-39.[doi:10.3969/j.issn.1001-7461.2020.06.05]
　ZHANG Xin,LIU Jing*,LIU Tie-jun,et al. The Anti-tension Force Characteristics of Lateral Root Branches of Pioneer Plant in the Coal Mining Subsidence Area[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2020,35(6):32-39.[doi:10.3969/j.issn.1001-7461.2020.06.05]
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 采煤塌陷区先锋植物含侧根分支处根段抗拉力学特性()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第35卷
期数:
2020年第6期
页码:
32-39
栏目:
出版日期:
2020-11-30

文章信息/Info

Title:
 The Anti-tension Force Characteristics of Lateral Root Branches of Pioneer Plant in the Coal Mining Subsidence Area
文章编号:
1001-7461(2020)06-0032-08
作者:
 张欣1; 刘静2*; 刘铁军1; 郭建英1; 荣浩1; 张铁钢1; 李雪松3
 （1.水利部 牧区水利科学研究所，内蒙古 呼和浩特 010020; 2.内蒙古农业大学 沙漠治理学院，内蒙古 呼和浩特 010019; 3.河北省水利科学研究院，河北 石家庄 050051）
Author(s):
 ZHANG Xin1; LIU Jing2*; LIU Tie-jun1; GUO Jian-ying1; RONG Hao1; ZHANG Tie-gang1; LI Xue-song3
 （1.Institute of Water Resource for Pasturing Area of the Ministry of Water Resources,Hohhot 010020,Inner Mongolia,China；2.Desert Science and Engineering College of Inner Mongolia Agricultural University,Hohhot 010019,Inner Mongolia,China；3.Hebei Provincial Academy of Water Resources,Shijiazhuang 050051,Hebei,China）
关键词:
 ; 黑沙蒿; 采煤塌陷区; 含侧根分枝处根段; 抗拉力; 弹塑性; 本构特性
Keywords:
Artemisia ordosica;  coal mining subsidence area;  lateral root branch;  anti-tension force;  elasto-plastic;  constitutive characteristics
分类号:
S157.2
DOI:
10.3969/j.issn.1001-7461.2020.06.05
文献标志码:
A
摘要:
 为了进一步完善植物根系固土力学机制，以神东矿区采煤塌陷区的先锋植物黑沙蒿为研究对象，采用TY8000伺服式强力机研究其含侧根分支处根段的抗拉力学特性。结果表明，随根径的增加，黑沙蒿含侧根分支处根段的抗拉力逐渐增加，抗拉强度逐渐下降；在轴向拉力反复加载下，试验根由弹性变形逐渐过渡到塑性变形，表现出明显的弹塑性特征；试验根的σ～ε曲线主要分为直线型、上凸型、多峰型、波动型4种，除σ～ε曲线外，其余3种σ～ε曲线基本均以上凸型逐渐达到第1个峰值；各径级代表性σ～ε曲线的极限弹性应力由4.62 MPa降至2.25 MPa，而极限弹性应变无变化规律。黑沙蒿含侧根分支处根段的抗拉力与根径呈幂函数正相关，抗拉强度与根径呈幂函数负相关；试验根在轴向拉力下表现出弹塑性特征；随应变的不断增加，试验根应力由快速增长过渡为缓慢增长；试验根的极限弹性应力与根径呈负相关，而极限弹性应变与根径无相关性。
Abstract:
 In order to further improve the mechanism of soil consolidation by plant roots,we took Artemisia ordosica which was one of the pioneer plants in the coal mining subsidence area of Shendong mining area as the research object.We adopted servo-type strength tester TY8000 to research the anti-tensile mechanical property characteristics of lateral root branches of A.ordosica.The results showed that with the increase of root diameter,the anti-tensile force of the lateral root branches increased gradually,and the anti-tensile strength decreased gradually.Under the repeated loading of axial anti-tensile force,the test roots gradually transited from the elastic deformation to the plastic deformation stage.The σ(stress)～ε(strain) curve of test roots could be mainly divided into 4 types:the linear type,the up-convex type,the multimodal type,and the fluctuation type.Except for the linear type,the other 3 kinds of σ～ε curves basically showed the up-convex type before reaching the first peak.The ultimate elastic stress of the σ～ε curves of each diameter level decreased from 4.62 MPa to 2.25 MPa,but the changes of ultimate elastic strain did not showed regular pattern.There existed exponential negative correlations between the diameter of lateral root branches,and exponential positive correlation between the diameter of lateral root branches and anti-tensile strength.The test roots showed the characteristics of elasto-plastic deformation under the loading of anti-tensile force.The stress changed from rapid growth to slow growth with the continuous increase of strain.The ultimate elastic stress had a negative correlation with the root diameter,but the ultimate elastic strain was not correlated to the root diameter.

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备注/Memo

备注/Memo:
 收稿日期：2020-01-06修回日期：2020-04-21
基金项目：内蒙古自治区自然科学基金项目“柠条根与内蒙中西部两种主要土壤根土界面摩阻特性研究”（2017MS0378）；国家自然科学基金“根系固土抗蚀受损后自我修复的力学特性”（51364034）、“荒漠草原植被根-土系统响应环境变化的自调控机理研究”（51779156）；内蒙古自治区科技计划项目“呼包鄂榆生态功能区发挥根系持续固土力学特性的精准植被建设技术研究”。
作者简介：张欣，硕士在读。研究方向：水土保持。E-mail:nmmkszx@163.com
*通信作者：刘静，博士，教授。研究方向：水土保持。E-mail:Ljing58@126.com
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