干旱区生态环境知识资源中心(Arid): 西部矿区植被根系采动损伤特征及细观力学机制

Arid

	西部矿区植被根系采动损伤特征及细观力学机制
其他题名	Characteristics and mesoscopic mechanics of vegetation roots damage induced by mining in western mining area
	潘东江 1; 张农 1; 赵一鸣 1; 雷少刚 2
来源期刊	煤炭学报
ISSN	0253-9993
出版年	2017
卷号	42 期号:2 页码:373-380
中文摘要	根系损伤是西部干旱半干旱生态矿区开采植被退化的重要诱因,以神东矿区为背景,通过调研总结地表沉降、根系赋存及变形破坏特征,提出采动诱发根系损伤的应变控制和应力控制两类现象。建立等径单根界面剪切脱黏模型,分析开采扰动后根土界面的弹性-滑移-脱黏三阶段受力过程,得出根土界面剪应力-应变关系,揭示三种典型损伤的细观力学机制。进一步将矿区优势植物沙柳和沙蒿简化成全长锚固单元和根土复合层,采用FLAC~(3D)研究采动后全长锚固单元和根土复合层宏观响应的受力变形区划特征。结果表明:高拉应力是采空区上方全长锚固单元损伤的控制因素;表底层受力的非一致性和非整体性是引发采空区边界附近全长锚固单元损伤的控制因素。采空区上方根土复合底层剪应力水平高于表层,更容易形成大面积的压剪损伤区;采空区边界及以外根土复合表层拉应力水平高于底层,更容易形成拉伸损伤区。
英文摘要	Roots damage is an important inducement of vegetation degradation in western arid and semi-arid mining area when mining. Based on field investigation and related literatures on the background of Shendong mining area, this paper proposes two phenomena of roots damage induced by mining,strain controlling and stress controlling. Through building the interfacial shear debonding model of single equal-diameter root, the elastic-slipping-debonding" three stages of root-soil interface stress deformation process induced by mining are studied. The shear stress-strain curve of root-soil interface is deduced, and then the mesoscopic mechanics of three typical roots damage are revealed. Furthermore,by simplifying the dominant plants salix psammophila and artemisia desertorum into full length anchorage unit and root-soil composite layer, the force -deformation zoning characteristics of macroscopic response to mining is modeled with FLAC~(3D). The results show that high tensile stress is the control factor for full length anchorage unit above the gob span and that non-consistency and non-integral of force is the control factor for full length anchorage unit near the boundary of gob. The shear stress level on the bottom of root-soil composite layer above the gob is higher than that on the top,hence,it is easier to form a large area of shear damage area on the bottom of root-soil composite layer above the gob. The tensile stress level on the bottom of root-soil composite layer along and outside the boundary of gob is lower than that on the top,hence,it is easier to form a large area of tensile damage area on the top of root-soil composite layer along and outside the boundary of gob.
中文关键词	采动应力 ; 根系损伤机制 ; 界面剪切脱黏模型 ; 细观力学机制
英文关键词	mining-induced stress roots damage mechanism interfacial shear debonding model mesoscopic mechanics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MINING MINERAL PROCESSING
WOS研究方向	Mining & Mineral Processing
CSCD记录号	CSCD:5932735
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236279
作者单位	1.中国矿业大学(徐州)矿业工程学院, 深部煤炭资源开采教育部重点实验室, 徐州, 江苏 221116, 中国; 2.中国矿业大学(徐州)环境与测绘学院, 徐州, 江苏 221116, 中国
推荐引用方式 GB/T 7714	潘东江,张农,赵一鸣,等. 西部矿区植被根系采动损伤特征及细观力学机制[J],2017,42(2):373-380.
APA	潘东江,张农,赵一鸣,&雷少刚.(2017).西部矿区植被根系采动损伤特征及细观力学机制.煤炭学报,42(2),373-380.
MLA	潘东江,et al."西部矿区植被根系采动损伤特征及细观力学机制".煤炭学报 42.2(2017):373-380.