根土复合体加固露天矿山排土场边坡研究

doi:10.11872/j.issn.1005-2518.2023.06.080

摘要/Abstract

摘要：

露天矿山开采损毁大量土地资源，并引发植被受损和山体滑坡等一系列生态环境问题，植被修复是解决露天矿山排土场边坡生态环境和自然灾害的优选方法。通过开展室内单根拉伸和拉拔试验，分析根径、土壤压实度和根系埋深对根—土界面抗拔拉力的影响，并探究紫花苜蓿根系在拉拔作用下的力学性能与破坏机理。结果表明：（1）紫花苜蓿的抗拉拔力与根径呈正相关，抗拉拔强度与根径呈负相关，相关系数高达0.9以上；（2）紫花苜蓿的抗拔力随压实度的增加呈现出先增大后趋于平稳的变化趋势；（3）压实度越大，埋置深度对抗拔力的影响程度越小；根径越大，埋置深度对抗拉力的影响程度越大。根系拉拔特性研究为加固露天矿山排土场边坡提供了理论依据。

关键词: 根土复合体, 拉拔特性, 紫花苜蓿, 边坡稳定性, 根—土界面, 露天矿山排土场

Abstract:

The mining of open-pit mines destroys a large amount of land resources and causes a series of ecological and environmental problems such as vegetation damage and landslides.Vegetation restoration is the preferred method to solve the ecological environment and natural disasters of open-pit mine dump slopes.Aiming at the tensile properties of the interface between herbaceous plant roots and soil，alfalfa was taken as the research object，and the reinforcement effect of herbaceous plant roots on the shallow soil was used to improve the stability of open-pit mine dump slope. The effects of root diameter（0~2 mm），soil compaction（65%~95%） and root depth （8~15 cm） on the pull-out resistance of root-soil interface were analyzed by carrying out indoor single-root tensile and pull-out tests，and the mechanical properties and failure mechanism of alfalfa roots under pull-out were explored.The results show that：（1） The tensile and pull-out force of alfalfa increase with the increase of root diameter，while the tensile and pull-out strength decrease with the increase of root diameter.There is an obvious non-linear relationship between pull-out strength and root diameter，and the correlation coefficient is more than 0.9.The pull-out failure occurr when the pull-out failure reach the critical value of 0.73 mm.（2）With the increase of the degree of compaction，the pull-out resistance of alfalfa shows a trend of first increasing and then smoothly，indicating that after the peak of pull-out resistance，the friction force at the root-soil interface is greater than the tensile force of the root system，and the root system is broken.The greater the degree of compaction，the higher the probability of tensile failure.（3）The influence of buried depth on the pull-out resistance of alfalfa roots is related to the degree of compaction and root diameter.The greater the degree of compaction，the smaller the influence of buried depth on the pull-out resistance，and the greater the root diameter，the greater the influence of buried depth on the pull-out resistance.In Summary，root diameter，soil compaction and root burial depth are the main factors affecting the pull-out resistance of the root-soil interface.By studying the influence of root diameter，soil compaction and root buried depth on the pull-out resistance of root-soil interface can improve the stability of open-pit dump mine slope.

Key words: root-soil complex, pull-out characteristics, alfalfa, slope stability, root-soil interface, open-pit mine dump

中图分类号:

TD804

海龙, 冯丽鑫, 谭世林, 吕勇博. 根土复合体加固露天矿山排土场边坡研究[J]. 黄金科学技术, 2023, 31(6): 911-918.

Long HAI, Lixin FENG, Shilin TAN, Yongbo LV. Study on Reinforcement of Open-pit Mine Dump Slope by Root-Soil Composite[J]. Gold Science and Technology, 2023, 31(6): 911-918.

图/表 7

图1

表1

图2

图3

图4

图5

图6

参考文献 0

	Fan C C， Lu J Z， Chen H H，2021.The pullout resistance of plant roots in the field at different soil water conditions and root geometries［J］.Catena，207（4）：105593.
	Guan Shifeng， Xia Zhenyao， Zhang Lun，et al，2016.Pull-out test of Indiigofera ambiyantha Craib Root under horizontai load［J］.Journal of Yangtze River Scientific Research Institute，33（6）：24-28.
	Guo Huan， Chen Long， Tang Lixia，et al，2022.Experimental study on the pull-out friction of two kinds of slope protection shrubs in karst area［J］.Chinese Soil and Water Conservation Science，20（1）：128-135.
	Hong Dewei，2019.Study on Characteristics Between Roots of Pinus Tabuliformis and Soil of the Loess Plateau of Western Shanxi Province［D］.Beijing：Beijing Forestry University.
	Hu Xiasong， Chen Guichen， Zhou Guoying，et al，2012.A study of the mechanic strength of vegetation roots for roadbed slope protection in the Tuotuohe river region along the Qinghai-Tibet railway［J］.Hydrogeology and Engineering Geology，39（1）：107-113.
	Ji J N， Mao Z， Qu W B，et al，2019.Energy-based fibre bundle model algorithms to predict soil reinforcement by roots［J］.Plant and Soil，446：307-329.
	Ji X D， Cong X， Dai X Q，et al，2018.Studying the mechanical properties of the soil-root interface using the pullout test method［J］.Journal of Mountain Science，15（4）：882-893.
	Jia Caihong，2008.Soil Mechanics［M］.Beijing：Peking University Press.
	Liu Xiaoguang，2013.Study on Friction and Anchorage Characteristics Between Root System and Soil ［D］.Beijing：Beijing Forestry University.
	Mao Z J， Bi Y L， Geng M M，et al，2023.Pull-out characteristics of herbaceous roots of alfalfa on the loess in different growth stages and their impacts on slope stability［J］.Soil and Tillage Research，225：105542.
	Ministry of Housing and Urban-Rural Development of the People’s Republic of China，2019. Standard for soil test methods：［S］.Beijing：China Plan Publishing House.
	Pollen N，2007.Temporal and spatial variability in root reinforcement of streambanks：Accounting for soil shear strength and moisture［J］.Catena，69（3）：197-205.
	Schwarz M， Cohen D， Or D，2010.Root-soil mechanical interactions during pullout and failure of root bundles［J］.Journal of Geophysical Research，115（F4）：1-19.
	Song Weifeng， Chen Lihua， Liu Xiuping，2008.Review of theories of soil reinforcement by root system in forest ［J］.Soil and Water Conservation Bulletin，28（6）：180-186.
	Wang Cheng， Hu Xiasong， Liu Changyi，et al，2023.Study on the characteristics and influence factors of root pull-out resistance of six grasses in the source region of the yellow river ［J］.Acta Agrestia Sinica，31（1）：157-165.
	Wu Feng，2022.The influence of soil water content and compaction degree on the reinforcement effect of vegetation slope protection［J］.Water Conservancy Science and Technology and Economy，28（10）：28-31.
	Yang Q H， Zhang C B， Yao S M，et al，2022.Root distribution and root cohesion of two herbaceous plants in the loess plateau of China［J］.Sustainability，14（13）：8053.
	Yuan Shujuan，2010.Study on the Tensile Strength Resistance of Single Roots of Four Plants［D］. Hohhot：Inner Mongolia Agricultural University.
	Zhang Qiaoyan， Tang Lixia， Pan Lu，et al，2020.Mechanical properties of shrubs and applicability of model WU in Karst area［J］.Journal of Yangtze River Scientific Research Institute，37（12）：53-58.
	Zhang Yongliang， Xing Huiwen， Liu Jing，et al，2009.Study of anti-tensile strength characteristics on root-soil interface of Caragana korshinskii Kom and Salix psammophila C.wang et Ch.Y.Yang［J］.World Rorestry Research，22：52-56.
	Zheng Mingxin， Huang Gang， Peng Jing，2018.Tensile-pullout properties of roots of Magnolia multiflora in different growth stages and stability of slope with its root［J］.Journal of Agricultural Engineering，34（20）：175-182.
	Zhou Y， Wang X，2019.Mesomechanics characteristics of soil reinforcement by plant roots［J］.Bulletin of Engineering Geology and the Environment，78（5）：3719-3728.
	Zhou Yunyan，2010.Research on Plant Root Consolidation Mechanism and Slope Protection Technology［D］.Beijing：China University of Geosciences.
	Zhu J Q， Mao Z， Wang Y Q，et al，2022.Soil moisture and hysteresis affect both magnitude and efficiency of root reinforcement［J］.Catena，219：106574.
	Zhu Jinqi， Su Boru， Wang Yunqi，et al，2020.Changes of soil-fixing function of the root system of Thornybush with soil water content［J］.Forestry Science，56（6）：202-208.
	管世烽，夏振尧，张伦，等，2016.水平荷载作用下多花木蓝根系拉拔试验研究［J］.长江科学院院报，33（6）：24-28.
	郭欢，陈龙，唐丽霞，等，2022.喀斯特区2种护坡灌木单根拉拔摩擦试验［J］.中国水土保持科学，20（1）：128-135.
	洪德伟，2019.晋西黄土区油松根系与土壤的摩擦力学特性研究［D］.北京：北京林业大学.
	胡夏嵩，陈桂琛，周国英，等，2012.青藏铁路沱沱河段路基边坡植物护坡根系力学强度试验研究［J］.水文地质工程地质，39（1）：107-113.
	贾彩虹，2008.土力学［M］.北京：北京大学出版社.
	刘小光，2013.林木根系与土壤摩擦锚固性能研究［D］.北京：北京林业大学.
	宋维峰，陈丽华，刘秀萍，2008.林木根系固土的理论基础［J］.水土保持通报，28（6）：180-186.
	王程，胡夏嵩，刘昌义，等，2023.黄河源区六种草本植物根系抗拔力特征及其影响因素研究［J］.草地学报，31（1）：157-165.
	吴凤，2022.土壤含水量和压实度对植被护坡加固效果的影响［J］.水利科技与经济，28（10）：28-31.
	苑淑娟，2010.4种植物单根抗拉力学特性的研究［D］.呼和浩特：内蒙古农业大学.
	张乔艳，唐丽霞，潘露，等，2020.喀斯特地区灌木根系力学特性及WU模型适用性研究［J］.长江科学院院报，37（12）：53-58.
	张永亮，邢会文，刘静，等，2009.柠条、沙柳根—土界面抗阻拉力特性研究［J］.世界林业研究，22：52-56.
	郑明新，黄钢，彭晶，2018.不同生长期多花木兰根系抗拉拔特性及其根系边坡的稳定性［J］.农业工程学报，34（20）：175-182.
	中华人民共和国住房和城乡建设部，2019. 土工试验方法标准：［S］.北京：中国计划出版社.
	周云艳，2010.植物根系固土机理与护坡技术研究［D］.北京：中国地质大学.
	朱锦奇，苏伯儒，王云琦，等，2020.荆条根系的固土功能随土壤含水率的变化［J］.林业科学，56（6）：202-208.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

土体类型	参数	数值
浅层土	含水率/%	8.7
	天然密度/（g·m^-3）	1.43
	内摩擦角/（°）	17.8
	黏聚力/kPa	8.3

[1]	杨明财, 盛建龙, 叶祖洋, 董舒. 基于FlAC3D的露天矿边坡稳定性及影响因素敏感性分析[J]. 黄金科学技术, 2018, 26(2): 179-186.
[2]	赵彬，李小贝，戴兴国，王新民，张德明. 基于变权重理论的边坡稳定性未确知分析[J]. 黄金科学技术, 2016, 24(6): 90-95.