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In-situ Horizontal Extrusion Test of Herbaceous Root-Soil with Different Root Types

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The influence of different types of roots on the soil is complex and still remains unclear. Four in-situ extrusion tests were conducted on two types of root systems, namely fibrous and tap root system, for three plants, Eleusine indica, Potentilla anserine, and Artemisia argyi, according to the classi-fication in Botany, and the thrust-displacement curves and failure patterns of different samples were analysed by comparison to fill the aforementioned gap. Results reveal that the roots can reduce the characteristics of soil brittleness and enhance its capability to resist large deformation, and different root types contribute different effects to the strain-hardening behavior of the root-soil mass. The contri-bution of the fibrous root system to strength is limited, whilst the tap root system substantially enhanc-es strength and stiffness. Results of failure patterns show that fibrous and tap root systems affect soil solidification and surface cracking reduction. However, the effect of the tap root system depends on the composition of lateral and tap roots: long and rich lateral roots are effective for resisting the creation of cracks, but thick tap roots with few and thin lateral roots may lead to several surface cracks.

root typesfibrous roottap rootin-situ horizontal extrusion testroot-soilcracksslope protection

Fangcui Liu、Shengwen Qi、Shenglin Qi、Xiaokun Hou、Yanrong Li、Guangming Luo、Lei Xue、Xueliang Wang、Juanjuan Sun、Songfeng Guo、Bowen Zheng

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Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029, China

University of Chinese Academy of Sciences, Beijing 100049, China

Innovation Academy for Earth Sciences, Chinese Academy of Sciences, Beijing 100029, China

China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC, Islamabad 45320, Pakistan

Government Affairs Service Center of Beijing Municipal Water Affairs Bureau, Beijing 100073, China

Department of Earth Sciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

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Strategic Priority Research Program of the Chinese Academy of SciencesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSecond Tibetan Plateau Scientific Expedition and Research Program(STEP)

XDA2309040241790442418250182019QZKK0904

2024

10.1007/s12583-022-1661-x

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(3)
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