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Influence of vetiver root on strength of expansive soil-experimental study.

ABSTRACT: Grassroots have received more attention than the traditional method as soil reinforcement materials, especially the use of vetiver and other vegetation protection methods to treat expansive soil slope, have been tried and applied. To study the influence of grassroots on the strength properties of expansive soil, the laws of vetiver root growth over time and its vertical distribution of root content(?) were firstly investigated by the experiment of planting vetiver. Then different ? and depth of planted soil were obtained. Simultaneously different ? and water content(?) of grafted soil were made. With the direct shear test, the shear strength parameters of root-soil with different ? were analyzed. The shear test on root-soil composites with different ? was carried out to compare the strength characteristics of planted and grafted soil. The results showed that the ? of vetiver decreased with the increase of depth, and the ? of each layer increased with the growth period. The ? of 180d was 70.5% higher than that of 90d. The cohesion(c) of root-soil can be increased by more than 97%, and internal friction angle(?) can be increased by more than 15.4% after 180 days. The c of 90 d vetiver root system can be increased by more than 18%, and the ? can be increased by more than 1.5%. At each depth, the c and ? of composite soil increases with the increase of ?, and the increment of cohesion (?c) and the increment of internal friction angle (??) increase with the increment of ?. But the increase in the ? will weaken the shear strength parameters of root-soil. Under the condition of the planted root system and grafted root system, the influence degree of ? on strength parameter of root-soil is different, and the law of strength parameters versus ? of grafted soil of 365d is similar to that of planted soil of 90d. And the root reinforcement of grafted soil is weaker than planted soil. Hence the grafted soil can´t accurately reflect the root-soil interaction of the existing root system.

SUBMITTER: Wang GY

PROVIDER: S-EPMC7775112 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Influence of vetiver root on strength of expansive soil-experimental study.

Wang Gui-Yao GY Huang Yong-Gang YG Li Run-Fa RF Chang Jing-Mei JM Fu Jin-Liang JL

PloS one 20201231 12

Grassroots have received more attention than the traditional method as soil reinforcement materials, especially the use of vetiver and other vegetation protection methods to treat expansive soil slope, have been tried and applied. To study the influence of grassroots on the strength properties of expansive soil, the laws of vetiver root growth over time and its vertical distribution of root content(δ) were firstly investigated by the experiment of planting vetiver. Then different δ and depth of ...[more]

PMID: 33382833

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Project description:To study the soil-water characteristics and shear strength of unsaturated complete-intense weathering mudstone, the soil-water characteristic curve of complete-intense weathering mudstone and the matric suction of mudstone samples under natural state were measured. This measurement was through a soil-water characteristic test using a pressure plate instrument. Based on the results of soil-water characteristic test, an unsaturated (saturated) triaxial shear test was carried out. Under different temperatures and confining pressure conditions, the shear strength and deformation characteristics of complete-intense weathering mudstone under natural water content and saturation conditions were investigated. The results show that the percentage of silt and clay in unsaturated complete-intense weathering mudstone in natural state is relatively high, with the mudstone having less sand, and a weak permeability and exhibiting a significant capillary phenomenon. The complete-intense weathering mudstone with a natural moisture content of 19.15% has a matric suction of 210 kPa. When the temperature is constant, the shear stress of the sample increases with the increase of confining pressure. When the temperature decreases from 0 to -20°C, the influence of confining pressure on the rock samples gradually decreases. The rock sample has the property of strain hardening during shearing. Under the same matric suction, the total cohesion increases with the decrease of temperature. At a positive temperature, the effective internal friction angle increases with the decrease of temperature. At a negative temperature, the lower the temperature, the smaller the effective internal friction angle. The test of shear strength parameters of saturated complete-intense weathering mudstone is simple and conservative. In practical engineering, the basic properties of unsaturated complete-intense weathering mudstone can be predicted by testing the shear strength parameters of saturated complete-intense weathering mudstone. The results of the study are important for better understanding the nature of unsaturated complete-intense weathering mudstone and improving the safety of engineering construction in complete-intense weathering mudstone areas.

Dataset Information

Influence of vetiver root on strength of expansive soil-experimental study.

Publications

Influence of vetiver root on strength of expansive soil-experimental study.

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