Abstract
Background and aims
Surface protection of coalmine overburden (OB) dumps against shallow slope failures can be achieved through a cost-effective and sustainable solution, i.e., vegetative cover. Hence, a small-scale study is needed to study the survival, growth performance, and root distribution of plants prior to conducting a pilot-scale study.
Methods
In the present study, three plant species, Dendrocalamus strictus (Bamboo grass), Cymbopogon citratus (Lemon grass), and Chrysopogon zizanioides (Vetiver grass), an endemic grass species, are studied for the slope stabilization potential of OB dumps in Jharkhand, India. Growth characteristics and root architecture of grasses grown for five months under six varying proportions (treatments) of overburden, cow dung, and garden soil were studied.
Results
It was found that Vetiver grass had the highest root area ratio, followed by Bamboo grass and Lemon grass. The maximum root cohesion was found to be 1 kPa for Bamboo grass, 7.33 kPa for Lemon grass, and 9.24 kPa for Vetiver grass among different treatments.
Conclusions
Treatment condition with 80% overburden and 20% cow dung was suggested to be the best soil mix for optimum growth of the chosen grasses, which have the potential to mitigate surficial movement of soil mass on the overburden dumps through root reinforcement.
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Data availability
This article has all the data that were created or evaluated during this investigation.
Abbreviations
- OB:
-
Overburden
- BG:
-
Bamboo grass
- LG:
-
Lemon grass
- VG:
-
Vetiver grass
- OA:
-
Organic amendment
- GS:
-
Garden soil
- BCCL:
-
Bharat Coking Coal Limited
- RD :
-
Root density
- RV :
-
Root volume
- M d :
-
Dry root mass
- V :
-
Volume of soil sample
- RAR :
-
Root area ratio
- A r :
-
Root area
- A :
-
Cross-sectional area of soil at any depth
- n :
-
Total number of roots at any depth
- A i :
-
Area of ith root
- d :
-
Root diameter
- T r :
-
Root tensile strength
- UTM:
-
Universal testing machine
- Fp :
-
Peak tensile force
- A rr :
-
Root cross-sectional area at rupture
- a :
-
Scale factor
- b :
-
Rate of strength decay
- c r :
-
Root cohesion
- s r :
-
Shear strength of root-reinforced soil
- s :
-
Shear strength of bare soil
- t r :
-
Full mobilized root tensile strength unit area of soil
- θ :
-
Angle of shear distortion in the shear zone
- ϕ :
-
Soil friction angle
- ANCOVA:
-
Analysis of Covariance
- α :
-
Significance level
- R:
-
Statistical measure
- N :
-
Number of roots tested in tensile test
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Acknowledgements
This research was funded by the Ministry of Education, Government of India, SPARC Project No. P1207 titled “Geoenvironmental and Geotechnical Issues of Coalmine Overburden”.
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Kumar, A., Das, S.K., Nainegali, L. et al. Effect of grass species root for enhanced slope protection in amended coalmine overburden dump soil. Plant Soil 498, 505–522 (2024). https://doi.org/10.1007/s11104-023-06450-4
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DOI: https://doi.org/10.1007/s11104-023-06450-4