Hydraulic and mechanical characteristics of ecological slopes: experimental study

CHENG Peng; LI Jin-hui; SONG Lei

doi:10.11779/CJGE201710019

Volume 39 Issue 10

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Chinese Journal of Geotechnical Engineering > 2017 > 39(10): 1901-1907. > DOI: 10.11779/CJGE201710019

CHENG Peng, LI Jin-hui, SONG Lei. Hydraulic and mechanical characteristics of ecological slopes: experimental study[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(10): 1901-1907. DOI: 10.11779/CJGE201710019

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Hydraulic and mechanical characteristics of ecological slopes: experimental study

1. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;
2. Shenzhen City Construction Comprehensive Survey and Design Institute Co., Ltd., Shenzhen 518055, China

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Received Date: June 29, 2016
Published Date: October 24, 2017

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The biotechnical slope protection is a new method to protect slopes, which helps to prevent and control landslide. However, the vegetation roots can increase the permeability and pore water pressure of soils, which in turn decrease the shear strength of soils under rainfall conditions. On the other hand, the roots can be viewed as fibers in the soils and may increase the strength of soils. The controversial effect of roots on the soils remains unclear. The hydraulic and mechanical characteristics are analyzed through field monitoring combined with triaxial compression tests. Firstly, three soil regions (with Vetiver grass, with Bermuda grass and bare soil) are prepared in the field. The monitoring of volumetric water content and matric suction begins after these regions experience natural drying-wetting cycles for one year and a half. The unsaturated permeability functions for the three soils are calculated using the monitored data. Secondly, the soils are sampled from the field and used to conduct trixial tests in lab. The stress-strain curves for the soils with Vetiver roots, the soils with Bermuda, the bare soils and the compacted soils are investigated. The cohesions and friction angles of soils are obtained. The results may provide necessary data in the stability analysis of ecological slopes.
- vegetation,
- field monitoring,
- permeability function,
- triaxial compression test,
- reinforced effect

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Hydraulic and mechanical characteristics of ecological slopes: experimental study

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