Publication detail

Uncertainty in Determining the Critical Hydraulic Gradient of Uniform Glass Beads

PETRULA, L. HALA, M. ŘÍHA, J.

Original Title

Uncertainty in Determining the Critical Hydraulic Gradient of Uniform Glass Beads

Type

conference paper

Language

English

Original Abstract

One of the local defects in soils due to seepage is heave. This may occur at the downstream toe of hydraulic structures in the case of upward external seepage where particles of uniform soils are subject to uplift and also upward seepage forces. The phenomena starts with gradual liquefaction of soil grains accompanied by gradual loss of shear strength followed by boiling, heave and possible backward erosion and overall collapse of the structure. The problem of heave has been addressed by numerous authors who have published relationships based on the balance of forces and also on results of laboratory experiments. In this paper the results of extensive systematic experimental research carried on glass beads subjected to upward seepage in the vertical Darcy apparatus are presented. Three glass beads’ diameters 0.2 mm, 0.5 mm and 1.0 mm with uniformity coefficient CU from 1.1 to 1.3 and different porosity n from 0.36 to 0.44 were tested. To enable statistical evaluation of the uncertainty in critical hydraulic gradient 177 individual tests have been performed. The results of measurements were analysed and compared with relationships proposed by various authors. The best agreement was provided by the wellknown Terzaghi formula relating the critical gradient to the specific mass of grains and soil porosity. Based on the experimental data the uncertainty in the use of Terzaghi formula was expressed via reliability coefficients recommended for use in technical practice.

Keywords

Critical hydraulic gradient; heave; non-cohesive soil; uniform soil; Terzaghi

Authors

PETRULA, L.; HALA, M.; ŘÍHA, J.

Released

10. 9. 2018

Publisher

Springer, Cham

Location

Cham, Švýcarsko

ISBN

978-3-319-99423-9

Book

Internal Erosion in Earthdams, Dikes and Levees: Proceedings of EWG‐IE 26th Annual Meeting 2018

Edition number

1

Pages from

81

Pages to

90

Pages count

10

URL

https://link.springer.com/book/10.1007/978-3-319-99423-9#about

BibTex

@inproceedings{BUT150030,
  author="Lubomír {Petrula} and Mario {Hala} and Jaromír {Říha}",
  title="Uncertainty in Determining the Critical Hydraulic Gradient of Uniform Glass Beads",
  booktitle="Internal Erosion in Earthdams, Dikes and Levees: Proceedings of EWG‐IE 26th Annual Meeting 2018",
  year="2018",
  number="1",
  pages="81--90",
  publisher="Springer, Cham",
  address="Cham, Švýcarsko",
  doi="10.1007/978-3-319-99423-9\{_}8",
  isbn="978-3-319-99423-9",
  url="https://link.springer.com/book/10.1007/978-3-319-99423-9#about"
}