Journal: Proceedings of the Institution of Civil Engineers - Geotechnical Engineering

Abbreviation

Proc. Inst. Civ. Eng., Geotech. eng.

Publisher

Institution of Civil Engineers

Journal Volumes

ISSN

1353-2618
1751-8563

Description

Filters

2009 - 200912010 - 20205
Reset filters

Search Results

Publications 1 - 6 of 6
  • A simplified numerical method to simulate the thawing of frozen soil
    Item type: Journal Article
    Loli, Marianna; Tsatsis, Angelos; Kourkoulis, Rallis; et al. (2020)
    Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
    Thawing weakens the frozen soil supporting buildings and lifelines from Siberia to Alaska, resulting in settlements up to hundreds of millimetres during a single season. This paper presents a simplified sequentially coupled numerical approach that can be implemented in a general purpose, commercially available finite-element analysis model. It is intended to provide a reasonably accurate computational tool for the analysis of structures on degrading permafrost, allowing modelling of complex three-dimensional geometries and boundary and loading conditions. The method permits simulation of the temperature-dependent thermal and mechanical properties of soils in an approximate manner. It accommodates large-strain consolidation theory, also allowing use of plasticity constitutive relationships. A thorough validation study was carried out involving comparison with monotonic and cyclic thaw consolidation element tests, analytical solutions and a well-documented case study of an unstable roadway embankment. The latter was complemented by an investigation of thaw-settlement remediation solutions using thermosyphons, with emphasis on the three-dimensional response and their transverse spacing.
  • Evaluation of ground freezing date from the Naples subway
    Item type: Journal Article
    Papakonstantinou, Spyridon; Anagnostou, Georgios; Pimentel, Erich (2013)
    Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
  • An investigation of plant-induced suction and its implications for slope stability
    Item type: Journal Article
    Yildiz, Anil; Graf, Frank; Springman, Sarah M. (2019)
    Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
    Both above- and below-ground biomass of plants provide additional strength to soil through different mechanisms, which help to increase the stability of a vegetated slope. Nonetheless, shallow landslides on steep slopes covered with vegetation still occur, often being triggered above the groundwater table, due to loss of suction subsequent to rainfall. Therefore, it is essential to know to what extent vegetation enhances slope stability, and to quantify the contribution of vegetation to the shear strength of soil to determine factors of safety. Results of large-scale direct shear experiments on root-permeated soils and slope geometry from a landslide database were synthesised through an infinite slope analysis under partially saturated conditions to find critical combinations of slope angle and suction stress. Monte Carlo simulations yielded a clear separation of stable and unstable zones, which can be used to define the susceptibility of a slope to near surface failure. This method, based on the simulations, has the potential to be used as a regional early warning system.
  • Assessment of plant-induced suction and its effects on the shear strength of rooted soils
    Item type: Journal Article
    Yildiz, Anil; Graf, Frank; Rickli, Christian; et al. (2019)
    Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
    Shallow landslides, either on bare or vegetated slopes, can be triggered after a rainfall event due to loss of suction. An extensive laboratory programme was performed in this study to assess the relationships between water content, plant-induced suction, root biomass and shear strength parameters. Root-permeated soils, planted with combinations of different species, were tested in an inclinable large-scale direct shear apparatus. The effects of mycorrhizal fungi were also investigated with inoculated specimens. The results suggested that the root biomass, as well as root/shoot ratio, was an indicator of plant-induced suction and shear strength of root-permeated soils tested under laboratory conditions. Longer plant growth duration and more species yielded higher mean values of matric suction and normalised shear stress. Mycorrhizal fungi were found to be beneficial in improving the plant functions related to water uptake.
  • Prestressing of soil and structures due to jet grouting
    Item type: Journal Article
    Rabaiotti, Carlo; Malecki, Cornelia; Amstad, Mathias; et al. (2015)
    Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
  • Discussion: Bridge distress caused by approach embankment settlement
    Item type: Journal Article
    Kelesoglu, M. K.; Springman, Sarah M. (2009)
    Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
Publications 1 - 6 of 6