2 edition of Structure and hydrocollapse behaviour of loess found in the catalog.
Structure and hydrocollapse behaviour of loess
Albashir Mohammed Assallay
Written in English
Thesis (Ph.D.) - Loughborough University, 1998.
|Statement||by Albashir Mohammed Assallay.|
The individual particles of loess are usually coated with clay, which acts as a cementing agent to maintain the loose structure. This cementation is often not as strong as that in many alluvial soils, so collapse can occur either by wetting under moderate normal stress or by subjecting the soil to higher stresses without wetting it. To investigate the effects of the relative orientation between a sample's principal axes of anisotropy and the principal stress axes on the dynamic behaviour of undisturbed loess, samples with axial inclinations 30° and 90° relative to the horizontal were : Zhiping Hu, Rui Wang, Yuhe Zhang, Xueni Wei, Qiang Wang.
Problematic soils are those that make the construction of structures extremely difficult. They include collapsible soils which are widely distributed in North America, Europe, Russia and Asia. They show low dry density and moisture content in all testing schedule due to presence of cementation bonds or loess structure especially at unsaturated state in arid or semi-arid by: 2. Detailed investigation of particle‐size distributions (PSDs) of windblown sediments is an increasingly used approach in assessing loess records of aeolian dust dynamics [e.g., Prins and Vriend, ; Prins et al., ].The grain size of the transported dust is usually associated with .
The loess sediments of this complex genetically fall into the slope type. Only the loess sediments on the hyp-sometrically highest elevations have maintained their pri-mary macroporous structure and are identical in quali-ty and mechanical behavior to the loess of the Zemun plateau. Due to the concurrent activity of Aeolian and. AbstractA collapsible soil is composed essentially of a packing of mineral particles and a set of interparticle bonds holding the system together. Failure requires the bond system to fail and the soil structure to collapse. A natural hazard is presented. The soil structure may collapse inwards (consolidate), as in loess failure, or it may collapse outwards (disperse, disintegrate), as in the Author: Ian Smalley, Samson Ng’ambi.
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Structure and hydrocollapse behaviour of loess Loess has a metastable structure and undergoes structural hydrocollapse when loaded and wetted, leading to subsidence and damage of overlying structures, which presents enormous engineering problems in many countries in the by: 6.
Structure and hydrocollapse behaviour of loess. By Albashir M. Assallay. Download PDF (9 MB) Abstract. A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough has a metastable structure and undergoes structural hydrocollapse\ud when loaded and wetted, leading Author: Albashir M.
Assallay. Enable hand tool. Document Properties. Loess has a metastable structure and undergoes structural hydrocollapse when loaded and wetted, leading to subsidence and damage of overlying structures, which presents enormous engineering problems in many countries in the by: 6.
Loess is a loose, open-structured metastable soil of aeolian origin, predominantly composed of 20–60 µm quartz particles bonded together by clay particles and, in some cases, carbonate compounds. When dry it can withstand high overburden stresses, whilst upon saturation it collapses creating potentially enormous engineering by: 4.
Loess is susceptible to large and sudden volume reduction induced by loading or wetting. The work in this paper focused on compression and collapse behaviour of the intact loess under isotropic stress condition. To this purpose, an improved technique was introduced for the unsaturated triaxial apparatus that was capable of precise injecting know the amounts of water into the specimen, Author: Dengfei Zhang, Jiading Wang, Cunli Chen, Songhe Wang.
A major problem encountered with loess deposits is that of structural collapse when loaded and wetted, the process known as hydrocollapse.
To elucidate this problem it is beneficial to model the soil at a microstructural level. The “Loughborough Loess” has been developed as a Monte Carlo computer-based simulation to model soil by: Hydrocollapse of loess continues to cause major geotechnical problems the world over.
Modelling the behaviour of these soils is still in its early stages. Computer models are often used to model saturated soil behaviour but for collapsing unsaturated loess soils such models are difficult to implement due to the complex nature of collapse.
This chapter provides an introduction to the Engineering Group of the Geological Society of London (EGGS) Working Party book on the engineering geology and geomorphology of glaciated and periglaciated terrains.
A summary of changes in the extent of glacial and periglacial conditions throughout the Quaternary to the present day is provided by: 5. The paper presents a method of Finite Element (FE) modelling of a table top steam turbine support structure on piles for the purpose of dynamic analysis.
The modelling accommodates machine-structure and soil-structure interaction. Loess is a kind of special soil with structure and hydrocollapse behavior; due to the particularity of loess, the deformation regularity of the tunnel in loess shows different characteristics from those in by: 8.
Loess soil layers in semi-arid to arid areas have been deposited through the accumulation of aeolian sediments, resulted in a special metastable and open structure being usually unsaturated in : Hamed Sadeghi.
Loess is typically a kind of soil with metastable structure, which makes loess sensitive to collapse and sliding upon wetting. Such structure has thus profound influence on loess's mechanical behavior. However, there have been arguments about how the metastable structure influences on loess's mechanical behavior and what the mechanism behind by: Influence of structure on the behavior of a saturated clayey loess.
Xu, a M.R. Coop b. a Xi’an Jiaotong University, Xi’anP.R. China; formerly Institute of Geology and Geophysics, Chinese Academy of Sciences, BeijingP.R. China, and City University of Hong Kong. b Cited by: This paper presents a numerical investigation into the macromechanical and micromechanical behavior of unsaturated structural loess under constant stress increment ratio compression using the distinct-element method (DEM).
Loess is typically a kind of clayey silt with a metastable structure composed of interparticle bonding and large voids. Identification and Behavior of Collapsible Soils Introduction Collapsible soils are susceptible to large volumetric strains when they become saturated.
Numerous soil types fall in the general category of collapsible soils, including loess, a well-known aeolian deposit, present throughout most of Indiana. Loess is characterized by relatively low. Loess is a relatively simple soil in which the structure is dominated by mm quartz particles of a aspect ratio, giving blade shaped particles (Assallay et al., ).
The major geotechnical problem is that this structure collapses when loaded and wetted; a hydroconsolidation process causing subsidence and possible damage. Hydrocollapse of Semi-arid Soils They include collapsible soils which are widely distributed in North America, Europe, Russia and Asia.
They show low dry density and moisture content in all testing schedule due to presence of cementation bonds or loess structure especially at unsaturated state in arid or semi-arid regions. Effects of soil structure on the shear behaviour of an unsaturated loess at different suctions and temperatures.
C.W.W. Ng, Q.Y. Mu, C. Zhou. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong by: Pore pressure behavior in the high embankment with volcanic cohesive soil placed horizontal drainage Miyata, Y.
/ Kogure, K. / Tanizawa, F. / Ogasawara, K. | print version. grains of natural structure of (a) yellow loess and (b) grey loess. 86 M.S.
Nouaouria et al. / Engineering Geology 99 () 85 – 90 materials with particular reference to their response to.deposition of the loess,the climatic and environmental record of the loess,the pedology of the loess. The loess in the loess plateau of China is the main object described in this book,but the loesses in the other parts of the world are also the last 25 years,loess research in China achieved a great.
Behaviour of silt: the engineering characteristics of loess in the UK Authors: I. Jefferson 1. x. I. Jefferson. Search for articles by this author, C.
Tye 1. x. C. Tye. Search for articles by this author the engineering characteristics of loess in the UK I. Jefferson1, C. Tye1, and K.J. Northmore2 1School of Property and Construction.