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soil-strength
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Optimisation of deep mixing technique by artificial neural network based on laboratory and field experiments
, Article Georisk ; Volume 14, Issue 2 , 2020 , Pages 142-157 ; Mojtahedi, S. F. F ; Sadeghi, H ; Sharif University of Technology
Taylor and Francis Ltd
2020
Abstract
Ground improvement techniques are inevitable for weak soils that cannot endure the design load imposed by superstructures. Deep mixing technique (DMT) as one of these methods is promising and effective when a deep soil layer with low bearing capacity is encountered. Such deposits are quite common in the South-west of Iran where the studied site is located. In order to validate the influence of DMT on the enhancement of strength, both in-situ and laboratory tests were conducted. Afterwards, a parametric study was carried out to investigate the influence of key factors including cement content, water–cement ratio, curing time and plasticity index (PI) on the performance of DMT. In summary, a...
Validity of menard relation in dynamic compaction operations
, Article Proceedings of the Institution of Civil Engineers: Ground Improvement ; Volume 162, Issue 1 , 2009 , Pages 37-45 ; 17550750 (ISSN) ; Pak, A ; Shahir, H ; Sharif University of Technology
2009
Abstract
Dynamic compaction (DC) is a common soil improvement technique, used extensively worldwide. DC treatment design is usually based upon empirical relations and past experience. The common problem with all empirical relations is oversimplification of the mechanisms, and the use of parameters that are highly dependent on engineering judgement. In this paper, a developed finite-element code is used for modelling the impact behaviour of dry and moist sandy soil. The code is verified against the results of centrifuge tests. Then the validity of the popular Menard empirical relation for determination of improvement depth in DC design is investigated. The effect of initial relative density, tamper...
The behavior of a limy cemented gravely sand under static loading-case study of Tehran alluvium
, Article Electronic Journal of Geotechnical Engineering ; Volume 13 H , 2008 ; 10893032 (ISSN) ; Seiphoori, A ; Rahmati, A ; Sharif University of Technology
2008
Abstract
The majority of the city of Tehran, Iran has been developed on cemented coarse-grained alluvium. In order to understand the mechanical behavior of this soil, a series of triaxial compression tests (CD, CU) were performed on uncemented and artificially cemented samples. Hydrated lime was used as the cementation agent for sample preparation to model the Tehran cemented deposit. The tests were performed on artificially cemented samples after an appropriate curing time. The effect of confining pressure, cement content and fine content is investigated in this research. The tests results show that peak shear strength is followed by strain softening for all cemented samples. Shear strength...