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Foundation analysis and design
01 Jan 1968-
TL;DR: In this paper, Fondation de soutenagement et al. presented a reference record for Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08.
Abstract: Keywords: Fondation ; Mur de soutenement ; Pieux ; Capacite portante ; Ancrage ; Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08
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TL;DR: In this paper, a study was carried out to establish an empirical method to estimate unit skin friction of rigid large-size pneumatic caissons, where the water load, air pressure, and reaction force (contact pressure) were measured accordingly.
Abstract: A study was carried out to establish an empirical method to estimate unit skin friction of rigid large-size pneumatic caissons. Field instrumentation during construction and installation of the rigid pneumatic caissons was in place, where the water load, air pressure, and reaction force (contact pressure) were measured accordingly. Using these data and the weight of caisson, the unit skin friction was estimated. The unit skin friction distribution with depth decreased in a parabolic shape. The unit skin frictions predicted by the K n and λ methods used for deep foundations were compared with the measured data. The comparison showed that the K n method is more suitable for estimating the skin friction of the large-size rigid pneumatic caisson than the λ method in this particular construction project.
2 citations
Cites methods from "Foundation analysis and design"
...The a adhesion factor reported by Tomlinson is classified into three groups according to soil stratum and the penetration ratio of pile (Bowles 1982). b Method Having analyzed existing data and supplemented with additional, more recent tests, a number of organizations proposed that a better…...
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...…penetration ratio of pile (Bowles 1982). b Method Having analyzed existing data and supplemented with additional, more recent tests, a number of organizations proposed that a better correlation of load test and computed pile capacity can be obtained using effective stress parameters (Bowles 1982)....
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16 Jul 2021
TL;DR: In this article, the authors present the seismic behavior of basal geosynthetic-reinforced embankments, and various parameters are analyzed to identify the suitable width of the basal geogrid using time-history analysis.
Abstract: High compressibility and poor shear strength properties of soft clayey foundation soils are problems to be dealt with in the design and construction of embankments or roads. The inclusion of geosynthetic at the embankment base is one of the ground improvement techniques used to construct roads or embankments over soft clayey subsoils. This article aims to present the seismic behaviour of basal geosynthetic-reinforced embankments, and various parameters are analysed to identify the suitable width of basal geogrid using time-history analysis. Embankments of heights 4 to 10 m with varying side slope angles are studied. Analysis of results shows that the addition of basal geogrid not only improves the stability of the embankment under static loading conditions but also improves the seismic performance of the embankment. From the results of this study, it is found that the basal geogrid reinforcement of a total width equal to the embankment base width plus embankment height and with a high tensile modulus of 4000 kN/m is required to effectively withstand the seismic forces in seismic regions with peak ground accelerations up to 0.6 g.
2 citations
TL;DR: In this article, an intensive site investigation including field thermal conductivity tests for six different subsoil strata were performed using a thermal probe method (TLS-100) to systematically understand the effects of field dry density, water content and soil type.
2 citations
01 Jan 2006
TL;DR: In this article, a finite element modeling of peaty clay from Colombo Katunayaka Expressway (CKE) route is considered under two cases: the case of soil with Prefabricated Vertical Drains (PVD) installed for improving the soil, and the case without PVD.
Abstract: This paper is on finite element modelling of peaty clay from Colombo Katunayaka Expressway (CKE) route. Settlement characteristics of the soil is considered under two cases: the case of soil with Prefabricated Vertical Drains (PVD) installed for improving the soil, and the case of soil without PVD. A large-scale model test conducted on CKE peaty clay by stage preloading (Kugan 2003) is re-simulated using axisymmetric finite element analysis. GEOSLOPE software are used to model the long-term consolidation behaviour under the two cases. Equivalent geometry is incorporated and smear resistance of the PVD is taken into account. After setting up the initial stress and pore water pressure as it existed in the test set-up, a coupled analysis is subsequently performed to predict settlement behaviours, excess pore water pressure and Degree of Consolidation (DOC). Modified Cam Clay model is used as the constitutive model, and the reported experimental data are compared with the numerically predicted results. Characteristics of settlement, excess pore water pressure and DOC are discussed in view of stage loading.
2 citations
TL;DR: In this paper, the relationship between coarse-grained content and OMC and MDD of the fill materials of the Province of Aceh in Indonesia has been investigated and two general findings have been deduced: the first finding of the present study shows that the soil OMC decreases when the content of coarse grained particles in the soil increases.
Abstract: Empirical evidence suggests that the percentage of coarse fraction content on soil has an influence on the soil optimum moisture content (OMC) and soil maximum dry density (MDD). This phenomenon is used as a basis to examine the characteristics of Aceh’s fill materials. The major objective of the present study is to determine the relationship between coarse-grained content and OMC and MDD of the Aceh’s fill materials. This relationship is important in the justification of soil suitability as materials for engineering construction. Thirty (30) soil samples from various locations in the Province of Aceh have been collected and tested. The tests carried out include soil physical properties tests and standard compaction test. In the case of a relationship between soil coarse fraction content and soil OMC or MDD, two general findings have been deduced. The first finding of the present study shows that the soil OMC decreases when the content of coarse-grained particles in the soil increases. The later finding shows a positive correlation between coarse particles content and the soil MDD which the increase of the content of coarse-grained particles in the soil will increase the value of the soil’s MDD. In conclusion, the coarse particles content affects the OMC and MDD of Aceh’s fill materials
2 citations
Cites background from "Foundation analysis and design"
...In theory, Proctor (1933) in Bowles (1996), Craig (1997) and Das (1985) stated that the density of soil depends on soil type, the energy of compaction and moisture content....
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...…a testing by compacting soil sample in several different moisture content from which the optimum moisture content and maximum dry unit weight of sample are deduced (Das, 1985; Bowles, 1996; Craig, 1997; Holtz and Kovacs, 1981; Lambe and Whitman, 1979; Sowers, 1979; Whitlow, 1990; STM D1557, 2009)....
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...…illustration, in Figure 1, also indicated that the soils with higher coarse particles content will have lower OMC and higher MDD than soils with low levels of coarse particles (Bowles, 1996; Craig, 1997; Holtz and Kovacs, 1981; Lambe and Whitman, 1979; Sowers, 1979; Whitlow, 1990; McCarthy, 2007)....
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