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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 computer controlled hydraulically driven single degree of freedom shake table was used in these tests and two different slope angles were used in tests with two different types of reinforcement, namely, a woven geotextile and a biaxial geogrid.
Abstract: This paper describes shaking table model studies conducted on unreinforced and reinforced soil slopes. A computer controlled hydraulically driven single degree of freedom shake table was used in these tests. Model soil slopes were constructed using clayey sand (SC) in a laminar box. Two different slope angles were used in tests. Two different types of reinforcement, namely, a woven geotextile and a biaxial geogrid were used in the tests. The models were instrumented with ultrasonic displacement transducers and accelerometers at different locations. The slopes were subjected to horizontal base shaking of known acceleration and frequency and the displacement and acceleration were monitored for time increments. Comparison of displacement and acceleration of tests with different slope angles and with reinforcing layers of different stiffness values resulted in some important observations regarding the response of these soil slopes under seismic shaking conditions. Tensile stiffness of the reinforcemen...
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01 Jan 2013
TL;DR: In this paper, a finite element analysis is proposed using computer program Adina version 8.5 (a finite element code for soil and rock analyses) taking into consideration the soil-structure-interaction.
Abstract: The design of tunnel cross section depends on the values of internal forces and deformations induced in the lining. These values are influenced by many factors such as type of soil, dimensions and shape of the tunnel. In the present study, a finite element analysis is proposed using computer program Adina version 8.5 (A finite element code for soil and rock analyses). A numerical model is presented as a plane strain problem taking into consideration the soil-structure-interaction .Mohr-Coulomb is used to model the nonlinearity of soft clay soil. Two node linear beam element is used to simulate the lining of the different three shape (circular, elliptical, and rectangle with circular arch) twin tunnels. The material of the lining was chosen as a reinforcement concrete. The effect of the change of soft clay soils using different values of the modulus of elasticity (Es) and the Poisson ratio (ν) in the tunnels internal forces and displacement and soil stresses at different case of loading for different shape of tunnels was studied. Also The effect of thickness-radius ratio (t/r) on the tunnels displacement, internal forces and soil stresses was studied .Also the ground surface displacement was studied at different shape and dimensions of different twin tunnels for different soft clay soil properties .The results show that the circular tunnel is best shape of twin tunnels in soft clay soil with different values for (Es) and (ν) . Design charts for the internal forces as well as settlement to predict the maximum bending moments as well as the maximum normal forces induced in the lining have been introduced.
11 citations
Cites methods from "Foundation analysis and design"
...The second part was the soft clay soil, it was studied with different types by varying its modulus of elasticity Es and Poisson ratio μ[22] as shown in table 1....
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TL;DR: In this paper, a rational analysis of extensible sheet reinforcement subjected to an oblique end force has been presented that properly accounts for complex soil-reinforcement interaction and involves stress-deformation relationship implicitly.
Abstract: A rational analysis of extensible sheet reinforcement subjected to an oblique end force has been presented that properly accounts for complex soil-reinforcement interaction and involves stress-deformation relationship implicitly. The results can be used for internal design of geosynthetic reinforced soil walls against pullout failure and tension failure. The pullout force and the end displacement at pullout for an extensible reinforcement are found to be almost the same as those for an inextensible reinforcement if the ratio of the reinforcement stiffness to the axial pullout capacity J* is greater than 15. With decrease in J* below 15, the maximum strain increases, the pullout failure becomes irrelevant, the tension failure dominates and the maximum allowable oblique force decreases. A minimum stiffness of about 25 times the axial pullout capacity is required to avoid the tension failure before the pullout provided the failure strain is 0.1. The predicted results have been calibrated against the finite-element analysis of pullout tests and detailed back analyses of published test data on model reinforced walls constructed with a wide range of extensible materials. The present analysis gives better predictions of the critical height against the pullout and the tension failure in model reinforced soil walls constructed with extensible reinforcements as compared to that of Rankine's method.
11 citations
08 Feb 2016
11 citations
Cites methods from "Foundation analysis and design"
...For cohesive soils, Bowles (1997) proposes values that are interpolated as a function of soil allowable bearingcapacity (qa):...
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...For cohesive soils, Bowles (1997) proposes values that are interpolated as a function of soil allowable bearingcapacity (qa): ks = ⎧⎪⎨⎪⎩ 1200012000+ if qa ≤ 200kPa100kPa (qa −100kPa) 24000 24000+ (qa −200kPa) if 200kPa < qa ≤ 800kPa (2.11)600 48000 if qa > 800kPa 10 This report is available at no…...
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