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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 series of laboratory large-scale model tests were conducted on piled raft founded on sand with different compaction levels, and the effect of load eccentricity was investigated for different conditions.
Abstract: A series of laboratory large-scale model tests were conducted on piled raft founded on sand with different compaction levels. The numbers of piles are 1, 4, 5 and 9. All the piles are 40 cm in length and the slenderness ratio is 20. In these tests, the variation of load improvement ratio (LIR), load-sharing ratio (αp) and settlement ratio (SR) are reported for different relative densities and number of piles. Moreover, the variation of ultimate bearing capacity of piled raft system was investigated for different conditions. Results showed that LIR ratio will be more noticeable in loose state in comparison to dense sand, and also increasing the number of settlement reducing piles proved to decrease the SR values or increasing the SIF values in other words. In the end, a sensitivity analysis was performed to investigate the influence of each parameter in affecting the performance of the piled raft system. Based on the sensitivity analyses, relative density of soil was proven to be the most effective parameter in comparison to the number of piles. Finite element analyses have also been performed using the ABAQUS software. The numerical results from the FEM were first validated with the experimental results and then parametric study was carried out to investigate the effect of load eccentricities. It was shown that the ultimate bearing capacity of the piled raft foundation decreases significantly with an increase in the load eccentricity.
3 citations
TL;DR: In this paper, the elastic coefficients such as Young's modulus, bulk modulus and shear modulus have been assessed based on the estimated seismic wave velocities for near-surface sediments.
Abstract: Near-surface seismic measurements, along with relevant geotechnical methods, have become important techniques for delineating the elastic coefficients and geotechnical parameters of shallow foundations. In the north Jeddah expansion zone, shallow seismic measurements at 76 sites have been carried out to estimate both the P- and S-wave velocities for near-surface sediments. These data have been processed where the results revealed a three-layered ground model that reaches to 30 m depth with varying velocities and thicknesses. Then, the elastic coefficients such as Young’s modulus, bulk modulus, shear modulus, ultimate bearing capacity, and allowable bearing capacity have been assessed based on the estimated seismic wave velocities. It can be concluded that bearing capacity is closely related to shear wave velocity and shear modulus. Comparing our results with the published safe ranges of allowable bearing capacities, it is recommended that the first layer in the western zone as well as the second layer is the most suitable areas for constructing safe engineering foundations in the area of interest. Additionally, the best locations of these foundations can be easily identified from contouring maps.
3 citations
14 Mar 2012
2 citations
TL;DR: In this article, the effects that different supporting conditions have on the lateral response of underground pipeline structures to earthquakes are examined, and important factors that contribute to the response are identified and the relative importance of their effects is assessed.
2 citations
01 Jan 1975
TL;DR: An investigation of the relationship between foundation failures and geologic, soil, and rock conditions, as well as construction prac- tices in Amman, Jordan, has been undertaken.
Abstract: An investigation of the relationship between foundation failures and geologic, soil, and rock conditions, as well as construction prac tices in Amman, Jordan, has been undertaken. Detailed failure intensity, geologic,.and structural contour maps show that failure intensity foci, coincide with local weak geologic struc tures, thick soil sections, and gouge zones and cavernous rock types. Building material, design arid misuse, alkali cement mixes, poor compac tion of sewage sublining refill, and air or ground traffic also have direct effects on foundation failures. Upon consolidation of collected soil samples under the stress of two tons per square foot, fifty-two percent of the samples showed more than 6 percent decrease in volume. Physical properties of the soil samples showed that 42 percent had five positive (out of ten), indicative collapse parameters. For design purposes, limestones are strong, and chert fabrics have to be investigated beforehand. Phosphates and crusts should be removed if weathered, otherwise they should be treated as soils. Sur face and ground water conditions were also studied to investigate the effects of erosion and aquifer depletion on foundation failures. Soil terraces along the wadi courses eroded due to torrential runoffs and peak floods, and the infiltrated rain water causes more problems to the foundations due to soil swelling. Aquifer depletion and the consequent stress increase are dissipated in the massive thick rock beds. . xiv
2 citations
Cites background from "Foundation analysis and design"
...Breazeale and Smith (1930) discussed the formation of caliche in Arizona as a result of calcium carbonate solution, transportation and precipitation by the action of ascending and descending water, and/or plant roots that absorb water leaving CaGO^....
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