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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, an Artificial Neural Network (ANN) was used on underground blast data from the literature to obtain the peak ground acceleration (PGA), which is used to assess the vulnerability of buildings.
Abstract: Building structures near the mines area are prone to blast-induced ground vibration due to underground blasting. The level of ground vibration typically quantified as Peak Particle Velocity (PPV) is used to assess the vulnerability of the buildings. However, the PPV does not take into account the dynamic characteristics of the structure. To incorporate structural response in the design and assessment process, Artificial Neural Network (ANN) was used on underground blast data from the literature to obtain the Peak Ground Acceleration (PGA). Charge weight ( Q), distance from the blasting point to the monitoring point (D ) and soil's elastic constant ( E) were taken as input to ANN and peak ground acceleration (PGA) was the output. Safe site distance for constructing structures was determined using non-linear time history analysis of structures having periods ranging from short to long duration, incorporating soil flexibility. The main findings highlight the shortcomings of considering PPV as the sole criteria for vulnerability assessment. The structural response such as interstorey drift, and damage level and locations must be taken into account.
5 citations
01 Jan 2006
TL;DR: In this article, the results of plate load tests on gravely soils of Tehran alluvium are evaluated and the correlation between plate load test results and the modulus of subgrade reaction (K s ) and California bearing ratio (CBR) is presented.
Abstract: The modulus of subgrade reaction is a conceptual relationship between soil pressure and deflection that is widely used in the structural analysis of foundation members. It is used for continues footings, mats and various types of piling. In practical and realistic terms, carrying out in-situ plate bearing tests or relating it in someway to intrinsic deformation characteristics of the soil can find 'Ks'. The plate load test is widely used and it fully described in ASTM D1194. Values of 'Ks' may also be assessed by relating them to the intrinsic parameters of the soil such as elastic modulus (E s ) and California bearing ratio (CBR) (Vesic, 1961, Bowels, 1997). 'E s ' can be derived from the results of triaxial tests. An approximate, empirical relationship between the modulus of subgrade reaction (K s ) and California bearing ratio (CBR) are presented. The standard penetration test is currently the most popular and economical means to obtain subsurface information. The SPT results have been used in correlations for unit weight (γ), relative density (Dr), angle of internal friction φ, and undrained compressive strength qu. It has also been used to estimate the bearing capacity of foundations and for estimating the stress-strain modulus 'Es'. In this paper the results of SPT and PLT tests on gravely soils of Tehran alluvium are evaluated. Due to the results obtained the correlation between SPT results (N1) 60 and modulus of subgrade reaction (Ks) are also presented for gravely soils. The complete data base including SPT and PLT test results and graphical correlations will be included in the main version of the paper.
5 citations
03 Feb 1987
TL;DR: In this article, the authors present an intensive review of the state-of-the-art of the loading equipment and instrumentation for the measurement of load and deformation, and make recommendations regarding the most reliable and economical load test methods needed by highway agencies for the design and control of bridge piles.
Abstract: Recommendations regarding the most reliable and economical load test methods needed by highway agencies for the design and control of bridge piles are introduced. The report contains an intensive review of the state-of-the-art of the loading equipment and instrumentation for the measurement of load and deformation. A review of the state-of-the-art of dynamic measurements and their potential uses is included. Recommendations are made concerning the necessary equipment and the associated costs. The phenomenon of residual stresses due to pile driving is discussed in detail. A simple approach was developed for the prediction of such stresses to make better predictions of pile capacity and to facilitate better interpretation of load results. A computer program, named PPILENF, was developed for the purpose of predicting additional pile loads due to negative skin friction. A complete user's manual is given including several illustrative examples.
5 citations
01 Jan 2014
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5 citations
TL;DR: In this article, the effect of retaining wall roughness on the distribution of lateral pressure was explored with the aid of numerical modeling that is based on the finite element method and the selected constitutive model for this research is the Mohr-Coulomb model.
Abstract: Construction work in many instances requires ground excavation with either vertical or near-vertical face. In such situation, the excavation should be supported by temporary or permanent retaining braced system. The aim of the retain- ing system is to limit the ground settlement, which affects the lateral pressure acting on the retaining system. The lateral earth pressure on deep excavations used in design is determined from apparent pressure diagrams. These diagrams were established on field measurements from retaining systems that keep pace with neither current techniques nor work specifications nor wall types. The parametric studies were accomplished with the aid of numerical modeling that is based on the finite element method. The selected constitutive model for this research is the Mohr-Coulomb model. This parametric study was performed to explore the effect of retaining wall roughness on the distribution of lateral pressure. The results of numerical modeling gen- erally conform to the classical design approaches using the apparent pressure diagrams that were developed by Peck (1969) and Tschebotarioff (1973). Finally, some practical recommendations are offered for geotechnical design of supported deep excavations.
5 citations