Book•
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 article, a detailed kinematic analysis of slickenline lineations yields shortening and extension axes consistent with deformation band formation during early Laramide-oriented shortening, and continuing through the folding of Sheep Mountain anticline.
Abstract: Sandstone injectites ranging from 1 km in outcrop length intrude the Cretaceous Mowry Formation in the vicinity of Sheep Mountain anticline (Bighorn Basin, Wyoming, USA). These injectites were sourced from the Peay Sandstone Member of the overlying Cretaceous Frontier Formation and represent a significant possible fluid pathway through impermeable shales. Sand injection occurred along dikes and sills, interacting with bedding discontinuities and preexisting joints in the Mowry Formation during the early folding of Sheep Mountain anticline. We argue that, in contrast to the passive sweeping of sediments into fissures characteristic of Neptunian dike formation, downward intrusion of the Peay sand was forceful and made possible by a highly stratified horizontal stress field resulting from the deposition, burial, and lithification history of the rock units in the area. The internal structure of the injectites is dominated by two sets of mutually offsetting deformation bands. The deformation bands have shear and compaction components, exhibiting significant porosity loss, as well as cataclasis and minor pressure solution. After formation of the deformation bands, subsequent faulting was localized along the margins of deformation bands, evidenced in the field by slickensided surfaces. A detailed kinematic analysis of slickenline lineations yields shortening and extension axes consistent with deformation band formation during early Laramide–oriented shortening, and continuing through the folding of Sheep Mountain anticline. Beyond the formation and deformation of these sandstone injectites, this study highlights the importance of mechanical stratigraphy in the containment of hydraulic fractures.
2 citations
Dissertation•
01 Jan 2008
2 citations
01 Jan 2009
TL;DR: In this article, the effect on the raft foundation of a barrage due to varying stratum has been examined using finite element analysis, where eight noded brick elements have been used for three-dimensional modeling and meshing of the rock, soil, cut-off, pier, beam and abutment but raft foundation has been meshed using plate element.
Abstract: The effect on raft foundation of a barrage due to varying stratum has been examined using finite element analysis. The raft foundation is completely resting on soil media and surrounded by soil and rock media. Eight noded brick elements have been used for three-dimensional modeling and meshing of the rock, soil, cut-off, pier, beam and abutment but raft foundation has been meshed using plate element. The relevant amount of soil and rock around and bottom of the raft foundation has been modeled to simulate the in-situ conditions. The raft foundation of a typical barrage has been analyzed using the representative load cases. Analysis of the barrage raft foundation has been carried out and the influence of soil properties has been studied at the region of transverse sections, which exhibited the response in terms of moments and deformation with significant difference. Index Terms—raft foundation, finite element method, barrage
2 citations
Cites methods from "Foundation analysis and design"
...A number of analytical methods are available for design of raft foundation, viz., conventional method [1], Baker’s method [2] , Hetenyi’s method [3] and numerical methods [4,5]....
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TL;DR: In this article, the authors investigated the factors affecting the performance of permeable groin by an analytical approach supplemented with field observation and found that the depth of the groin is the most critical factor that determines groin stability.
Abstract: The factors affecting the performance of permeable groins are investigated by an analytical approach supplemented with field observation. These factors are broadly divided into three classes: (1) the properties of the soil where the groin is embedded; (2) the flow characteristics of the river channel that are imposed on the groin; and (3) the makeup of the groins. Factors relating to the properties of the soil and flow are then combined into an expression for the factor of safety against failure by overturning. This enables a deterministic sensitivity technique involving partial differentiation of the factor of safety with respect to each contributory factor to be applied. The results obtained show that depth of the groin is the most critical factor that determines groin stability. The depth is followed by flow velocity and discharge, unit weight of water, unit weight of soil, and cohesion. This order of importance agrees with the analysis of observed groin performance in a pilot project at Kaiama in the Niger delta.
2 citations
Cites background or methods from "Foundation analysis and design"
...The lateral earth pressure, on the other hand, is given by Broms (1965) and also by Bowles (1977) :...
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...Each sensitivity coefficient may be normalized using the method suggested by Ramachandran and Hosking (1985) ....
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TL;DR: In this article, an innovative mechanical drilling system (MDS) was developed for the preparation of vertical smooth surface borehole of constant diameter for the pressuremeter testing, which was conducted in boreholes drilled by MDS, rotary rig (RR) and hand auger (HA).
2 citations