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
Citations
More filters
01 Jan 2006
Abstract: Since the early of pile static formula suggested by Meyerhof (1956) up until now, several pile design method is being proposed. Between one method and another, result differences are still questionable. This study is conducted base on driven pile 300 mm diameter spun pile constructed in Malaysia on sand or fine soil. This is to determine the differences between several pile design methods by Meyerhof (1976), Janbu (1976), Vesic (1977), Coyle and Castello (1981), ?? method (1985) and ?? method (1972) with the End-bearing capacity and Skin Resistance capacity value from dynamic load test using Pile Driving Analyzer (PDA). All the design method is also analyzed by using soil friction angle correlation by Schmertmann (1975), Peck, Hanson and Thornburn (1974) and Hatanaka and Uchida (1996). From analysis it can be found that Meyerhof, Coyle and Castello, and ?? method are the most conservative which its value lower or almost near the PDA value. Then follow by Janbu method and ?? method which its value almost near PDA or slightly above it. Vesic method is found to be very unconservative which it value well above PDA value. From this study it can be conclude that it is recommended to use either Meyerhof or Janbu Method for estimating end-bearing capacity in sand and silt. For skin resistance in sand it recommended using Meyerhof method. Finally for estimating skin resistance in clayed soil it is recommended to use ?? method.
TL;DR: In this paper, a load transfer curve for dynamic skin friction was analyzed and the shape of vertical displacement with time was shown to have a more distinct shape of wave as the bias weight increases.
Abstract: Technique for analyzing pile installed by vibratory pile driver was developed and results of analysis obtained from variation of bias weight were studied. It can be seen from load transfer curve for dynamic skin friction that load transfer curve shift to downward as bias weight increases. Shape of load transfer curve for dynamic skin friction becomes closer to shape of coil as the bias weight decreases. Magnitudes of toe resistances were not affected by the bias weight. Shape of load transfer curve for dynamic toe resistance shows the similar tendency as the load transfer curve for skin friction exhibits. Vertical displacement increases as the bias weight increases and the shape of vertical displacement with time shows more distinct shape of wave.
Additional excerpts
...본 연구에서는 말뚝의 상하운동에 따른 지반저항력을 수 정 Ramberg-Osgood 모델로 모사하였는데 말뚝의 변위에 따른 동적단위주면마찰력( )과 동적단위선단저항력() 의 재하(reloading) 및 제하(unloading)에 따른 변화양상은 Fig....
[...]
...해석에 적용한 지반자료는 Table 2에 요약하여 나타내었는데 댐핑상수및 수정 Ramberg-Osgood 모델과 관련한 지반자료는 기존의 자료를 참고하여 결정 한 것이다[10,11]....
[...]
...[Table 2] Soil data for analysis Radiation damping : ⋅ , Ramberg-Osgood model : , , , , , , 해석에 적용한 시간 증분량, 는 0.0008694 s 인데 [Fig....
[...]
01 Jan 2015
TL;DR: In this article, the reaction induced by lateral earth pressure from granular soil contained between two parallel rigid retaining walls when the distance between the two walls is narrow is evaluated and a medium-scale test rig (earth tank) is designed and fabricated.
Abstract: Parallel retaining walls are usually used for jetties, docks and cutoff walls. The lateral earth pressure is a significant design parameter in retaining structures and in number of foundation engineering problems. Retaining walls require quantitative estimate of the lateral pressure for either design or stability analysis. It is known that the distribution of lateral earth pressure against retaining walls is neither triangular nor linear owing to the effect of arching in the backfill. This paper presents experimental evaluation of the reaction induced by lateral earth pressure from granular soil contained between two parallel rigid retaining walls when the distance between the two walls is narrow. A medium-scale test rig (earth tank), in which rigid retaining walls can be tested, is designed and fabricated. Two types of parallel retaining walls are tested in the earth tank: cutoff walls and isolated two parallel walls. The distance between the two parallel walls is varied and the variation in the reactive force exerted on the retaining walls from the lateral earth pressure is presented. Suggestion for the value of optimum clear distance between two parallel retaining walls is presented depending on the reduction in the effective active earth pressure from full active wedge and on the ratio of the at-rest pressure to the active pressure.
Cites background or methods from "Foundation analysis and design"
...Also shown on the same figure, are the usual range of earth pressure coefficients defined by the trigonometric ratios of Equations (3) and (4), [3]....
[...]
...The earth pressure theory proposed by Coulomb, about 1776, is still, however, quoted in standard references on the subject [2], [3], even though it is based on the following simplifying assumptions: i....
[...]
...The above phenomenon, of time-dependent increase in earth pressure, is encountered but briefly in the literature, [3], [11], with scanty notions on its causes and working mechanisms....
[...]
...The resultant earth pressure based on Coulomb theory for cohesionless soil is given by the following equations, [3]:...
[...]
...Rankine, in 1857, considered the soil in a state of plastic equilibrium and used the same assumptions as Coulomb to deduce the earth pressure coefficients Ka and Kp except that he assumed no wall cohesion or wall friction [3], [4]....
[...]
Dissertation•
01 Dec 2011
TL;DR: The aim of this study is to apply the Standard’s approach by means of calculation to the design of earth retaining structures, comparing it with the traditional designing criteria commonly used in Portugal.
Abstract: When compared to the previous Prestandard ENV 1997-1:1994 and also with the traditional method, the Portuguese Standard EN 1997-1:2007 – Eurocode 7 (EC 7) introduces significant changes to the geotechnical design of retaining structures. The aim of this study is to apply the Standard’s approach by means of calculation to the design of earth retaining structures, comparing it with the traditional designing criteria commonly used in Portugal. For this purpose, the following study plan was developed: i) Literature review on the subject; ii) general formularization of the problem of security verification for earth retaining structures, in line with the recommendations of the EC 7; iii) development of an Excel spreadsheet in order to perform the security verification of such kind of structures under the EC 7 guidelines. The Excel spreadsheet was used to compare the differences between the traditional approach and the EC 7 approach by using two examples (a gravity wall and a retaining wall with a T inverted geometry).