Curvature and Bending Moments from Inclinometer Data

Ooi, Phillip S. K.; Ramsey, Thomas

doi:10.1061/(asce)1532-3641(2003)3:1(64)

Cited by 26 publications

(13 citation statements)

References 6 publications

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“…(5) generally leads to erratic and unrealistic results. To calculate the bending moment profile more accurately, it is necessary to fit a continuous curve to the displacement profile (i.e., curve-fitting techniques are required) (Ooi and Ramsey 2003). 4ϭ…”

Section: Structural Response Of Drilled Displacement Columnsmentioning

confidence: 99%

“…The piecewise cubic curve-fitting approach fits a cubic polynomial w = Az 3 + Bz 2 + Cz + D (where A, B, C, and D are constants) over a moving window of adjacent data points. In the Supplementary Data section, 1 the five-point data window recommended by Ooi and Ramsey (2003) is shown along with larger data windows (9, 11, and 13 points.) and higher-order polynomial approximations ( Fig.…”

Section: Structural Response Of Drilled Displacement Columnsmentioning

confidence: 99%

“…Engineering judgement is required to obtain an appropriate balance between a profile that is "smoothed" and localized behaviour. The higher order polynomials generally provide a good fit of the displacement profile; however, the bending moment profiles show erratic and unpredictable behaviour at the top and bottom and are not utilized here; Ooi and Ramsey (2003) made a similar recommendation. The 11-point data window is adopted herein as the preferred method based on analysis of the post-construction lateral displacement profile (Fig.…”

Section: Structural Response Of Drilled Displacement Columnsmentioning

confidence: 99%

See 2 more Smart Citations

Geosynthetic reinforced column supported embankments and the role of ground improvement installation effects

King

Bouazza

Gniel³

et al. 2018

Can. Geotech. J.

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For geosynthetic reinforced column supported embankments (GRCSE) supporting a high embankment, lateral forces associated with lateral sliding and embankment stability often govern the acceptability of a given design under serviceability conditions. Frequently, the complex soil–structure–geosynthetic interaction, the size, and the three-dimensional nature of a GRCSE necessitate the use of numerical analysis to assess embankment performance relative to serviceability criteria. However, traditional finite element method techniques used to model serviceability behaviour are limited in their ability to model the geotechnical mechanisms associated with column installation, equilibration, and group installation effects. These installation effects are examined herein based on a GRCSE field case study located in Melbourne, Australia, that has been extensively instrumented. The role that these installation effects have on the performance of the GRCSE is highlighted and the behaviour of the columns supporting the embankment is emphasized. It is shown that cracking of the unreinforced columns supporting the embankment is likely inevitable and that the reduction of lateral resistance provided by the columns should be accounted for in design. The suitability of various numerical approaches currently used in design to model the columns supporting the GRCSE, and the embankment itself, are discussed and recommendations are made.

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Section: Structural Response Of Drilled Displacement Columnsmentioning

confidence: 99%

Section: Structural Response Of Drilled Displacement Columnsmentioning

confidence: 99%

Section: Structural Response Of Drilled Displacement Columnsmentioning

confidence: 99%

See 1 more Smart Citation

Geosynthetic reinforced column supported embankments and the role of ground improvement installation effects

King

Bouazza

Gniel³

et al. 2018

Can. Geotech. J.

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“…The design of anti-slide piles relies on a proper determination of the resultant landslide force. Detailed methods of calculation have been discussed in the literature (Dai et al 2003;Lin and Liao 2006;Nie et al 2004;Ooi and Ramsey 2003;Song et al 2005). However, these methods of calculation are subject to a number of assumptions and may not be able to truly reflect the resultant landslide force.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of drainage tunnel effectiveness in landslide control

et al. 2010

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Infiltration of rainfall into hillslopes is often an important factor in triggering landslides. Using underground water drainage works together with anti-slide piles has been an effective method of landslide control, yet their effectiveness is inadequately discussed in the literature. This paper studies the influence of rainfall on the change in the underground water level beneath a slope by real-time and synchronic monitoring of the rainfall, the underground water level in the boreholes, and the flow rate of the underground drainage tunnel. The effectiveness of the underground drainage tunnel in preventing the rise of the underground water level of the slope is discussed. The researchers also study the deformation behavior of the anti-slide piles by monitoring the lateral displacement of the piles and analyzing the thrust that the anti-slide piles bear by numerical inversion techniques. The results indicate that there is an apparent relationship between the lag in the rising of the underground water level caused by a rainfall and that caused by the immediately previous rainfall. When there is a rainfall accumulation before the occurrence of a heavy rain, this particular heavy rainfall will cause a rapid rise of the underground water level beneath the slope. The monitoring data analysis shows that the flow rate of the underground drainage tunnel increases first, and then the underground water level of the slope rises after a rainfall. In other words, the flow rate of the underground drainage tunnel increases at a rate faster than that of the rise of the underground water level. Hence, the underground drainage tunnel can effectively lower the rise of the underground water level induced by a rainfall. Besides, based on the monitoring data of the lateral displacement of the anti-slide piles and subsequent analysis, the working state of the anti-slide piles is justified. It thus indirectly validates the benefits of using underground drainage tunnel in landslide control.

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“…piecewise curve or global high-order polynomial curve) to represent the measured discrete deflection data points of the shaft (e.g. [2][3][4][5][6]). Then, the fitted deflection function is differentiated two times with respect to pile length to obtain bending moments, three times to obtain shear forces, and four times to obtain soil reactions.…”

Section: Introductionmentioning

confidence: 99%

Interpreting the behavior of laterally loaded drilled shaft from measured deflection data

Yamin

Liang

2009

Num Anal Meth Geomechanics

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SUMMARYThe drilled shafts have been widely used to support lateral loads (active load case) or as a means to stabilize an unstable slope (passive load case) due to their large lateral load resistance and structural capacity for shear and bending moments. However, there is a need to develop an analytical procedure that can use the actual measured deflection data of a drilled shaft subject to either active or passive load case to interpret the soil-drilled shaft interaction behavior. The mathematical formulation and the accompanied numerical procedure based on the principle of superposition were developed in this paper to allow for deducing the relevant soil-drilled shaft interaction behavior under the applied lateral load (i.e. net soil reaction force on the drilled shaft, the shear and bending moment in the shaft) from the measured deflection data. Both compatibility and force equilibrium conditions were utilized in formulating the mathematical equations for common single drilled shaft boundary conditions (free head and fixed bottom). The current application is limited to small deformation to meet the requirement that the drilled shaft responds in a linear elastic range. A total of three theoretical cases, along with two actual field cases, were used to demonstrate the validity of the proposed method and its engineering applications.

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Curvature and Bending Moments from Inclinometer Data

Cited by 26 publications

References 6 publications

Geosynthetic reinforced column supported embankments and the role of ground improvement installation effects

Geosynthetic reinforced column supported embankments and the role of ground improvement installation effects

Evaluation of drainage tunnel effectiveness in landslide control

Interpreting the behavior of laterally loaded drilled shaft from measured deflection data

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