Craig’s Soil Mechanics

Knappett, Jonathan; Craig, R. F.

doi:10.1201/9781351052740

Cited by 77 publications

(111 citation statements)

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“…A new diffuse shear band appears starting from the edge of the plate but inclined towards the axis of symmetry. It forms an approximately conical soil block (referred to hereafter as a 'nearfield zone'), similar to the one forming beneath a shallow footing (Prandtl 1921, Knappett andCraig 2012). The theoretical boundary of this zone (45 o +ϕ/2) is drawn in Figure 3Figure 3 for comparison but does not exactly correspond to numerical results.…”

Section: Modelling Approachmentioning

confidence: 99%

Effect of soil deformability on the failure mechanism of shallow plate or screw anchors in sand

Cerfontaine

Knappett

Brown

et al. 2019

Computers and Geotechnics

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Most analytical approaches for the design of shallow plate and screw anchors in tension are based on the limit equilibrium of a rigid soil wedge for which a horizontal stress distribution acting on the failure plane is assumed. Finite element analysis for a wide range of soil properties was carried out to identify the shape of the failure mechanism and to study the stress distribution at failure. Results show that soil deformation modifies the stress field around the anchor and increases the uplift capacity. A semi-analytical approach is proposed to describe this stress distribution, based on peak friction angle.

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Section: Modelling Approachmentioning

confidence: 99%

Effect of soil deformability on the failure mechanism of shallow plate or screw anchors in sand

Cerfontaine

Knappett

Brown

et al. 2019

Computers and Geotechnics

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“…these two regions. (Single column, 90 mm, fitting image and in colour) A crushed 50 mm cube immediately after the application of confined-DEC.Darcy's empirical law of water movement in a homogenous material[42] can be used to describe the mechanism behind the two distinct regions. When there is no hydraulic gradient in a material over a distance, no water movement will occur.…”

mentioning

confidence: 99%

Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 1. Factorial experimental design

Ziolkowski

2017

Construction and Building Materials

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The utilisation of fly ash is a global concern. Under conditions of mass production and rapid turnover in automated plants, a reduction in the curing duration of alkali-activated fly ash based mixtures is sought-after. An alternative accelerated curing technique, confined-DEC (Direct Electric Curing), with the binding mechanism of NaOH activation of fly ash was investigated for the rapid manufacture of fly ash based bricks. This concept is a potentially viable alternative solution for high-volume fly ash utilisation. The investigation revealed that the confined-DEC technique shows great promise in the rapid accelerated curing of NaOH-activated fly ash based brick mixtures. The best induced design conditions, a mixture consisting of 4.1% NaOH, 9% water and 86.9% fly ash by weight, simultaneously subjected to a confining pressure of 10 MPa and a voltage gradient of 0.8 V/mm, obtained a compressive strength of 11.5 MPa in 7 minutes and the mixture continued to increase in compressive strength after the application of confined-DEC, acquiring a compressive strength *Revised Manuscript of 20.1 MPa at 28 days. The investigation also revealed the limitations of confined-DEC under free drainage conditions.

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“…cost function) satisfying both target reliability requirements in addition to all design requirements. Gravity retaining wall design, adopted from the literature [8,20], is based on Knappett and Craig [33]. A 6 m high concrete gravity retaining wall, as shown in Fig.…”

Section: Illustrative Example: Retaining Wall Designmentioning

confidence: 99%

“…The active force F a , based on Coulomb's earth pressure theory [33] is given as where K a is coulomb's active earth pressure coefficient. Based on Fig.…”

Section: Illustrative Example: Retaining Wall Designmentioning

confidence: 99%

Reliability-based optimization of geotechnical design using a constrained optimization technique

Mahmood

2020

SN Appl. Sci.

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Uncertainty and risk are inherent in geotechnical engineering. Reliability-based optimization (RBO) is a methodology that determines the best design solution according to certain design criteria while explicitly considering the effects of uncertainty. RBO ensures a design that is economical as well as reliable in the presence of uncertainties. This paper suggests a direct method for RBO of geotechnical systems by coupling reliability assessment and cost minimization. RBO is proposed as a double-loop (or nested-loop) constrained optimization problem, with cost optimization of geotechnical system through the outer loop repeatedly calling the inner reliability evaluation loop. First-order reliability method is used to compute the reliability index. An algorithm based on constrained optimization is proposed. MATLAB's constrained optimization function, fmincon, is used in two loops: the outer loop to minimize the cost of geotechnical system, and the inner loop to minimize the reliability index to a target value while satisfying geotechnical design requirements. The proposed method is employed to obtain the optimal design of a gravity retaining wall, and compared with other methods, and found to be robust, accurate and feasible.

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Craig’s Soil Mechanics

Cited by 77 publications

References 0 publications

Effect of soil deformability on the failure mechanism of shallow plate or screw anchors in sand

Effect of soil deformability on the failure mechanism of shallow plate or screw anchors in sand

Confined-Direct Electric Curing of NaOH-activated fly ash based brick mixtures under free drainage conditions: Part 1. Factorial experimental design

Reliability-based optimization of geotechnical design using a constrained optimization technique

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