Uplift Behavior of Blade-Underreamed Anchors in Silty Sand

Liao, Hung‐Jiun; Hsu, Shih-Tsung

doi:10.1061/(asce)1090-0241(2003)129:6(560)

Cited by 11 publications

(11 citation statements)

References 7 publications

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“…4). These results are also consistent with the studies of several investigators who have shown that the influence of dilation in the sand decreases with an increase in overburden effective stress or confinement ( [19], [23], [31]). …”

Section: Measured and Predicted Bearing Capacity For Embedded Plate Lsupporting

confidence: 93%

Bearing Capacity and Settlement of Footings in Unsaturated Sand

Vanapalli¹

2013

geomate

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ABSTRACT:The focus of the study in this paper is directed towards understanding the influence of three parameters; namely, (i) matric suction, (ii) overburden stress, and (iii) dilation, on the bearing capacity and settlement behavior of surface and embedded model footings in unsaturated sands. The results show that the bearing capacity and settlement behavior of unsaturated sands are significantly influenced by all the three parameters. In addition, comparisons are provided between the predicted and measured bearing capacity and estimated and measured settlement values using the proposed modified Terzaghi's equation and modified Schmertmann's CPT-based method, respectively. There is a good comparison between the predicted/estimated and measured bearing capacity and settlement values for the laboratory and field tests using the proposed modified methods.

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Section: Measured and Predicted Bearing Capacity For Embedded Plate Lsupporting

confidence: 93%

Bearing Capacity and Settlement of Footings in Unsaturated Sand

Vanapalli¹

2013

geomate

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“…As the fixed length of an anchor increases, both the circumferential area and the shear strength of soil around the midpoint of the fixed length increase. Additionally, for anchors with short fixed lengths (L/D < 25), Liao and Hsu (2003) observed that no progressive yield of friction stress was exhibited along the interface between the anchor body and the soil. Hence, as displayed in Fig. 14, the ultimate load increases, concaving upward with the fixed length.…”

Section: Parameter Effects On Anchorage Capacitymentioning

confidence: 95%

“…Liao et al (1996) performed a series of model tests on underreamed anchors, concluding that anchorage capacity increases linearly with the overburden depth. Liao and Hsu (2003) found that, for a straight anchor, if the length/diameter ratio, L/D, exceeds 100, then a progressive yield of friction stress is exhibited between the anchor body and the soil. Su and Fragaszy (1988) defined a shallow or a deep anchor, observing the development of the heave on the ground surface when a shallow anchor was pulled.…”

Section: Introductionmentioning

confidence: 99%

Behavior of pressure-grouted anchors in gravel

HsuShih-Tsung

2012

Can. Geotech. J.

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This study consisted of field tests conducted on nine vertical and three inclined low-pressure-grouted anchors to investigate their behavior in gravel. An anchor can be categorized as a deep anchor when the overburden depth (free length) Z exceeds 8D (D is the diameter of the anchor). The shape of the heave on the ground surface of a shallow anchor is similar to a normal distribution curve. The extended diameter of the heave was between 170 and 300 cm, which could be divided into two zones, primary and secondary, based on the failure mode of the ground. As the fixed length of a shallow anchor increased, the extended diameter also increased. The ultimate load on an anchor increased with the free length and, to a greater degree, with the fixed length of an anchor: a fixed length of only 3 m generated an ultimate load of over 1100 kN. However, the permissible load, determined from the creep coefficient, is inapplicable for short anchors in gravel. The earth pressure coefficient K of vertical anchors was approximately 29 and for an anchor shaft inclined at 25º it was approximately 17.7.

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“…In the recent decades, engineers have generally realized that increasing the diameter of a part of the anchor section is an effective approach for improving the anchor force. Liao [5,6] in Taiwan described a cone-shaped anchor technology, Massarsch [7] developed the Soilexanchor system, Hobst and Zajic [8] reported the blasting anchor method, Cheng [9] produced a type of deep mixing anchor, Park [10] simulated underreamed anchors by pulse discharge technology, Zhu [11] tested a kind of umbrella-shaped anchor, and Liu [12] reported an anticorrosive underreamed anchor with a capsule (see Figure 1). Regarding the theory of underreamed anchors, increasing the diameter of a part of the anchor section can not only improve the friction area between the anchor and corresponding soil but also convert the shaft anchor mechanism into an end bearing mechanism with friction.…”

Section: Introductionmentioning

confidence: 99%

Model Test Research on Bearing Mechanism of Underreamed Ground Anchor in Sand

Guo

Zhong

Tang

et al. 2018

Mathematical Problems in Engineering

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To improve the capacity of ground anchors, scholars and engineers worldwide have developed various types of underreamed anchors with expanded anchor parts. Underreamed anchors have a completely different mechanism from traditional shaft anchors. The expanded section of an underreamed anchor induces an end bearing force to endure the uplift force similar to a reversed pile. Therefore, the total resistance of an underreamed anchor includes friction and end bearing force. To clarify the bearing mechanism of underreamed anchors, a series of model tests were performed using fiber Bragg grating (FBG) sensors and the photogrammetry measuring method. Based on the tests, the distribution and development of the friction and end bearing force of the underreamed anchor model were acquired by the FBG sensors when being pulled out. Moreover, the deformation state of the soil around the anchor model was observed by the digital photogrammetry measuring method. Finally, the interaction mechanism between an underreamed anchor and surrounding sand was obtained, which was identified as the inherent reason for the distribution and development law of the resistance of the underreamed anchor in sand.

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Uplift Behavior of Blade-Underreamed Anchors in Silty Sand

Cited by 11 publications

References 7 publications

Bearing Capacity and Settlement of Footings in Unsaturated Sand

Bearing Capacity and Settlement of Footings in Unsaturated Sand

Behavior of pressure-grouted anchors in gravel

Model Test Research on Bearing Mechanism of Underreamed Ground Anchor in Sand

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