The effect of a dragging anchor on a horizontal layer of rockfill

The effect of a dragging anchor on a horizontal layer of rockfill

Crum, S.

Stive, M.J.F. (mentor)
Verhagen, H.J. (mentor)
Van der Schrieck, G.L.M. (mentor)
Krouwel, L. (mentor)
Leung, C.H. (mentor)

Civil Engineering and Geosciences

Hydraulic Engineering

2015-02-10

In the context of the project "Widening of the Juliana Canal" a bottom protection layer is designed by dredging contractor de Vries & Van de Wiel Kust en Oeverwerken. Because part of the channel is embedded in gravel type soil layers and lies above ground water level, a water repellent function of this layer is necessary to prevent seepage.In the proposed design, the water repellent function is provided by a bentonite mat. A layer of rockfill is placed on top of this mat to protect it, among other loads, against damage done by dropping and dragging anchors. Little previous research has been carried to investigate the penetration behaviour of anchors in rockfill. Anchor penetration has mainly been investigated in sand and clay. Because of the significantly different intrinsic properties of rockfill compared those smaller grain sizes, the penetration resistance will likely vary. The available literature on the subject of cutting rockfill was concluded to be insufficient to determine the amount of anchor damage by either drop or drag in the design phase of the bottom protection of the Juliana Canal. To validate the proposed bottom protection, full scale model tests were executed. In this thesis, these field tests will also serve as a method of verification for penetration depth and holding capacity of anchors in different types of rockfill; several models were created and existing models are conformed to comply with the anchor shape. The combination of the prediction of penetration depth formula (Crum (2015)) and the cutting model of Kranendonk (2011) is then likely to give a good approximation for the holding capacity of anchors in different types of rockfill.

anchor
rockfill
cutting model
Juliana Canal
holding capacity
Kranendonk

http://resolver.tudelft.nl/uuid:0f14aa4d-efe5-4c3f-8086-ad876f3e0025

2016-02-10

50.959812, 5.729537

https://doi.org/10.4121/uuid:a6b8b60e-c86a-408c-86d9-2e7815a3446f

http://dx.doi.org/10.4121/uuid:a6b8b60e-c86a-408c-86d9-2e7815a3446f

Student theses

master thesis

(c) 2015 Crum, S.