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A simple fracture mechanics approach for assessing ductile crack growth in soil

Dep. of Civil Engineering, Univ. of Dundee, Dundee, DD1 4HN, Scotland

View larger version (20K): [in a new window]   Fig. 1. Diagram of a Deep-Notch (3-Point) Bend Specimen used to assess ductile crack growth in soil. The specimen consists of a rectangular test piece of soil with a crack of length a intentionally inserted. Ligament length (b), span distance between rollers (S), and width of test piece (W) are also represented.

View larger version (56K): [in a new window]   Fig. 2. Video images of a 3-point bend test specimen of the 50:50 sand to kaolinite soil being tested. The images show different levels of strain applied by flexing the sample. The numbers on the scale represent 10 mm increments.

View larger version (14K): [in a new window]   Fig. 3. The relationship between the plastic load point displacement, qpl and ligament length, ln(b) for different sand:clay deep-notch bend specimens. The lines are from linear regression analysis and the slopes are used to assess parameters in Eq. [2]. The data shown are from a representative sample for each mix.

View larger version (15K): [in a new window]   Fig. 4. The relationship between the plastic whole crack mouth opening, Vpl, and plastic load-point displacement qpl for the different sand:clay deep-notch bend specimens. The lines are from linear regression analysis and the slopes are used to assess parameters in Eq. [3]. The data shown are from a representative sample for each mix.