The Fracture Characteristic of Three Collinear Cracks under True Triaxial Compression

<table>Relation of critical stress <svg height="12.175" id="M12" style="vertical-align:-3.276pt" version="1.1" viewbox="0 0 16.0625 12.175" width="16.0625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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<g transform="matrix(.012,-0,0,-.012,9.663,12.112)"><path d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" id="x31"></path></g>
</svg> versus the confining stress <svg height="12.325" id="M13" style="vertical-align:-3.39066pt" version="1.1" viewbox="0 0 16.0625 12.325" width="16.0625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg> (<svg height="12.175" id="M14" style="vertical-align:-3.276pt" version="1.1" viewbox="0 0 16.0625 12.175" width="16.0625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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<g transform="matrix(.012,-0,0,-.012,9.663,12.112)"><path d="M412 140l28 -9q0 -2 -35 -131h-373v23q112 112 161 170q59 70 92 127t33 115q0 63 -31 98t-86 35q-75 0 -137 -93l-22 20l57 81q55 59 135 59q69 0 118.5 -46.5t49.5 -122.5q0 -62 -29.5 -114t-102.5 -130l-141 -149h186q42 0 58.5 10.5t38.5 56.5z" id="x32"></path></g>
</svg> is kept as a constant).</table>

The Scientific World Journal

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Figure 4

Figure 4: The Fracture Characteristic of Three Collinear Cracks under True Triaxial Compression 