A Comparative Study on Fracture Characteristics of the Red Sandstone under Water and Nitrogen Gas Fracturing

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Specimen number</td><td class="align_center">Loading rate (MPa/s)</td><td class="align_center">Volumetric strain</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">W1</td><td class="align_center">0.09552</td><td class="align_center">−0.00020</td></tr><tr><td class="align_left">W2</td><td class="align_center">0.07328</td><td class="align_center">−0.00017</td></tr><tr><td class="align_left">W3</td><td class="align_center">0.06368</td><td class="align_center">−0.00018</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The volumetric strain of the specimens under the water fracturing pressure (4 MPa).</div>

Advances in Civil Engineering

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Table 2

Table 2: A Comparative Study on Fracture Characteristics of the Red Sandstone under Water and Nitrogen Gas Fracturing 