Data on Compression Curves

<p>  </p> <p>The provided CSVs contain the raw data used to plot the compression curves in<strong> Figs. 2, 4 and 5</strong>, respectively. These data were extracted from <a href="https://doi.org/10.1520/GTJ14010" target="_blank"><em>Yang et al (2006a)</em></a> (https://doi.org/10.1520/GTJ14010).</p> <p>· <strong>Maximum and Minimum Void Ratios Determination</strong>:</p> <p>1. <strong>ASTM Procedures (D 4253-00, D 4254-00)</strong>: Used for soils with up to 15% soil particles passing sieve No. 200 (0.075 mm) without cohesion.</p> <p>2. <strong>Maximum Void Ratio</strong>: Determined by pouring dry material into a mold using a funnel three times and averaging the void ratios.</p> <p>3. <strong>Minimum Void Ratio</strong>: Determined using both the Standard Proctor test method and vibration method.</p> <p>· <strong>Back Pressure for Saturation</strong>:</p> <p>1. <strong>800 kPa</strong>: To ensure full saturation, achieving B-values exceeding 0.96, often above 0.98 for samples with over 10% fines content.</p> <p><strong>Experimental Condition</strong></p> <p>· <strong>Sample Preparation</strong>:</p> <p>1. <strong>Moist Tamping Under-Compaction Method by Ladd (1978)</strong>: Used to prepare samples to avoid segregation of fines and improve uniformity.</p> <p>· <strong>Triaxial Testing</strong>:</p> <p>1. <strong>Free Ends and Lubricated End Platens</strong>: Used to overcome the barreling effect and concentration of dilation in local zones.</p> <p>2. <strong>Sample Dimensions</strong>: Diameter to height ratio of 1.</p> <p>3. <strong>Types of Tests</strong>:</p> <p>· <u>Static Drained and Undrained Compression Tests:</u> Conducted using closed-loop automatic triaxial test equipment.</p> <p>· <u>B-values:</u> Discussed in detail, with accurate measurements ensured.</p> <p>· <strong>Cyclic Tests: </strong></p> <p>1. <strong>56 Tests</strong>: Conducted using servo pneumatic and mechanical controlled systems.</p> <p><strong>Nomenclature</strong></p> <p><br></p> <ul> <li><strong>SSL (Steady State Line)</strong>: Line representing steady state points at 30% axial strain in drained tests.</li> <li><strong>TFC (Total Fines Content)</strong>: Calculated based on index data, should be between 19% and 36%.</li> <li><strong>IL (Instability Line)</strong>: The line connecting peaks of deviatoric  stresses in undrained compression tests indicates potentially unstable stress states.</li> <li><strong>Peak Stress Ratio</strong>: Ratio between peak deviatoric stress and peak mean effective stress, with or without cohesion.</li> <li><em><strong>c</strong></em>: Cohesion.</li> <li><em><strong>φ</strong></em>: Effective friction angle.</li> <li><em><strong>a</strong></em>: Attraction (<em>a</em> = <em>c</em> / tan <em>φ</em>).</li> <li><strong>Slope of Instability Line (</strong><em><strong>λ</strong></em><strong>)</strong>: Determined from triaxial tests with different stress ranges.</li> <li><strong>Instability Curve</strong>: Relationship between peak stress and void ratios after consolidation.</li> </ul><p></p>