@article{Farzad Habibbeygi_Hamid Nikraz_2018, title={THE EFFECT OF UNLOADING AND RELOADING ON THE COMPRESSION BEHAVIOUR OF RECONSTITUTED CLAYS}, volume={15}, url={https://geomatejournal.com/geomate/article/view/1006}, abstractNote={<p>Oedometer tests were carried out on reconstituted clays to investigate the compressibility of <br>soft clays with high initial water content under repetitive cycles of unloading/reloading. It is necessary to <br>estimate the compression indices under repetitive loadings to predict the settlement of clayey layers. The <br>results indicate that the unloading/reloading loop can be represented by a bi-linear line in a semi-logarithmic <br>plane with three definite slopes (compression indices). Furthermore, the compression indices of unloading <br>and reloading can be estimated using the compression and swell indices with reasonable accuracy. The <br>reloading part can also be defined by two initial and final slopes. The difference in these two aforementioned <br>slopes can be explained by the balance of physico-chemical and mechanical forces. When the consolidation <br>stress is less than the remolded yield stress, the compression behavior is mainly controlled by the <br>physicochemical effect. In fact, the change in the clay micro-structure is small; however, for stresses greater <br>than remolded yield stress, the soil structure demolishes and the clay microstructure is completely affected. <br>Consequently, the mechanical force controls the deformation which results in a sharp decrease in the <br>void ratio.</p>}, number={51}, journal={GEOMATE Journal}, author={Farzad Habibbeygi and Hamid Nikraz}, year={2018}, month={May}, pages={53–59} }