| Popis: |
In this study, the soft marine silts under a rubble-mound breakwater in Ma-Zu of west Taiwan are adopted as a test sample. The specimens were prepared by a new, remolded method at dry density and consolidated stresses. Tri-axial shear-strength tests were performed to evaluate the pore-water pressure and the shear strength. The test results show that the pore-water pressure increases gradually and is close to the critical values as the axial strain increases. In addition, under isotropic and K0 consolidation, both the c and c' of the soft marine silts were 0 kPa, which means that the silts do not have any shear resistance, just like fluid under a rubble-mound breakwater. Based on the linear-elasticity and the one-dimensional consolidation theory, the model of the settlement and stability was evaluated in SIGMA/W. The results show that the soft marine silts at the breakwater induced a displacement, greatly increasing with the filling rubble-mound loading. The figures and results can be referenced for a stability evaluation of the silt soil deposits under the rubble-mound breakwater. The results are useful for marine silts mechanics and a stability analysis for the planning, design, and related research on near-shore engineering. V pričujoči študiji so obravnavani stisljivi morski melji pod obrežnim valolomom iz gruščnatega nasipa v Ma-Zu-ju na zahodu Tajvana. Preizkušanci so bili pripravljeni z novo metodo, s ponovnim preoblikovanjem vzorcev pri suhi gostoti in konsolidacijskih tlakih. Za določitev pornih vodnih tlakov in parametrov strižne trdnosti so bili izvedeni triaksialni preizkusi strižne trdnosti. Rezultati teh preizkusov so pokazali, da porni vodni tlak postopoma raste in je blizu kritičnih vrednosti, ko raste osna specifična deformacija. Razen tega sta bili, pri izotropni in K0 konsolidaciji, obe vrednosti c in c' stisljivih morskih meljev enaki 0 kPa, kar pomeni da melji nimajo nobene strižne trdnosti, torej se obnašajo kot tekočina pod valolomom iz gruščnatega nasipa. Na osnovi linearne elastičnosti in eno dimenzionalne teorije konsolidacije so bili v programskem orodju SIGMA/W preračunani posedki in preverjena stabilnost. Rezultati teh analiz so pokazali, da so stisljivi morski melji pri valolomu sprožili deformacije, ki so se zelo povečale z obtežbo zaradi izdelave gruščnatega nasipa. Slike in rezultati kažejo zveze za vrednotenje stabilnosti meljastih naplavin pod valolomom iz gruščnatega nasipa. Rezultati so uporabni pri mehaniki morskih meljev in stabilnostnih analizah za planiranje, projektiranje in podobne raziskave v inženirstvu obrežij. |
