دانلود رایگان مقاله انگلیسی نتیجه نشست فونداسیون سطحی بر روی خاک با دانه های ریز - اشپرینگر 2017

Abstract

Proper estimation of settlement of shallow foundations resting on granular soil deposits has a significant role in the design and construction of buildings and other related structures. While several procedures are available in the literature, discrepancies still exist between the predicted and observed responses. Furthermore, there is a decoupling between bearing capacity and settlement assessment for the same foundation and soil type. This paper presents a new model which was developed to assess load–settlement response up to ultimate soil failure. The model utilizes Mohr–Coulomb criteria coupled with a stress–strain relationship that captures the behavior of granular soil up to large strains. The model has been verified using documented results reported in the literature. Furthermore, two full-scale plate load experiments were recently performed at the University of Nevada, Reno (UNR), utilizing a large soil box 10 ft. (3.048 m) 9 10 ft. (3.048 m) 9 7 ft. (2.134 m). The experiments modeled single-layer and multi-layer soil structure. The load-settlement responses up to bearing capacity failure are reported for both experiments.

Conclusions

A numerical model for shallow foundation load–settlement response up to bearing capacity failure has been presented and calibrated/verified against both bearing capacity and load–settlement response reported in the literature. It is easily programmed in a spreadsheet and can be used for design to assess true bearing capacity or more importantly to develop a curve of predicted load–settlement response, which can be used to define any desired failure criteria. It can likewise be used to develop specific analysis charts or to undertake a sensitivity study of input parameter effects on response. A similar model for undrained soil conditions (i.e., strength Su = c) based on the same principles is also possible. The experiments performed at UNR’s large-scale pavement/soil testing facility show very interesting results, where the testing is continued to ultimate bearing capacity. These experiments will help further verify/calibrate the model at higher load levels once material characterization is complete and fully reported.