نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی شیراز، شیراز، ایران
2 گروه مهندسی عمران، واحد شهر کرد، دانشگاه آزاد اسلامی، شهر کرد، ایران
3 عضو اصلی کمیسیون تخصصی ژئوتکنیک، سازمان نظام مهندسی ساختمان
4 دانشکده مهندسی و معماری، دانشگاه تریسته، تریسته، ایتالیا
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The paper aimed to determine the undrained bearing capacity of strip footings located on two-layered clayey soil in the vicinity of a geogrid-reinforced slope under the effect of combined loading by applying horizontal(H), vertical(V) and bending moment(M) loads. To this aim, by finite element modeling in ABAQUS and probe and swipe analysis based on the controlled load-displacement method, the failure envelopes and the failure mechanism of the subsoil of strip footings under the effect of combined loadings were determined in V-H, V-M and V-H-M loading spaces. The results obtained in two cases of unreinforced and reinforced slopes with geogrids were compared by performing parametric studies regarding the effect of changes in undrained shear strength ratios of clayey layers (Cu1/Cu2) and the ratio of the thickness of the first clay layer to the width of the strip foundation (H1/B). The results showed that by increase Cu1/Cu2 in V-H loading spaces, the vertical bearing capacity increased, which is caused by the increase in the undrained adhesion of the first layer. Also, in the combined V-H and V-M loadings, in the case where there is only vertical loading, a larger volume of soil failed. The results showed that reinforcing the slope with geogrid increases the vertical and the moment bearing capacity by 31 and 35%, respectively. In general, the findings of this study provide a new insight into the failure mechanism of strip foundations based on two-layered clayey soils in the vicinity of geogrid-reinforced slopes under the effect of combined loads.
کلیدواژه‌ها [English]
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