Post-cyclic Loading Relationship Effects to the Shear Stress and Cyclic Shear Strain of Peat Soil

سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 23

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شناسه ملی سند علمی:

JR_CEJ-8-12_008

تاریخ نمایه سازی: 2 اردیبهشت 1403

چکیده مقاله:

Peats originate from plants and denote the various stages in the humification process. This condition renders the peat extremely soft and can be considered problematic soil. Thus, this study is conducted to examine and comprehend the particularities of peat engineering behaviour in respect to the relationship effects to the shear stress and cyclic shear strain of peat soil various characteristics to establish suitable correlation. This study carried out by using triaxial testing described by geotechnical test standards BS-۱۳۷۷: Part ۸: ۱۹۹۰. Methods of Testing Soils for Civil Engineering Purposes: Shear Strength Tests (Effective Stress) that required for consolidated undrained and consist of five main stages: saturation, consolidation, static, dynamic, and post-cyclic loading using the GDS Enterprise Level Dynamic Triaxial Testing System (ELDYN). The parameters of shear strength were obtained in the peak deviator stress at a maximum of ۲۰% of axial strain by using an undisturbed sample with an effective pressure imposed of ۲۵, ۵۰, and ۱۰۰ kPa. In this study, all specimens are subjected to cyclic loading up to ۱۰۰ cycles based on a one-way loading system with strain-controlled conditions. Based on the analysis conveyed, the post-cyclic shear stress decreased compared to its initial value of about ۶۵.۵۶ kPa (PNpt-۱۰۰ kPa) in static and decreased to ۱۴.۹۶۱۶ kPa in post-cyclic (PNpt-۲۵ kPa-۱ Hz). The principal stress ratio (σ'۱/σ'۳) shows the maximum values of this ratio that are located in the narrow zone of ۱.۶۱ to ۱.۱۲. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۲-۰۸-۱۲-۰۸ Full Text: PDF

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