the validity assesment of laboratory shear modolus using in-situ seismic piezocone test results
نویسندگان
چکیده
seismic piezocone device (scptu) together with resonant column and cyclic triaxial test apparatus are employed to measure small strain shear modulus (g0) of carbonate sandy and clayey soils of southern coasts of iran. a large area of southern regions of iran is formed from clay, silt and sand. in this study, maximum shear modulus that is derived from both field (by seismic piezocone) and laboratory (by resonant column and cyclic triaxial) tests on soil samples from the southern region, indicated a meaningful effect of sample disturbance. results show that in laboratory tests, loose samples tend to become denser and therefore exhibit greater stiffness whereas dense samples tend to become looser, showing a reduction in stiffness. according to the results of the present study, there are narrow limits of soils shear moduli for which the laboratory tests and the field measurements yield approximately the same amounts. this limit of shear moduli is about 30-50(mpa) for clay deposits and 70-100 (mpa) for sandy deposits. since the shear moduli of soils in small strains can also be computed from the shear wave velocity, also correlations based on parameters derived from scptu test for shear wave velocity determination of sandy and clayey soils of the studied area are presented. this study shows that shear wave velocity can be related to both corrected tip resistance and total normal stress. the measurements of the damping ratio and shear module, because of a great disturbance of stiff deposits during the sampling process and also due to considerable differences between the laboratory and field results, by the laboratory approaches are not reliable and advised.
منابع مشابه
The Validity Assessment of Laboratory Shear Modulus Using In-Situ Seismic Piezocone Test Results
Seismic piezocone device (SCPTu) together with Resonant Column and Cyclic Triaxial test apparatus are employed to measure small strain shear modulus (G0) of carbonate sandy and clayey soils of southern coasts of Iran. A large area of southern regions of Iran is formed from clay, silt and sand. In this study, maximum shear modulus that is derived from both field (by seismic piezocone) and labora...
متن کاملthe test for adverse selection in life insurance market: the case of mellat insurance company
انتخاب نامساعد یکی از مشکلات اساسی در صنعت بیمه است. که ابتدا در سال 1960، توسط روتشیلد واستیگلیتز مورد بحث ومطالعه قرار گرفت ازآن موقع تاکنون بسیاری از پژوهشگران مدل های مختلفی را برای تجزیه و تحلیل تقاضا برای صنعت بیمه عمر که تماما ناشی از عدم قطعیت در این صنعت میباشد انجام داده اند .وهدف از آن پیدا کردن شرایطی است که تحت آن شرایط انتخاب یا کنار گذاشتن یک بیمه گزار به نفع و یا زیان شرکت بیمه ...
15 صفحه اولThe Choromosomal Assesment of Salt Tolerant Substituted Tritipyrum Using Genomic Fluorescentin situ Hybridization (FISH)
متن کامل
Updating Uncertainties in Soil Shear Strength Parameters with Multivariate In-Situ and Laboratory Test Data
In recent years, geotechnical engineers have paid much attention on reliability-based design. The probability density functions (PDFs) of the uncertain soil parameters are required for the reliability-based design. Once these PDFs are obtained, reliability analysis can be conducted, and reliability-based design can be achieved. Among the soil parameters, soil strengths play important roles in g...
متن کاملthe effect of using critical discourse analytical tools on the improvement of the learners level of critical thinking in reading comprehension
?it is of utmost priority for an experienced teacher to train the mind of the students, and enable them to think critically and correctly. the most important question here is that how to develop such a crucial ability? this study examines a new way to the development of critical thinking utilizing critical discourse analytical tools. to attain this goal, two classes of senior english la...
the relationship between learners critical thinking ability and their performance in the reading sections of the tofel and ielts test
the study reflected in this thesis aims at finding out relationships between critical thinking (ct), and the reading sections of tofel and ielts tests. the study tries to find any relationships between the ct ability of students and their performance on reading tests of tofel and academic ielts. however, no research has ever been conducted to investigate the relationship between ct and the read...
15 صفحه اولمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
international journal of civil engineeringجلد ۸، شماره ۲، صفحات ۱۳۴-۱۴۲
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023