کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6772904 | 1431819 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Estimation of unsaturated shear strength parameters using easily-available soil properties
ترجمه فارسی عنوان
برآورد پارامترهای مقاومت نامتقارن برشی با استفاده از خواص خاک به راحتی در دسترس است
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
Unsaturated soil shear strength is an important parameter in soil erosion and management. Measurement of unsaturated shear strength at field scale is difficult, time-consuming, and very costly. This study was conducted to investigate the relationship between unsaturated shear strength parameters and soil properties, and to predict the unsaturated shear strength parameters (effective cohesion, c', angle of effective internal friction, Ï' and angle of internal friction related to matric suction, Ïb) using multiple-linear regression (MLR). Direct shear tests were performed at combinations of three normal stresses of 25, 50 and 100âkPa, and four matric suctions of 0, 10, 30 and 50âkPa (i.e., 12 tests per each soil) to determine the shear strength parameters in 14 soils. Soil properties including particle size distribution (sand, silt, and clay percentages or geometric mean diameter, dg and geometric standard deviation, Ïg), organic matter content (OM), calcium carbonate content (CaCO3), compactness indices (bulk density, Ïb and, relative bulk density, Ïb-rel), and mean weight diameter of aggregates (MWDdry, MWDwet), structural stability indices (aggregate stability, AS, stability index, SI and index of crusting, Ic) were determined and used as predictors in MLR models. Strong negative correlations were found between c' and Ï'. The c' positively correlated with clay content. Significant negative correlation was observed between c' and sand fractions and dg. Significant positive correlation was obtained between Ï' and fractions of sand and dg. The Ï' negatively correlated with clay, fine silt content (FSi), MWDdry, and AS. The Ïb had no significant correlation with soil properties, indicating that Ïb is independent of soil properties and basically is affected by matric suction. Clay, coarse sand (CS) and very fine sand (VFS) were applied in the model for predicting c'. Clay had a positive and, CS and VFS had negative effects on c'. Pedotransfer functions (PTFs) using the fine sand (FS) and VFS as predictor could estimate the Ï' accurately, so that they entered to PTFs with positive signs. In addition, the Ïb was predicted by parameter Ic only, so that it had negative effect on Ïb. Overall, better prediction models were developed for Ï' than for c' and Ïb.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil and Tillage Research - Volume 184, December 2018, Pages 118-127
Journal: Soil and Tillage Research - Volume 184, December 2018, Pages 118-127
نویسندگان
Elham Amiri Khaboushan, Hojat Emami, Mohammad Reza Mosaddeghi, Ali Rrza Astaraei,