Closure to “Reclaimed Lignin-Stabilized Silty Soil: Undrained Shear Strength, Atterberg Limits, and Microstructure Characteristics” by Tao Zhang, Guojun Cai, and Songyu Liu

2020 ◽  
Vol 32 (3) ◽  
pp. 07020002
Author(s):  
Tao Zhang ◽  
Guojun Cai ◽  
Songyu Liu
Keyword(s):  
Shear Strength ◽  
Undrained Shear Strength ◽  
Atterberg Limits ◽  
Microstructure Characteristics ◽  
Silty Soil ◽  
Undrained Shear

Shear strength of remolded soils at consistency limits

2010 ◽  
Vol 47 (3) ◽  
pp. 259-266 ◽  
Author(s):  
Kamil Kayabali ◽  
Osman Oguz Tufenkci
Keyword(s):  
Shear Strength ◽  
Linear Relationship ◽  
Water Content ◽  
Undrained Shear Strength ◽  
Liquid Limit ◽  
Soil Samples ◽  
Atterberg Limits ◽  
Plastic Limit ◽  
Water Contents ◽  
Undrained Shear

The undrained shear strength of remolded soils is of concern in certain geotechnical engineering applications. Several methods for determining this parameter exist, including the laboratory vane test. This study proposes a new method to estimate the undrained shear strength, particularly at the plastic and liquid limits. For 30 inorganic soil samples of different plasticity levels, we determined the Atterberg limits, then performed a series of reverse extrusion tests at different water contents. The plastic and liquid limits are derived from the linear relationship between the logarithm of the extrusion pressure and water content. The tests show that the average undrained shear strength determined from the extrusion pressures at the plastic limit is about 180 kPa, whereas the average undrained shear strength at the liquid limit is 2.3 kPa. We show that the undrained shear strength of remolded soils at any water content can be estimated from the Atterberg limits alone. Although the laboratory vane test provides a reasonable undrained shear strength value at the plastic limit, it overestimates the undrained shear strength at the liquid limit and thus, care must be taken when the laboratory vane test is used to determine undrained shear strengths at water contents near the liquid limit.

IMPROVEMENT OF EXPANSIVE SOIL BY ELECTRO-KINETIC METHOD

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Tran Thi Thanh Thuy ◽  
Doni Prakasa Eka Putra ◽  
Wawan Budianta ◽  
Hemanta Hazarika
Keyword(s):  
Shear Strength ◽  
Calcium Chloride ◽  
Pure Water ◽  
Expansive Soil ◽  
Soil Improvement ◽  
Undrained Shear Strength ◽  
Soil Samples ◽  
Atterberg Limits ◽  
Engineering Properties ◽  
Undrained Shear

The roadway in Karangjati, Ngawi Regency, East Java, Indonesia, which is underlain by expansive soil, is susceptible to damage due to volume change. This research aims to improve the engineering properties, such as consistency limits, compressibility, and undrained shear strength of the montmorillonite dominated soil in this area using an electrokinetic stabilization method. Four electro-kinetic experiments were conducted using different electrolytes (calcium chloride or pure water) under different conditions (no-flow or flow water). The results show that, pH values of all soil samples decreased at anolyte and increased at catholyte. Atterberg limits of the soil samples were found to increase, where the liquid limit (LL) range of 79.72– 86.14%, plastic limit (PL) 25.22–30.80%, and plasticity index (PI) 53.28–60.92, liquidity Index (LI) 0.91–1.08. The compression index Cc was 0.50– 0.742. Undrained shear strength of treated soil range of 7–11 kPa. Moreover, strengthening degree of the treated soils achieve 304–556%. The soil improvement was achieved by decreasing the Atterberg limits, and compressibility and increasing the undrained shear strength. Applying calcium chloride and flow water condition were the most effective methods for the soil improvement. The mineralogical compositions of the soil samples did not change after the treatment. Keywords: Electro-kinetic stabilization, electro chemical injection, clayey soil improvement.

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