Effects of Relative Humidity During Curing on Small-Strain Modulus of Cement-Treated Silty Sand

2020 ◽  
Author(s):  
Rizki Maretia Novi Barus ◽  
Apiniti Jotisankasa ◽  
Susit Chaiprakaikeow ◽  
Supakij Nontananandh ◽  
Shinya Inazumi ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Small Strain ◽  
Silty Sand ◽  
Strain Modulus

scholarly journals Experimental Investigation on Small-Strain Stiffness of Marine Silty Sand

2020 ◽  
Vol 8 (5) ◽  
pp. 360 ◽  
Author(s):  
Qi Wu ◽  
Qingrui Lu ◽  
Qizhou Guo ◽  
Kai Zhao ◽  
Pen Chen ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Void Ratio ◽  
Reduction Rate ◽  
Confining Pressure ◽  
Small Strain ◽  
Silty Sand ◽  
Bender Element ◽  
Small Strain Stiffness ◽  
Alternative State ◽  
State Index

The significance of small-strain stiffness (Gmax) of saturated composite soils are still of great concern in practice, due to the complex influence of fines on soil fabric. This paper presents an experimental investigation conducted through comprehensive bender element tests on Gmax of marine silty sand. Special attention is paid to the influence of initial effective confining pressure ( σ c 0 ′ ), global void ratio (e) and fines content (FC) on Gmax of a marine silty sand. The results indicate that under otherwise similar conditions, Gmax decreases with decreasing e or FC, but decreases with increasing FC. In addition, the reduction rate of Gmax with e increasing is not sensitive to σ c 0 ′ , but obviously sensitive to changes in FC. The equivalent skeleton void ratio (e*) is introduced as an alternative state index for silty sand with various FC, based on the concept of binary packing material. Remarkably, the Hardin model is modified with the new state index e*, allowing unified characterization of Gmax values for silty sand with various FC, e, and σ c 0 ′ . Independent test data for different silty sand published in the literature calibrate the applicability of this proposed model.

scholarly journals Laboratory study of small-strain behavior of a compacted silty sand

2013 ◽  
Vol 50 (2) ◽  
pp. 179-188 ◽  
Author(s):  
Ana Heitor ◽  
Buddhima Indraratna ◽  
Cholachat Rujikiatkamjorn
Keyword(s):  
Moisture Content ◽  
Structural Changes ◽  
Initial Moisture Content ◽  
Small Strain ◽  
Matric Suction ◽  
Point Of View ◽  
Silty Sand ◽  
Degree Of Saturation ◽  
Compacted Soil ◽  
Strain Behavior

Small-strain behavior is a key indicator for assessing the performance of compacted fills. Compaction conditions, i.e., initial moisture content and applied energy, govern compaction effectiveness and thus, the structure and matric suction of compacted soil. This paper presents an experimental study of the small-strain behavior of compacted silty sand prepared with different compaction conditions. Specimens with varying initial moisture contents and compaction energies were tested with bender elements to determine the small-strain shear modulus (G0), while the post-compaction matric suction was measured using the filter paper method and tensiometer. The experimental data suggest a pronounced relationship between G0 and the degree of saturation (Sr) of the as-compacted soil specimens. X-ray computed tomography (CT) scans were performed to examine structural changes of selected specimens upon compaction. The laboratory results are also examined in light of common end-product specifications, which show that it is beneficial to compact the soil slightly dry of optimum moisture content from the modulus point of view.

Small-Strain and Large-Strain Modulus Measurements with a Consolidation Device

2018 ◽  
Vol 47 (2) ◽  
pp. 20160331 ◽  
Author(s):  
Yi Zhao ◽  
Nabeel S. Mahmood ◽  
Richard A. Coffman
Keyword(s):  
Large Strain ◽  
Small Strain ◽  
Strain Modulus

Small strain behavior of a silty sand in controlled-suction resonant column – torsional shear tests

2002 ◽  
Vol 39 (1) ◽  
pp. 22-31 ◽  
Author(s):  
Claudio Mancuso ◽  
Roberto Vassallo ◽  
Anna d'Onofrio
Keyword(s):  
Shear Stiffness ◽  
Small Strain ◽  
Bulk Water ◽  
Silty Sand ◽  
Resonant Column ◽  
Soil Behavior ◽  
Soil Response ◽  
Strain Behavior ◽  
Torsional Shear ◽  
Constant Suction

An experimental study has been carried out using a new resonant column – torsional shear cell to investigate the small strain behavior of an unsaturated compacted silty sand. The device, recently developed at the Dipartimento di Ingegneria Geotecnica di Napoli (Italy), is fitted for controlled-suction testing using the axis-translation technique. Both optimum and wet of optimum compacted specimens have been tested to analyze the effects of suction and fabric on soil behavior. Shear stiffness measurements have been taken during constant-suction tests. Collected data indicate an S-shaped initial shear stiffness versus suction variation, which can be explained considering the progressive change from a bulk-water regulated soil response to a menisci-water regulated soil response. A model is proposed to account for the observed trend. Results highlight significant effects of suction and fabric on soil behavior.Key words: compacted soil, small strain behavior, shear stiffness, suction, soil fabric.

Sign in / Sign up

Export Citation Format

Share Document