The Comparation Study of Strength Properties for Intact Loess and Remolded Loess

2013 ◽  
Vol 838-841 ◽  
pp. 825-828 ◽  
Author(s):  
Kang Feng Yuan ◽  
Long Zhang ◽  
Hua Guo
Keyword(s):  
Water Content ◽  
Shear Test ◽  
Confining Pressure ◽  
Strength Properties ◽  
Stress Strain ◽  
Triaxial Shear Test ◽  
Structure Feature ◽  
The Impact ◽  
Intact Loess

At present, the research is not enough for the correlation of structure and stress-strain characters in domestic.The paper aims how the change of water content and confining pressure influence the stress-strain characters of intact loess and remolded loess by consolidated drained triaxial shear test for the Shanxi loess.The results showed that: the intact loess have structure, and the strength of intact loess is larger than remolded loess in the same condition. With the increasing of water content or confining pressure, the stress-strain of intact loess and remolded loess will tend to coincide and the impact of structure feature for loess strength will weaken.

Mechanical Properties of Bentonite-Sand Mixtures Under Triaxial Stress Condition

1994 ◽  
Vol 353 ◽  
Author(s):  
M. Umedera ◽  
A. Fujiwara ◽  
N. Yasufuku ◽  
M. Hyodo ◽  
H. Murata
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Water Content ◽  
Triaxial Compression ◽  
Confining Pressure ◽  
Strength Properties ◽  
Compression Tests ◽  
Optimum Water Content ◽  
Triaxial Compression Tests ◽  
Optimum Water

AbstractA series of triaxial compression tests is being conducted under the drained condition on bentonite and sand mixtures, known as buffer, in saturated and optimum water content states to clarify the mechanical properties of the buffer.It was found that the mechanical properties of bentonite and sand mixtures are strongly influenced by water and bentonite contents: shear strength in a saturated state is less than that in an optimum water content state; shear strength decreases rapidly with increasing bentonite content. Strength properties are much dependent on confining pressure.

The Effect of Moisture Content on the Loess Physical Properties

2014 ◽  
Vol 1065-1069 ◽  
pp. 81-84 ◽  
Author(s):  
Lin Ma
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Physical Properties ◽  
Water Content ◽  
Confining Pressure ◽  
Factors Affecting ◽  
Intrinsic Mechanism ◽  
Pressure Failure ◽  
Intact Soil ◽  
Intact Loess

Water is one of the most important factors affecting the mechanical properties of soil.Research on the intrinsic mechanism of soil by water effect is significant. In this paper, the mechanical properties of loess in Shanxi under different water content is studied from the experimental angle. The result shows that the stress of intact loess increases with the water content decreasing. Pressure failure stress increases with water content decreasing under the same confining, and amplitude reduction increases.Keywords: moisture content; physical properties; intact soil; confining pressure

scholarly journals Identifying the Impact Factors of the Dynamic Strength of Mudded Intercalations during Cyclic Loading

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Changbin Yan ◽  
Xiao Xu ◽  
Lei Huang
Keyword(s):  
Water Content ◽  
Mineral Composition ◽  
Clay Mineral ◽  
Failure Time ◽  
Dynamic Strength ◽  
Clay Content ◽  
Confining Pressure ◽  
Impact Factors ◽  
The Impact ◽  
Clay Mineral Composition

Despite reports on previous research associated with the dynamic strength of mudded intercalations during cyclic loading, a systematic investigation of the impact factors of this strength is still valuable. This work aimed at experimentally revealing the impact factors of the strength along with their impacts. The potential impact factors considered in this work include (i) water content, (ii) clay mineral composition, (iii) clay content, (iv) confining pressure, and (v) cyclic failure time. Specimens of mudded intercalations were collected from China and were remolded and prepared for a dynamic triaxial test under cyclic loads. The test results showed that the dynamic strength is impacted by water content (strongly), clay mineral composition (moderately), confining pressure (moderately), and cyclic failure time (weakly); no significant impact of clay content was detected. Moreover, the dynamic cohesion is correlated with clay mineral composition (strongly), water content (moderately), and cyclic failure time (weakly); no significant correlation with clay content or confining pressure was detected. Finally, the dynamic friction angle is correlated with water content (strongly), clay content (moderately), and cyclic failure time (weakly); no significant correlation with clay mineral composition or confining pressure was detected.

Study on Strength Properties of Reinforced Expensive Soils with Failured Material

2011 ◽  
Vol 99-100 ◽  
pp. 51-54
Author(s):  
Jin Hui Liu ◽  
Wan Tao Ding ◽  
Yu Ping Liu
Keyword(s):  
Confining Pressure ◽  
Strength Properties ◽  
Reinforced Soil ◽  
Strength Index ◽  
Axial Pressure ◽  
Stress Strain ◽  
Flexible Materials ◽  
Strain Relationship ◽  
Relationship Of

Based on the tri-axial tests, the stress-strain relationship and strength properties of reinforced expensive soils are studied to get the relation between the strength index of reinforced soil and that of the corresponding plain soil. According to stress-strain relationship of reinforcement soils under different layers and principle of equivalent confining pressure, strength properties of reinforced expensive soils with failure material were analyzed. Mohr circles of different reinforcement layers were tangent to the same line while reinforcement materials fractured. With the increment of axial pressure, different layers were fractured slowly and Mohr circles extended outward. It showed that the strength of reinforcement soils increased with increasing the layers. And the tri-axial tests showed that strength envelopes of reinforcement soils with layers of flexible materials were approximately parallel. The increment of strength was only affected by increment of cohesion.

scholarly journals The Influence of Segregation Size of Peat and Pre- Consolidation Pressure on the Effective Shear Strength Properties

2018 ◽  
Vol 250 ◽  
pp. 01013
Author(s):  
Norhaliza Wahab ◽  
Mohd Khaidir Abu Talib
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Peat Soil ◽  
Confining Pressure ◽  
Strength Properties ◽  
Triaxial Tests ◽  
Consolidation Pressure ◽  
Sieve Size ◽  
Preconsolidation Pressure ◽  
Fiber Size

The degree of composition for peat soil in geotechnical engineering may affected the shear strength of the peat soil based on their types (sapric, hemic and fabric). The strength was affected by many factors such as its origin, water content, organic matter and arrangement of peat fibric. The aims of this paper was to investigate the influence of segregation peat sizes and preconsolidation pressure on the effective shear strength properties of reconstituted peat 1.000 mm (<RS1.00) and reconstituted peat 2.360 RS2.36). All the reconstituted peat samples were segregated through passing opening sieve size 1.00 mm and 2.36 mm with the aid of water to obtain homogeneous reconstituted peat slurry and were preconsolidated with 50 kPa, 80 kPa and 100 kPa pressure to obtain samples for triaxial tests. The Triaxial Consolidated Undrained Test was selected to test the shear strength properties of the reconstituted peat samples by using confining pressure 25 kPa, 50 kPa and 100 kPa. Both of the effective shear strength properties result such as cohesion and angle of friction obtained recorded <RS2.36 has higher strength than <RS1.00. The main factors that contribute to the differences shear strength value between two size reconstituted peats were segregation of peat size which affected by peat size (fiber size) and also pre-consolidation pressure applied which reduced the voids, water content and also improved the stiffness and strength of the specimen. All specimen and testing was conducted at RECESS, UTHM.

scholarly journals Characterizing the Effect of Water Content on Small-Strain Shear Modulus of Qiantang Silt

2021 ◽  
Vol 9 (12) ◽  
pp. 1363
Author(s):  
Lisha Zhang ◽  
Shimin Zhang ◽  
Xin Liu ◽  
Yinsuo Sun
Keyword(s):  
Shear Modulus ◽  
Water Content ◽  
Confining Pressure ◽  
Small Strain ◽  
Additional Function ◽  
Small Strain Shear Modulus ◽  
Effect Of Water ◽  
Earth Structures ◽  
Resonant Column Device ◽  
The Impact

Due to the impact of natural and artificial influence, such as waves, tides, and artificial dewatering, the small-strain shear modulus of soils may vary with the water content of soil, causing deformation of excavations and other earth structures. The present study used a resonant column device to investigate the effects of water content, void ratio, and confining pressure on the small-strain shear modulus of a silt extracted from an excavation site near Qiantang River in Hangzhou, China. The test results revealed that the effects of the three factors are not coupled and can be characterized by three individual equations. In particular, the small-strain shear modulus decreases with increasing water content under otherwise similar conditions, which can be characterized by a power function. The classical Hardin’s equation is modified to consider the effect of water content by introducing an additional function of water content.

Experimental Study on the Effects of Water Content to Cement Soil

2013 ◽  
Vol 470 ◽  
pp. 1051-1055
Author(s):  
Yong Qin Wen ◽  
Xiang Dong Shen ◽  
Chao Cui ◽  
Ya Ping Cui
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Water Content ◽  
Shear Test ◽  
Soft Soil ◽  
Cement Composite ◽  
Optimum Amount ◽  
Triaxial Shear Test ◽  
Composite Cement ◽  
Cement Soil

With pumice as the additive agent used in cement composite soil.In order to test the strength of the composite cement soil,the triaxial shear test were tested in the lab with different water content (10%,15%,20%,25%), different curing periods (7d,28d,60d),The results show that the strength of the composite cement soil first added,and then reduces. there is an optimum amount 15%.The pumice powder may evidently improve the mechanical properties of soft soil which has the characteristic of rich-water content.

The Large-Scale Direct Shear Test on Gravel Soil with Different Water Content in Badong of Three Gorges Reservoir Region

2011 ◽  
Vol 243-249 ◽  
pp. 2035-2038 ◽  
Author(s):  
Le Hua Wang ◽  
Jia Cheng Wang ◽  
Jian Lin Li
Keyword(s):  
Water Content ◽  
Three Gorges Reservoir ◽  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear ◽  
Cut Slope ◽  
Three Gorges ◽  
Gravel Soil ◽  
The Impact

The high cut slope of reservoir-bank road and city buildings are mostly earth-rock mixture after excavation. The strength behavior of the gravelly soil is important for mechanism of landslide triggering and soil erosion in Badong high cut slope. With the impact of rainfall, the water content of gravel soil increases, and the water table changes, this eventually affects the mechanical properties of gravel soils. Taking high cut slope which formed in the course of relocation in Three Gorges Reservoir as its background, the paper selected the gravel soil of typical high cut slope in Badong new town; and through on-site survey, analysis of geological conditions, indoor large-scale direct shear test, combined with laboratory test results, it discussed the influence of high cut slope gravel soil shear strength parameters by different water content of sample. At the end of this paper, it draws some beneficial conclusions.

Test Study on the Compressive Strength Properties of Compacted Clayey Soil

2016 ◽  
Vol 703 ◽  
pp. 380-385
Author(s):  
Han Bing Liu ◽  
Hu Zhu Zhang ◽  
Jing Wang
Keyword(s):  
Compressive Strength ◽  
Stress State ◽  
Bearing Capacity ◽  
Water Content ◽  
Clayey Soil ◽  
Triaxial Compression ◽  
Quadratic Function ◽  
Confining Pressure ◽  
Strength Properties ◽  
And Function

In order to study the effect of water content, degree of compaction and stress state on bearing capacity of subgrade, the engineering compacted clayey soil was taken as the subject investigated, regulation of compressive strength changing with water content, degree of compaction and confining pressure were analyzed through triaxial compression test, and function relationships between compressive strength and water content, degree of compaction and stress state were fitted based on the test data. Results show that effects of water content, degree of compaction and confining pressure on compressive strength properties of subgrade compacted clayey soil are all remarkably. The compressive strength decreases according to a quadratic function with the increase of water content, as well as increases in accordance with a quadratic function with the increase of the degree of compaction, and increases linearly with the increase of confining pressure. Improving the construction compaction standard properly, adopting the essential lateral confinement measure and keeping a lower water content of the subgrade in service can improve the bearing capacity and stability of the highway subgrade.

Numerical Simulation of SHPB Test for Concrete under Confining Pressure

2014 ◽  
Vol 580-583 ◽  
pp. 3144-3148 ◽  
Author(s):  
Hua Zhang ◽  
Ao Yu Xie ◽  
Yu Wei Gao
Keyword(s):  
Strain Rate ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Properties ◽  
Confining Pressure ◽  
Hopkinson Pressure Bar ◽  
Stress Strain ◽  
Confining Pressures ◽  
Stress States ◽  
Pressure Bar ◽  
The Impact

Using the HJC dynamic constitutive model, the Split Hopkinson Pressure Bar (SHPB) impact test with confining pressure for concrete was simulated in the software ANSYS/LS-DYNA. The confining pressure was simulated by applying constant pressure around the specimen. The triangle velocity wave, which has less diffusion, is used as loader in the simulation. The confining pressures used were 0MPa, 2MPa, 4MPa, 8MPa and 16MPa and the stress-strain curves were presented. The influence of confining pressure on the dynamic properties was analyzed by comparing the stress-strain curves of concrete under different stress states. The strain rate decreases sensitively as long as the confining pressure increases. By debugging the impact velocity, the stress-strain curves under the similar strain rate were obtained, which indicate the toughening and reinforcing effect with the increase of confining pressure.

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