scholarly journals Mechanical Properties of Fiber-Reinforced Soil under Triaxial Compression and Parameter Determination Based on the Duncan-Chang Model

2020 ◽  
Vol 10 (24) ◽  
pp. 9043
Author(s):  
Yingying Zhao ◽  
Xianzhang Ling ◽  
Weigong Gong ◽  
Peng Li ◽  
Guoyu Li ◽  
...  
Keyword(s):  
Fiber Length ◽  
Triaxial Compression ◽  
Confining Pressure ◽  
Reinforced Soil ◽  
Fiber Content ◽  
Fiber Reinforced ◽  
Strain Relationship ◽  
Relationship Of ◽  
Chang Model ◽  
Fiber Reinforced Soil

To study the mechanical properties of Y-shaped polypropylene fiber-reinforced subgrade fill, the strength characteristics of fiber-reinforced soil with different fiber contents, fiber lengths, and confining pressures were investigated through triaxial compression tests. The test results showed that fiber reinforcement significantly improved the strength and cohesion of the subgrade fill but had a limited impact on the internal friction angle. The fiber-reinforced soil specimens exhibited a failure pattern of bulging deformation, showing plastic failure characteristics. As the fiber content and length increased, the strength of the fiber-reinforced soil increased and then decreased. The optimal fiber content was 0.2%, and the optimal fiber length was between 12 and 18 mm in all test conditions. The strength of the fiber-reinforced soil increased with increasing confining pressure. An empirical model for predicting the failure strength of fiber-reinforced soil was established by analyzing the relationships between the failure strength of the fiber-reinforced soil and the fiber content, fiber length, and confining pressure. The stress-strain relationship of the fiber-reinforced soil exhibited strain-hardening characteristics and could be approximated by a hyperbolic curve. The Duncan-Chang model could be used to describe the stress-strain relationship of this fiber-reinforced soil. A calculation method to determine the model parameters (initial tangent modulus and ultimate deviator stress) was proposed.

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.

Effective Parameters on Strength of Fibre Reinforced Soil

2012 ◽  
Vol 166-169 ◽  
pp. 1630-1638
Author(s):  
Amin Chegenizadeh ◽  
Hamid Nikraz
Keyword(s):  
Fiber Length ◽  
Natural Fiber ◽  
Reinforced Soil ◽  
Fiber Content ◽  
Fiber Reinforced ◽  
Effective Parameters ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
The Subject

soils and their related behavior has always been the subject of many studies. Recent researches show some interests in investigation of inclusion of randomly distributed fiber in soil. Reinforcing subgarde in pavement systems has always been an issue. This study focuses on effect of fiber inclusion on the strength of subgrade material. Natural fiber and plastic fibre were used for this investigation. Fiber contents and length have been changed during these tests. The fiber percentage varied from 0 % (for unreinforced samples) to 2% and fiber length varied from 10mm to 30mm. UCS tests and compaction tests were carried out to investigate behavior of the composite under different condition. The fiber length and fiber content found to play important rule on the strength of fiber reinforced composite. Furthermore it was observed that ductility of sample increased by fiber inclusion.

scholarly journals Studying Shear Performance of Flax Fiber-Reinforced Clay by Triaxial Test

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Qiang Ma ◽  
Yicong Yang ◽  
Henglin Xiao ◽  
Wenwen Xing
Keyword(s):  
Shear Strength ◽  
Triaxial Test ◽  
Confining Pressure ◽  
Fiber Content ◽  
Flax Fiber ◽  
Triaxial Tests ◽  
Fiber Reinforced ◽  
Shear Performance ◽  
Strain Relationship ◽  
Reinforced Clay

Laboratory triaxial tests were carried out to investigate the reinforcement mechanism, to study the characteristics of flax fiber-reinforced clay, and to discuss the effect on stress-strain relationship and shear strength parameters of flax fiber-reinforced clay in different flax fiber content and different confining pressure. Respectively, the ratio of fiber content to clay by weight is 0.2%, 0.4%, 0.6%, 0.8%, and 1.0%, and the confining pressure is 100 kPa, 200 kPa, and 300 kPa in triaxial test. The test results show that, the shear strength of flax fiber-reinforced clay is greater than that of pure clay. Compared with the pure clay, the shear strength of flax fiber-reinforced clay increased as the cohesion and friction increased; while the increase of the friction is relatively small, the increase of cohesion is large. The shear strength firstly increased and then reduced with the increase of flax fiber content. When the fiber content was 0.8%, the shear strength reached a peak value, and the shear strength reduced with the further increase of fiber content.

scholarly journals Direct Shear Creep Characteristics and Microstructure of Fiber-Reinforced Soil

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hao Tang ◽  
Huahua Li ◽  
Zhao Duan ◽  
Chiyang Liu ◽  
Guannan Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fiber Reinforcement ◽  
Reinforced Soil ◽  
Fiber Content ◽  
Direct Shear ◽  
Fiber Reinforced ◽  
Creep Tests ◽  
Shear Creep ◽  
Before And After ◽  
Fiber Reinforced Soil

Fiber-reinforced soil is an excellent engineering material that has become a focus of research. Most studies focus on the conventional mechanical properties of reinforced soil, such as its tensile, compressive, and shear strength, and rarely study its creep-related mechanical properties. However, when such soil is used as backfill, the creep effect should not be ignored. This study explored the characteristics of creep mechanics in reinforced soil, the fiber-reinforcement mechanism, and the dynamics of microstructures before and after creep tests. Direct shear creep tests were carried out using a direct shear creep tester on soil reinforced with natural palm fibers of equal length (1.5 cm) in different amounts (0%, 0.2%, 0.6%, 1.0%). Microscale tests were carried out on the reinforced soil samples before and after the creep tests by polarized light and scanning electron microscopy. The results show that the fiber reinforcement can restrain the deformation and enhance the long-term strength of soil. However, a nonlinear relationship between the reinforcement effect and fiber content was found, with 0.6% being the optimal content. Palm fibers have rough surfaces, grooves, and independent pore chambers, which increase the effective contact area and interaction with the soil. With increases in fiber content, the fibers interweave to form a nestled network structure, which increases the strength and integrity of the soil. Fiber addition changes the microstructure of the soil pores; the proportion of large pores decreases and that of small pores increases. Under the effect of creep, the pore changes follow the principle of pore homogenization; large pores are destroyed and transformed into small pores, causing the porosity of reinforced soil to decrease faster and be less porous than unreinforced soil. This research can provide technical reference for the engineering application of palm fiber-reinforced soil.

scholarly journals Failure Criteria and Constitutive Relationship of Lightweight Aggregate Concrete under Triaxial Compression

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 507
Author(s):  
Peihuan Ye ◽  
Yuliang Chen ◽  
Zongping Chen ◽  
Jinjun Xu ◽  
Huiqin Wu
Keyword(s):  
Triaxial Compression ◽  
Lightweight Aggregate ◽  
Confining Pressure ◽  
Failure Criteria ◽  
Constitutive Relationship ◽  
Lightweight Aggregate Concrete ◽  
Stress Strain ◽  
Aggregate Concrete ◽  
Stress Theory ◽  
Relationship Of

This paper investigates the compression behavior and failure criteria of lightweight aggregate concrete (LAC) under triaxial loading. A total of 156 specimens were tested for three parameters: concrete strength, lateral confining pressure and aggregate immersion time, and their effects on the failure mode of LAC and the triaxial stress-strain relationship of LAC is studied. The research indicated that, as the lateral constraint of the specimen increases, the failure patterns change from vertical splitting failure to oblique shearing failure and then to indistinct traces of damage. The stress-strain curve of LAC specimens has an obvious stress plateau, and the curve no longer appears downward when the confining pressure exceeds 12 MPa. According to the experimental phenomenon and test data, the failure criterion was examined on the Mohr–Coulomb theory, octahedral shear stress theory and Rendulic plane stress theory, which well reflects the behavior of LAC under triaxial compression. For the convenience of analysis and application, the stress-strain constitutive models of LAC under triaxial compression are recommended, and these models correlate well with the test results.

Plate Load Test on Fiber-Reinforced Soil

2003 ◽  
Vol 129 (10) ◽  
pp. 951-955 ◽  
Author(s):  
Nilo C. Consoli ◽  
Michéle D. T. Casagrande ◽  
Pedro D. M. Prietto ◽  
Anto⁁nio Thomé
Keyword(s):  
Reinforced Soil ◽  
Load Test ◽  
Fiber Reinforced ◽  
Plate Load Test ◽  
Fiber Reinforced Soil
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