Stability analysis method of geogrid reinforced expansive soil slopes and its engineering application

et al. 2021

Applied Sciences

Red clay is not easy to use as a natural foundation because of its high water content, high plasticity index, large void ratio, and susceptibility to shrinkage and cracking. In this study, consolidated undrained triaxial tests were conducted to examine the mechanical properties of polypropylene fiber-reinforced red clay and to analyze the influence of the fiber content (FC), fiber length (FL), and cell pressure on its shear strength. By performing a regression analysis on the test data, a hyperbolic constitutive model that considers the influence of FC, FL, and cell pressure was established, and a method was developed to estimate the parameters of the model. The findings show that, in contrast with the nonreinforced red clay, the fiber-reinforced red clay had a stress-strain curve characterized by typical strain hardening, with the shear strength increasing with FC, FL and cell pressure. The calculated results of the model coincide with the test results well, confirming that the hyperbolic model could appropriately describe the stress-strain relationship of polypropylene fiber-reinforced red clay and have reference value for the design and construction of fiber-reinforced red clay foundations.

Section: Introductionmentioning

confidence: 99%

Investigation of the Mechanical Behavior of Polypropylene Fiber-Reinforced Red Clay

et al. 2021

Applied Sciences

“…Ikizler et al [29] designed a rigid steel cubic box (300 mm × 250 mm × 300 mm) with soil pressure transducer attached on the surface of the box, for the measurement of swelling pressures in both lateral and vertical directions under constant volume condition. Zhang et al [30] used an adjustable oedometer ring to measure the lateral swelling pressure and vertical swelling strain under different vertical stress after immersion and lately developed a cubic testing device for the measurement of lateral swelling pressure and its variation with swelling strain subjected to different vertical stress and dry densities [31]. Results of these studies revealed that the lateral pressure increased with the increment of inundated vertical pressure under lateral confined condition [18,32].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Swelling Behavior and Its Anisotropic Evaluation of Unsaturated Expansive Soil

Zhang

Advances in Materials Science and Engineering

et al. 2021

Self Cite

Evaluation of swelling behavior is important for designing structures in expansive soils areas, especially for highway that the swelling pressure generated upon pavement and retaining structures in both vertical and horizontal directions due to infiltration. In this study, modification was made on unsaturated consolidation oedometer to provide synchronized measurement of vertical swelling strain (VSS) and lateral pressure (LP) of expansive soil under constant net normal stress and controlled matric suction. Vertical swelling (VS) test and lateral swelling (LS) test were conducted to investigate the anisotropic swelling behavior. The influence of mean net stress and net stress ratio on VSS was investigated, and the anisotropic swelling behavior of unsaturated expansive soil was characterized using anisotropic swelling ratio. The results show that the VSS nonlinearly decreased as the mean net stress increased and increased as the net stress ratio increased. The expansive soil would rapidly enter the passive state due to lateral swelling pressure under relatively low surcharge, with major principal axis rotating from vertical direction to lateral direction, which advances the possibility of passive failure for light retaining structures. The anisotropic swelling behavior objectively exists and varies with matric suction and net normal stress, which should not be ignored for engineering application.

“…With the development of engineering technology and improvement of material performance, all types of geogrids have gradually occupied an increasingly important position in present engineering construction owing to their excellent material performance advantages [1][2][3][4][5][6][7][8]. The steel-plastic compound geogrid is one of the main representatives, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…advantages [1][2][3][4][5][6][7][8]. The steel-plastic compound geogrid is one of the main representatives, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Tensile Mechanical Properties and Reinforcement Ratio of Steel–Plastic Compound Geogrid-Reinforced Belt

Wang

Song

et al. 2021

Materials

The steel–plastic compound geogrid has been widely used as a new reinforcement material in geotechnical engineering and other fields. Therefore, it is essential to fully understand the mechanical properties of steel–plastic compound geogrid-reinforced belts to utilize steel–plastic compound geogrids efficiently. In this study, tensile mechanical tests of steel wire, polyethylene geogrid belt, and steel–plastic compound geogrid-reinforced belt were conducted with respect to the tensile mechanical properties of steel–plastic compound geogrid-reinforced belts. In addition, the minimum reinforcement and optimal reinforcement ratios of steel–plastic compound geogrid-reinforced belts were summarized. The results showed that the steel–plastic compound geogrid-reinforced belts possessed an incongruent force of the internal steel wire during the tensile process. The tensile stress–strain curve of the steel–plastic compound geogrid-reinforced belt can be divided into the composite adjustment, steel wire breaking, and residual deformation stages. The tensile strength of the steel–plastic compound geogrid-reinforced belt is proportional to the diameter and number of steel wires in the reinforced belt. The minimum and optimum reinforcement ratios of steel wire in the steel–plastic compound geogrid-reinforced belt were 0.63% and 11.92%, respectively.