Experimental study on the mechanical behaviour of bounded geomaterials under creep and cyclic loading considering effects of instantaneous strain rates

Maqsood, Zain; Koseki, Junichi; Miyashita, Yukika; Xie, Jun; Kyokawa, Hiroyuki

doi:10.1016/j.enggeo.2020.105774

Cited by 30 publications

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The geotechnical tests, that is, the direct shear test and the consolidation test, were conducted on undisturbed loess samples obtained from boreholes, as shown in Figure 7. In order to avoid the influence of the loading rate and other factors on the physical and mechanical parameters of the loess samples [37,38], the geotechnical tests in this paper were mainly based on the "Standards for Geotechnical Testing Method" [39]. The density test adopted the cutting ring method and we conducted two parallel tests with an error of less than 0.03 g/cm 3 in the two test results.…”

Section: Geotechnical Testsmentioning

confidence: 99%

Influence of Loess–Mudstone Strata Structure on Slope Seismic Stability of Loess Plateau in China

Zhang,

Qi,

Zhao

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The widely distributed loess–mudstone strata structure in the Loess Plateau of China is one of the fundamental reasons for the susceptibility and group occurrence of seismic landslides in the area. This study took the loess landslides induced by the Haiyuan earthquake as a case study. Through extensive field investigations, the loess cover thickness, mudstone dip angle, slope height, and slope angle were chosen as the influencing factors. Together with mathematical statistics and geotechnical tests, two models, one of a loess–mudstone slope and the other of a pure loess slope, were constructed. Their seismic stabilities under different slope angles and slope heights were compared to analyze the influence of the underlying mudstone strata on the loess slope seismic stability. Meanwhile, a sensitivity analysis of these strata factors affecting the seismic stability of the loess–mudstone slope was carried out based on the orthogonal test. The results showed that ignoring the underlying mudstone strata would lead to smaller calculation results than the actual situation. The sensitivity influence of the factors on the loess–mudstone slope seismic stability comprised the slope angle, loess cover thickness, slope height, and mudstone dip angle from high to low.

show abstract

Section: Geotechnical Testsmentioning

confidence: 99%

Influence of Loess–Mudstone Strata Structure on Slope Seismic Stability of Loess Plateau in China

Zhang,

Qi,

Zhao

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The load and strain rate-related characteristics of rocks and cemented soils are of great significance for determining their engineering properties. Maqsood [13] conducted unconfined monotonic tests at different strain rates to study the effects of creep and cyclic loading on the mechanical properties of boundary geotechnical materials (i.e., Gypsum Mixed Sand (GMS)) produced in the laboratory. Ojala [14] studied the effect of loading rate on the permeability of porous sandstone by conducting triaxial compression tests at different strain rates and temperatures.…”

Section: Introductionmentioning

confidence: 99%

Inverse Analysis of Strata in Seepage Field Based on Regularization Method and Geostatistics Theory

Zhang,

Dong,

Wang

et al. 2024

Buildings

View full text Add to dashboard Cite

During the construction of underground engineering, the prediction of groundwater distribution and rock body permeability is essential for evaluating the safety of the project and guiding subsequent design and construction. This article proposes an objective function that solves an underdetermined inverse analysis problem based on the least-squares theory and regularization method and uses geostatistics theory and the variogram function to describe the spatial characteristics of the actual engineering system. It also establishes an optimization model of the analysis stratum seepage field and puts forward the method of using on-site test observation data to solve the stratum penetration coefficient. Relying on the foundation pit project of the Lingshanwei Station of Qingdao Metro, the on-site pumping and packer permeability test was conducted for different strata venues in the foundation pit, and the on-site water-head observation value was obtained. Physical detection of the influence area of foundation pit excavation confirms the correctness of the model from the region and verifies the accuracy of the model on the value through the on-site pumping test. Results show that the accuracy of the use of this objective function to solve the underdetermined inverse problem is above 85%, which proves the effectiveness of the method. The stratigraphic geological information obtained by the inverse analysis model provides an important basis for engineering design and security construction.

show abstract

“…Due to the convenience of discrete element software, the effect of loading rate has been investigated from a microscopic perspective [19]. For different materials, the effect of loading rate on the stress-strain of materials is different [20][21][22]. From the perspective of discrete element simulation, the force inside the sample is transferred through contact.…”

Section: Introductionmentioning

confidence: 99%

Discrete Element Simple Shear Test Considering Particle Shape

Zhu,

Li,

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The particle shape has significant effects on the slip and rotation of particles in the shear of geomaterials, which is an important factor in the deformation and strength of geomaterials. This paper employed particle flow code (PFC3D) to simulate the simple shear test, and ellipsoidal particles with different aspect ratios were prepared to study the effects of particle shape on the mechanical behavior and fabric evolution of granular materials under complex stress paths. The numerical results show that the particle shape has a significant effect on the peak strength, dilatancy, non-coaxiality, and other mechanical properties of granular materials. The contact fabric evolves from orthotropy to transverse isotropy under the principal stress axes rotation. This paper will provide a reference for natural granular materials with different shapes in the study of mechanical behavior and the micro-constitutive model.

show abstract

Experimental study on the mechanical behaviour of bounded geomaterials under creep and cyclic loading considering effects of instantaneous strain rates

Cited by 30 publications

References 32 publications

Influence of Loess–Mudstone Strata Structure on Slope Seismic Stability of Loess Plateau in China

Influence of Loess–Mudstone Strata Structure on Slope Seismic Stability of Loess Plateau in China

Inverse Analysis of Strata in Seepage Field Based on Regularization Method and Geostatistics Theory

Discrete Element Simple Shear Test Considering Particle Shape

Contact Info

Product

Resources

About