Comparisons on liquefaction behavior of saturated coral sand and quartz sand under principal stress rotation

Ma, Weijia; Qin, You; Zhao, Kai; Chen, Guoxing

doi:10.1080/1064119x.2021.1882627

Cited by 15 publications

(2 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the island and reef underground engineering is excavated, it will face the problem of slope stability analysis, especially some high and steep slopes. At the same time, due to the wide distribution of particles in the calcareous sand site formed by hydraulic reclamation, the shear strength of different graded calcareous sand slopes is different (Coop, 1990;Ma et al, 2022), which brings difficulties to the slope stability analysis. Therefore, it is necessary to conduct an in-depth research on the shear characteristics of calcareous sand (Ding et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Study on shear characteristics of calcareous sand with different particle size distribution

Zhang

Luo

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

For the island and reef project formed by filling calcareous sand, the problems of wide particle size distribution (PSD) and complex mechanical properties have to be faced. Therefore, in order to provide basic mechanical parameters for the construction of the island and reef project, triaxial shear tests were carried out on calcareous sands with five different typical PSDs. The results showed that as particle gradation became narrower, the axial strain corresponding to the strain-softening point all showed a decreasing trend and their differences gradually decreased; the confining pressure has a significant impact on the volumetric deformation modulus of calcareous sand with a wide PSD. The cohesion of calcareous sand showed a positive correlation with non-uniformity and curvature coefficients, while the variation of an internal friction angle showed a parabolic law; the internal friction angle also changes in the parabola with the change of fine particle contents. Furthermore, by establishing the PFC3D discrete element model, it was found that the numerical simulation results were in good agreement with the test results, which verifies the feasibility of the numerical simulation and the rationality of the mesoscopic parameter calibration. It was discovered that the wider the particle gradation range, the greater the axial strain corresponding to the critical coordination number; the sample with a narrow gradation interval was more likely to present a rotating displacement field to form a penetrating shear band. This study can provide design parameters for stability analysis of high and steep slopes in calcareous sand sites.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on shear characteristics of calcareous sand with different particle size distribution

Zhang

Luo

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…As the construction site gradually extends to the sea, more and more reclamation projects are being built. Due to the characteristics of high cohesion, large internal friction angle and high residual strength, coral sand has become a good blowing filler and is widely used in island and reef engineering (Wang et al, 2011;Wang et al, 2021); However, due to its engineering characteristics of high porosity, large compressibility, and easy crushing of particles (Coop, 1990;Ma et al, 2022), untreated coral sand foundation often has problems such as large uneven settlement and low foundation bearing capacity (Rittirong et al, 2008), which brings great threats to the engineering construction (Ohno et al, 1999). Therefore, proper foundation treatment measures are suggested be taken.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site

Zhang

Zhao

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

Coral sand foundation formed by hydraulic fill often faces the problem of poor bearing capacity. This paper proposed for the first time to apply CFG pile composite foundation to coral sand sites to verify the feasibility of this scheme and understand its mechanical characteristics. Firstly, taking on-site coral sand as the research object, a pile sand interface shear test was conducted to clarify the mechanism of pile side friction. At the same time, the ultimate bearing capacity of CFG pile and its composite foundation was measured through in-situ static load tests. Then, based on the strength parameters of the pile sand interface revealed by indoor tests, numerical simulations were conducted to analyze the bearing characteristics of CFG piles and their composite foundations. Finally, a method for calculating the vertical bearing capacity of rigid piles in composite foundation considering interface parameters was proposed. The results showed that the bearing capacity characteristic values of single pile and composite foundation meet the design requirements; The interface friction angle and cohesion together increased the ultimate side friction by 64.41%; The load is mainly borne by the pile tip resistance, and the increase of the interface friction angle will make the proportion of the side friction load first increase and then decrease more obviously; The pile soil stress ratio first increased and then tended to stabilize as the interface strength increased. Compared with the field static load test results, the rationality of the calculation method for composite foundation rigid piles was verified. This study may have reference significance for the design and construction of coral sand foundation treatment in offshore island and reef projects.

show abstract

Experimental investigation of cyclic failure mechanism of saturated coral sand under various consolidation conditions

Qin

et al. 2023

Bull Eng Geol Environ

View full text Add to dashboard Cite

Comparisons on liquefaction behavior of saturated coral sand and quartz sand under principal stress rotation

Cited by 15 publications

References 38 publications

Study on shear characteristics of calcareous sand with different particle size distribution

Study on shear characteristics of calcareous sand with different particle size distribution

Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site

Experimental investigation of cyclic failure mechanism of saturated coral sand under various consolidation conditions

Contact Info

Product

Resources

About