A fully coupled flow deformation model for seismic site response analyses of liquefiable marine sediments

Zhao, Kai; Wang, Qiuzhe; Hu, Zhuang; Li, Zhaoyan; Chen, Guoxing

doi:10.1016/j.oceaneng.2022.111144

Cited by 24 publications

(14 citation statements)

References 23 publications

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“…Experimental results indicate that the compressive strength degradation conforms to parabolic law under combined actions of SA and DW cycles. Similar trends could also be found in previous works [36,[63][64][65][66]. Hence, the λ(n) can be expressed as…”

Section: Establishment Of Life Prediction Model Based On Damage Mecha...supporting

confidence: 86%

“…The increase is mainly owed to refinement effects due to the formation of expansive products in the core of the examples, while the degradation is due to cracking caused by the continuous formation of expansive compounds [61,62]. Similar deterioration behavior of compressive strength has already been reported by several researchers [36,[63][64][65][66]. Additionally, it is evident that the concrete without any mineral admixtures (100% OPC concrete) has the most aggressive influence on the K DRC (i.e., down to 75% of original value after 90 DW cycles).…”

Section: Deterioration Resistance Coefficient Of Concrete With Differ...supporting

confidence: 74%

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Degradation Law and Service Life Prediction Model of Tunnel Lining Concrete Suffered Combined Effects of Sulfate Attack and Drying–Wetting Cycles

Wang

et al. 2022

Materials

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The present study explored the degradation law and service life prediction of tunnel lining concrete with different mineral admixtures under coupled actions of sulfate attack (SA) and drying–wetting (DW) cycles. The deterioration resistance coefficient (DRC) of compressive strength and influence coefficients of sulfate concentration, mineral admixture content, water/binder (w/b) ratio, and curing regime on DRC were studied. After that, a new service life prediction model based on damage mechanics was developed and analyzed. Results show that, by increasing the DW cycles, the DRC first increases and then decreases. DRCs of Ordinary Portland cement (OPC), fly ash (FA), and ground granulated blast-furnace slag (GGBS) concrete linearly decrease with the increase of sulfate concentration, while the silica fume (SF) concrete displays a two-stage process; by increasing the admixture content, the DRCs of FA and GGBS concrete exhibit two distinct stages, while the SF concrete depicts a three-stage process; increasing the w/b ratio linearly decreases the DRC; the DRC of curing regime was sequenced as standard curing (SC) > fog curing (FC) > water curing (WC) > same condition curing (SCC). Based on the experimental results, the service life prediction model is applied and validated. The validation results show that the proposed model can accurately predict the lifetime of concrete with different mix proportions. Furthermore, it is found that the mineral admixture can effectively improve the lifetime of concrete, and the composite mineral admixture is more effective than a single mineral admixture in improving the lifetime of concrete.

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Section: Establishment Of Life Prediction Model Based On Damage Mecha...supporting

confidence: 86%

Section: Deterioration Resistance Coefficient Of Concrete With Differ...supporting

confidence: 74%

Degradation Law and Service Life Prediction Model of Tunnel Lining Concrete Suffered Combined Effects of Sulfate Attack and Drying–Wetting Cycles

Wang

et al. 2022

Materials

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“…However, it should be noted that although this study could provide some reference for the stabilization of dredged soils with high moisture content, there are some limitations, such as the reaction mechanism of cement and steel slag and the representativeness of microstructural evolution [ 33 , 34 ]. The microstructural observation could give more information about the microstructural changes of cement- and steel-slag-stabilized dredged soils at different curing ages but was difficult to interpret how cement and steel slag react [ 22 , 35 , 36 ]. The aluminosilicate minerals in steel slag might react with the secondary product of cement hydration and also might copolymerize in the alkaline environment formed by the cement hydration to generate geopolymer.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Strengthening Mechanism of Dredged Silty Clay Stabilized by Cement and Steel Slag

et al. 2022

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The high moisture content and low strength of dredged soft soils result in significant difficulties in directly reutilizing them in engineering. Improving their mechanical properties effectively and achieving re-utilization with the maximum benefit in engineering is the key to disposing of dredged soils with high moisture content. This study investigated the influences of cement and steel slag ratio, moisture content, the maximum particle size of steel slag, and curing age on the compressive strength of dredged silty clay in a plastic flow state. The performance improvement of dredged silty clay stabilized with cement and steel slag was discussed by comparing to related previous studies. The strengthening mechanism of dredged soils stabilized with cement and steel slag was explored by microstructural observation. The results show that when the ratio of cement to steel slag was 9:6; namely, using steel slag to replace 40% of cement, the strength properties of dredged silty clay stabilized by cement and steel slag could ensure the minimum requirements of the project greater then 100 kPa, and their economics could achieve the best results. The finer the particle size of steel slag was, the better the stabilization effect was. The compressive strength of dredged silty clay stabilized by cement and steel slag with particle sizes of less than 0.075 mm was 1.06 times, 1.10 times, and 1.16 times that of 0.25 mm, 1 mm, and 2 mm and increased linearly over curing ages earlier than 28 days. The compressive strength of dredged silty clay stabilized by cement and steel slag cured for 28 days was 2.44 times, 1.59 times, and 1.36 times that of 3, 7, and 14 days, respectively. The evolution of microstructural characteristics showed that the internal pore sizes of dredged soil decreased the structural compactness increased significantly due to the formation of more calcium silicate hydrate and other agglomerated flocculent gel materials from the further reaction between steel slag and cement hydration products. The results of this study can provide technological parameters for the re-utilization of dredged soil stabilized with cement and steel slag.

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“…For accurate representation of wave transmission through a numerical model, the spatial element size, l, must be smaller than approximately one-tenth to one-eighth of the wavelength associated with the highest frequency component of the input wave, which can be expressed by [25,26]:…”

Section: D and 3d Finite Element Modelingmentioning

confidence: 99%

Seismic Response Analyses of a Large-Span Powerhouse Cavern Considering Rock–Structure Interaction

Wang

Chen

et al. 2022

Applied Sciences

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Underground structures in earthquake-prone zones should be designed to withstand both static overburden pressures and earthquake shocks. This paper presents a case study on a large-span powerhouse cavern. With seismic data selected from past earthquake records, lab and in situ tests of the cavern’s geological and geomechanical conditions were performed to analyze the static and dynamic stability of the cavern through the continuum modeling approach. Performance analyses via both 2D and 3D modeling were carried out under seismic conditions and for selected design ground motions. The dynamic response of the surrounding rock mass and of the reinforcement system was detected. The results obtained will facilitate future stability analyses of large underground caverns constructed in the past on the basis of seismic design analyses and input data from post-earthquake records that were recently made available on the site.

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A fully coupled flow deformation model for seismic site response analyses of liquefiable marine sediments

Cited by 24 publications

References 23 publications

Degradation Law and Service Life Prediction Model of Tunnel Lining Concrete Suffered Combined Effects of Sulfate Attack and Drying–Wetting Cycles

Degradation Law and Service Life Prediction Model of Tunnel Lining Concrete Suffered Combined Effects of Sulfate Attack and Drying–Wetting Cycles

Mechanical Properties and Strengthening Mechanism of Dredged Silty Clay Stabilized by Cement and Steel Slag

Seismic Response Analyses of a Large-Span Powerhouse Cavern Considering Rock–Structure Interaction

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