A new technique for high-fidelity cutting technology for hydrate samples

Zhu, Hai; Chen, Jiawang; Ren, Ziqiang; Zhang, Peihao; Gao, Qiaoling; Le, Xiaoling; Xu, Chunying; He, Kai; Zhou, Peng; Gao, Feng; Fang, Yuping

doi:10.1631/jzus.a2100188

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…Note: dε p v denotes increments of plastic volumetric strain; dε p q denotes increments of plastic deviatoric strain; M denotes the stress ratio at the critical state; η denotes the stress ratio (i.e., η q/p); and ξ and χ are two material constants. holding sampling technology can be used to obtain in-situ gassy sediment samples, the sampling cost is high (Bai and Li, 2010;Zhu et al, 2011;Wu et al, 2022;Zhu et al, 2022). Experiments have therefore mainly been carried out using laboratory gassy soil samples.…”

Section: References Dilatancymentioning

confidence: 99%

A Review of Gassy Sediments: Mechanical Property, Disaster Simulation and In-Situ Test

2022

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Gassy sediments are an important cause of engineering disasters such as large-area coastal submarine landslides, excessive tilting of marine foundations, and excessive deformation of tunnels. Under different stress paths, the gassy soil exhibits different microstructure changes and mechanical responses. This paper introduces the current research status regarding the mechanical responses, numerical simulation and the in-situ test methods of gassy sediment. In terms of mechanical responses, it summarized the strength and deformation characteristics of gassy soil under different stress paths, tracking the study on constitutive model. The disaster simulation work using constitutive model of gassy sediment is introduced. It also analyzes the advantages and limitations of various methods in the in-situ test. It can provide theoretical support for further study on disaster prevention and geological risk assessment of gassy sediments.

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Section: References Dilatancymentioning

confidence: 99%

A Review of Gassy Sediments: Mechanical Property, Disaster Simulation and In-Situ Test

2022

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“…This device has been used in four major gas hydrate surveys to quantify gas hydrates and accurately measure sediments containing gas hydrates (Amann et al, 1997;Schultheiss et al, 2006). A pressure-retaining transfer system was developed by Zhejiang University to study natural gas hydrate, which includes a mechanical device for continuous sample transfer, e.g., sample grabbing, sample pushing, sample cutting, sample encapsulation, and small sample transfer (Chen et al, 2019;Zhang et al, 2019;Zhu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Guo

Zhou²,

Ge³

et al. 2022

Front. Mar. Sci.

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Methane leakage at the interface between sediment and overlying seawater is an important basis for gas hydrate exploration. Therefore, a transfer device with working pressure of 30MPa and corresponding scheme are proposed to separate and transfer the sediment and overlying water inside the sampler under the condition of pressure-retaining. Based on the pressure relief valve with adjustable threshold pressure, the device transfers the overlying water by compressing the internal volume and transfers the sediment by secondary sampling. The performance of transfer device is studied by simulation and experiment. Based on the coupled Eulerian-Lagrangian approach in the Abaqus, the secondary sampling was investigated, and the penetration resistance and coring rate of the secondary sampling tube are 141N and 86.2%, respectively. By using the hydraulic simulation software AMESim, the pressure fluctuation caused by the movement of the mechanism during the transfer process was studied, and the pressure fluctuation amplitude is within 0.89 MPa. Furthermore, the laboratory transfer tests were carried out under high pressure conditions, and meantime, the simulation results are verified. Under the working condition of 30MPa, the device can maintain a pressure loss of no more than 8.0% (2.4MPa) within two hours, maintain pressure fluctuations during the transfer process within 4.8% (1.44MPa), and ensure that the pressure in the culture kettle decreases by 4.7% relative to the pressure in the sampler after the transfer, which shows the feasibility of the device application.

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Pressure-retaining sampler for sediment including overlying water based on heavy duty ROV-Jellyfish

Guo

Wang

et al. 2022

Applied Ocean Research

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A new technique for high-fidelity cutting technology for hydrate samples

Cited by 5 publications

References 26 publications

A Review of Gassy Sediments: Mechanical Property, Disaster Simulation and In-Situ Test

A Review of Gassy Sediments: Mechanical Property, Disaster Simulation and In-Situ Test

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Pressure-retaining sampler for sediment including overlying water based on heavy duty ROV-Jellyfish

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