Mechanical Characteristics of Gas Hydrate-Bearing Sediments: An Experimental Study from the South China Sea

Author:

Yuan Qingmeng123,Kong Liang3ORCID,Liang Qianyong12,Liang Jinqiang12,Yang Lin12,Dong Yifei12,Wang Zhigang12,Wu Xuemin12ORCID

Affiliation:

1. Guangzhou Marine Geological Survey, Guangzhou 511400, China

2. National Engineering Research Center for Gas Hydrate Exploration and Development, Guangzhou 511400, China

3. School of Science, Qingdao University of Technology, Qingdao 266520, China

Abstract

Clarifying the mechanical characteristics of gas hydrate-bearing sediments (GHBS) from a mechanical perspective is crucial for ensuring the long-term, safe, and efficient extraction of natural gas hydrates. In this study, seabed soft clay from the northern South China Sea was utilized to prepare clayey silt samples, aligning with gradation curves related to hydrate extraction projects in the Shenhu area of the South China Sea. Utilizing the high-pressure low-temperature hydrate triaxial testing system (ETAS), twelve sets of triaxial shear tests were conducted. The results highlight that increases in hydrate saturation and confining pressure significantly enhance GHBS’ strength and stiffness, with more pronounced volume expansion observed during shearing. These tests have elucidated the mechanical responses of GHBS. Subsequently, empirical formulas were developed to characterize their properties under varying conditions. Additionally, based on the experimental data, the micro-mechanisms of GHBS were analyzed, suggesting that hydrates notably contribute to the filling and cementing effects in GHBS, with these effects varying with changes in hydrate saturation and confining pressure. This study contributes to a deeper understanding of the fundamental mechanical properties of GHBS.

Funder

National Natural Science Foundation of China

Marine Geological Survey Program of China Geological Survey

Science and Technology Program of Guangzhou

Guangdong Basic and Applied Basic Research Foundation

Director’s research fund of the Guangzhou Marine Geological Survey

Publisher

MDPI AG

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