Experimental Study on Mechanical Properties of Gas Hydrate-Bearing Sediments Using Kaolin Clay  

作　　者：李洋辉 宋永臣 于锋 刘卫国 赵佳飞 

机构地区：[1]Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology

出　　处：《China Ocean Engineering》2011年第1期113-122,共10页中国海洋工程（英文版）

基　　金：supported by the National High Technology Research and Development Program of China(863 Program,Grant No. 2006AA09A209);the Major National S&T Program(Grant No. 2008ZX05026-004);the Major State Basic Research Development Program of China(973 Program,Grant No. 2009CB219507);the National Natural Science Foundation of China(Grant No.91010015)

摘　　要：A triaxial system is designed with a temperature range from -20 ℃ to 25℃ and a pressure range from 0 MPa to 30 MPa in order to improve the understanding of the mechanical properties of gas hydrate-bearing sediments. The mechanical properties of synthetic gas hydrate-bearing sediments （gas hydrate-kaolin clay mixture） were measured by using current experimental apparatus. The results indicate that： （1） the failure strength of gas hydrate-bearing sediments strongly depends on the temperature. The sediment＇s strength increases with the decreases of temperature. （2） The maximum deviator stress increases linearly with the confining pressure at a low-pressure stage. However, it fluctuates at a high-pressure stage. （3） Maximum deviator stress increases with increasing strain rate, whereas the strain-stress curve has no tremendous change until the axial strain reaches approximately 0.5%. （4） The internal friction angles of gas hydrate-bearing sediments are not sensitive to kaolin volume ratio. The cohesion shows a high kaolin volume ratio dependency.A triaxial system is designed with a temperature range from -20 ℃ to 25℃ and a pressure range from 0 MPa to 30 MPa in order to improve the understanding of the mechanical properties of gas hydrate-bearing sediments. The mechanical properties of synthetic gas hydrate-bearing sediments （gas hydrate-kaolin clay mixture） were measured by using current experimental apparatus. The results indicate that： （1） the failure strength of gas hydrate-bearing sediments strongly depends on the temperature. The sediment＇s strength increases with the decreases of temperature. （2） The maximum deviator stress increases linearly with the confining pressure at a low-pressure stage. However, it fluctuates at a high-pressure stage. （3） Maximum deviator stress increases with increasing strain rate, whereas the strain-stress curve has no tremendous change until the axial strain reaches approximately 0.5%. （4） The internal friction angles of gas hydrate-bearing sediments are not sensitive to kaolin volume ratio. The cohesion shows a high kaolin volume ratio dependency.

关 键 词：gas hydrate mechanical properties marine sediment triaxial testing safe extraction 

分 类 号：P744.4[天文地球—海洋科学]