海洋地质与第四纪地质2017，Vol.37Issue(5)：151-158,8.DOI:10.16562/j.cnki.0256-1492.2017.05.015
神狐海域W18/19站位天然气水合物上覆层不排水抗剪强度预测
UNDRAINED SHEAR STRENGTH ESTIMATION OF THE COVER LAYER OF HYDRATE AT SITE W18/19 OF SHENHU AREA
摘要
Abstract
Undrained shear strength of the cover layer of hydrate is the most important engineering parameter for conductor jetting design,strata settlement and well stability analysis during gas hydrate production test.The piezocone penetration test (CPTU) could provide effective data to understand the vertical change of undrained shear strength from seabed to hydrate bearing layer.In this paper,we conducted CPTU and corresponding laboratory test at site W18/19 of the Shenhu area,northern South China Sea.Based on the data,the estimation method of cone factor was developed to calculate the undrained shear strength.The result shows that the cover layer of hydrate is mainly consist of calcareous clay and the soil strength becomes harder with the increase in depth.The cone factors calculated from total cone tip resistance,effective cone tip resistance and excess pore pressure is 13.8,4.2 and 14.4 respectively.Based on the CPTU data,the developed method was used to calculate the vertical change in undrained shear strength,which increases with depth within the W18/19 cover layer of hydrate.关键词
不排水抗剪强度/孔压静力触探/水合物上覆层/神狐海域/南海北部Key words
undrained shear strength/piezocone penetration test (CPTU)/cover layer of hydrate/Shenhu area/northern South China Sea分类
海洋科学引用本文复制引用
胡高伟,李彦龙,吴能友,陈强,刘昌岭,刘振纹..神狐海域W18/19站位天然气水合物上覆层不排水抗剪强度预测[J].海洋地质与第四纪地质,2017,37(5):151-158,8.基金项目
国家自然科学基金(41606078,41474119) （41606078,41474119）
国家重点研发计划项目(2017YFC0307600) （2017YFC0307600）
中国地质调查项目(121201005000150016) （121201005000150016）
青岛海洋科学与技术国家实验室开放基金项目(QNLM2016ORP0207) （QNLM2016ORP0207）
泰山学者特聘专家项目 （）
