何旭涛¹, 张秀峰¹, 舒琪¹, 李世强¹, 宋湦², 彭维龙¹
1.国网浙江省电力有限公司舟山供电公司, 浙江 舟山 316021;2.自然资源部第二海洋研究所, 浙江 杭州 310012

摘要:
为了研究海底麻坑内外土体物理力学特性的差异，以杭州湾口外软土海底发现的大型麻坑为研究对象，分别在麻坑内外进行了4站15 m孔压静力触探（CPTU）测试、2口钻孔共48个柱状样样品的常规土工试验，结果表明麻坑内土体相较麻坑外土体抗剪强度高、压缩模量大，饱和度、孔隙率和含水量低，而浅层气在海底土体中的赋存形式是造成这种差异的主要原因。
关键词:孔压静力触探(CPTU)海底麻坑土力学
DOI：10.11759/hykx20190415001
分类号:P751
基金项目:浙江省电力有限公司基金资助项目（5211ZS16000C）；国家自然科学基金项目（5167090521）；中央级公益性科研院所基本科研业务费专项资金项目（SZ1919）

Study on the differences in physical and mechanical properties of soil inside and outside a seabed pockmark
HE Xu-tao¹, ZHANG Xiu-feng¹, SHU Qi¹, LI Shi-qiang¹, SONG Sheng², PENG Wei-long¹
1.Zhoushan Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd., Zhoushan 316021, China;2.Second Institute of Oceanography, Ministry of Natural Resources of the People's Republic of China, Hangzhou 310012, China
Abstract:
To analyze the differences in the physical and mechanical properties of soil inside and outside a pockmark, a 15-m pore pressure cone penetration test at four stations and the borehole column geotechnical test at two stations were conducted. The results showed that the soil phase in the pockmark had a higher shear strength, higher compressive modulus, lower saturation, porosity, and lower water content than those outside the pockmark. The occurrence of shallow gas in the subsea soil was the main reason for this difference.
Key words:pore pressure cone penetration (CPTU)seabed pockmarksoil mechanics





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