摘要
近廿年来,随着海底石油开发事业的迅速发展,为解决海上钻探及钻井平台的稳定性,输油管道和海底电缆的铺设以及某些军事设施和生产建设中提出的许多实际问题,海底沉积物的力学与土工学性质的研究也有了迅速的发展。同时,通过沉积物的力学和土工学性质的研究,特别是它们在沉积地层中各种变化的详细测定,有助于研究和认识沉积-成岩作用的某些机制问题,所以,海底沉积物的力学和土工学性质的研究,不仅在工程上有重要的现实意义,而且对发展沉积学的基础理论也有不容忽视的价值。
Fifteen long sediment cores lifted from water depth of 15 to 29 m in western Bohai Sea were geotechnically analyzed.All samples were undisturbed.Sediment cores were not kept under refrigeration because there was only a short time from their collection and analysis.The cores ranged in length from 11—20m.The geotechnical investegation was part of a general geological study performed by the Institute of Oceanology,Academia Sinica,Qingdao.Some geotechnical properties of cores were measured and analyzed in laboratory,they are water content,bulk density,natural void radio,plastic index,plastic limit,shearing strength,sensitivity,compressibility and so forth.Sediment types of the cores can classified into three different groups from top downward the cores,depending on the different geotechnical properties of the sediments.1.Group of soft mud This group ranged in thickness from 2—4m.The group may be geotechnically characterized by its high water content,viod radio and high compressibility.Its shearing strength,permeability and bearing capability were lower than other two groups.Therefore,this group is not suitable for engineering construction.The sediment of the group might have been accumulated by discharges derived from the Huanghe River.2.Group of interbedding of subclayey,subsandy and sandy soils This group appeared below the first group,ranging in thickess from 2—13m.It was characterized geotechnically by its intermediate form between the first and third groups.3.Sand group Submerged depth of this group was about 5—17m under the sea floor.Its thickness was not known in detail.The group mainly consists of fine or very fine sand.The geotechnical properties of the group show low compressibility and high bearing capability.Therefore,the group provides a good foundation for engineering construction.
作者
秦蕴珊
徐善民
李凡
赵士金
Qin Yunshan(Y.S.Chin);Xu Shanmin;Li Fan;Zhao Shijin(Institute of Oceanology,Academia Sinica)
出处
《海洋与湖沼》
1983年第4期305-314,共10页
Oceanologia Et Limnologia Sinica
