海南感城近海工程地质特征研究  

Study of Engineering Geological Characteristics of the Offshore Area in Gancheng,Hainan

作　　者：韩孝辉 薛玉龙[1] 陈文[1] 

机构地区：[1]海南省海洋地质调查研究院,海南海口570206

出　　处：《工程地球物理学报》2017年第1期69-76,共8页Chinese Journal of Engineering Geophysics

基　　金：海南省国土环境资源项目(编号:HZ2015-235)

摘　　要：为了研究海南岛感城近海拟建海上风力发电场场址区域的海底地层稳定性问题和地层承载力问题,在研究区域进行了侧扫声呐测量、单道地震测量和地质钻探工作。侧扫声呐声图显示,在研究区域周围20m以深水域发育有可能引发小型地质灾害的潮流沙脊、沙波等地貌单元;根据单道地震数据资料的解译成果和三口地质浅钻的岩心样品物理力学指标分析,确认在研究区域海底地层有两层较好的持力层;根据小振幅波理论定量地分析了研究区域海床的稳定性问题,根据定量计算的结果,表明研究区域海床相对稳定,但在天然地震基本烈度为6°条件下海床可能失稳;根据单桩实心打入桩轴向抗压承载力设计值公式得到单桩轴向极限承载力值,表明研究区域地层承载力完全满足三桩结构的风力发电塔建设要求。研究结果表明,研究区域的地质条件按有关规定抗震设防,建设海上风力发电场是可行的。In order to study the horizon stability and bearing capacity of the seabed of the offshore area in Gancheng, Hainan, where a marine wind power plant is proposed to be constructed, side scan sonar survey, single channel seismic survey, and geological drilling were conducted within the area. Acoustic images from side scan sonar survey shows that there are tidal sand ridges and sand ripples developed in deep marine area about 20 meters a-round the study area, which may trigger potentially small geological disasters. In accord-ance with the interpretation results of the single channel seismic survey and the physico-me- chanical index analysis report of the core sample of the three shallow drills, it is confirmed that there are two strong supporting layers under the seabed. The seabed stability was quantitatively analyzed based on the small amplitude wave theory. The quantitative calcula-tion shows that the seabed of the target area is relatively stable, but it may become unstable below six degree of the basic earthquake intensity. The ultimate axial bearing capacity of single pile obtained by the design value function of the axial bearing capacity of single solid pile,shows that the bearing capacity of the layers meets the requirement of the wind power tower with three piles. The geological condition of the area is suitable for the construction of the marine wind power tower provided the necessary earthquake resistance and preven-tion measurement in place.

关 键 词：单道地震 地质浅钻 感城 岩土物理力学指标 

分 类 号：P631.4[天文地球—地质矿产勘探]