海上风电场建设的前期地质调查研究方法  

Study methods for preliminary geological survey of the construction of offshore wind farms

作　　者：韩孝辉 薛玉龙[1] 刘刚[1] 

机构地区：[1]海南省海洋地质调查研究院,海口570206

出　　处：《工程勘察》2018年第3期29-34,共6页Geotechnical Investigation & Surveying

基　　金：海南省国土环境资源厅项目(HZ2015-235)

摘　　要：建设海上风电场的前期地质工作是调查研究场址的地质条件适宜性问题,地质条件适宜性体现在地层的稳定性和地层的承载力两个方面。为研究海南岛东方市近海建设海上风电场适宜性问题,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,利用侧扫声呐图像数据研究测区海底地貌单元,识别可能引发小型地质灾害的潮流沙脊、沙波等地貌单元;利用单道地震数据研究海底浅地层沉积状况,识别可能引发地质灾害发生的断层、古河道、浅层气及海底滑塌等构造;根据地质钻孔岩芯样品的物理力学指标定量分析地层稳定性和承载力。研究结果表明,研究区域地层稳定性较好,有2个较好的持力层,满足风力发电塔承载力要求,研究区域适合海上风电场建设。The preliminary geological work in offshore wind farm construction is to investigate the suitability of geological conditions of the site,which is reflected in the stability and bearing capacity of the stratum. In order to study the suitability of offshore wind farm construction in Dongfang City in Hainan Island,the side-scan sonar,single-channel seismic survey and geological drilling are carried out in the study area. The data from the side-scan sonar images are used to study the submarine geomorphic units in the study area,and identify the tidal sand ridges,sand waves and other geomorphic units that may cause small-scale geological disasters. The single-channel seismic data are used to study the sedimentary conditions of submarine shallow stratum,and to identify the faults,ancient river channels,shallow gas and submarine slumping which may lead to geological disasters. The stability and bearing capacity of the stratum are quantitatively analyzed based on physical and mechanical indexes from geological borehole core samples. The study demonstrates that the stratum stability is good in the study area,where there are two good bearing strata which can meet the requirements of the bearing capacity of wind power tower. The study area is suitable for offshore wind farm construction.

关 键 词：侧扫声呐 单道地震 地质浅钻 岩土物理力学指标 

分 类 号：P736.22[天文地球—海洋地质]