海南感城近海工程地质特征研究
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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 around the study area,which may trigger potentially small geological disasters.In accordance with the interpretation results of the single channel seismic survey and the physico-mechanical 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 calculation 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 solidpile,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 prevention measurement in place.
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 around the study area,which may trigger potentially small geological disasters.In accordance with the interpretation results of the single channel seismic survey and the physico-mechanical 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 calculation 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 solidpile,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 prevention measurement in place.
引文
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[20]田淑娟,王新中,张米军.测定土的次固结系数及方法[J].水科学与工程技术,2010(3):52-53.
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[22]马忠涛,栾茂田,Jeng Dong-Sheng,等.随机波浪作用下海床动力响应及其液化的理论分析[J].岩土力学报,2008,29(8):2 051-2 076.
[23]汤健健.偏斜预应力管桩的低应变检测及实例分析[J].工程地球物理学报,2015,12(5):700-703.
[24]雷佳祥,施东升.上海某工程地基承载力检测中的异常情况浅析[J].工程地球物理学报,2016,13(3):399-404.
[2]刘文涛,石要红,曾宁烽.海南后水湾海域浅层粘土的工程地质特性评价[J].海南大学学报(自然科学版),2013,31(4):317-322.
[3]王超凡,殷红艳,赵永贵.海南石梅湾地区工程地质条件综合研究[J].工程地质学报,2001,9(3):282-285.
[4]马国凯,李振宇.综合物探技术在滑坡监测中的应用研究[J].工程地球物理学报,2016,13(2):191-195.
[5]林承灏,潘浩波,方良好,等.浅层地震反射波法在某大型工程场址工程地质勘查中的应用[J].工程地球物理学报,2016,13(5):652-658.
[6]杨江平,石要红,曾宁烽,等.广西北海近海工程地质特征及特殊性问题分析[J].地质学刊,2015,39(4):633-640.
[7]杨忠年,贾永刚,张琳,等.海浪导致粉质土海床破坏过程实验研究[J].中国海洋大学学报,2015,45(5):75-81.
[8]顾小芸.粘质海底稳定性实例分析[J].工程地质学报,1996,4(1):32-38.
[9]王尔觉,潘广山,胡庆辉.近海工程勘察中单道与多道地震方法对比研究[J].工程地球物理学报,2016,13(4):502-507.
[10]陆兆溱.工程地质学[M].北京:中国水利水电出版社,2001.
[11]刘春,白世伟,赵洪波.粘性土土性质指标的统计规律研究[J].岩土力学,2003,24(增刊):180-184.
[12]阮波,冷伍明.粘性土物理力学指标的统计分析[J].大坝观测与土工测试,1998,22(1):5-7.
[13]高抒,方国洪,于克俊,等.沉积物输运对砂质海底稳定性影响的评估方法及应用实例[J].海洋科学集刊,2001,43:25-37.
[14]高孟潭,陈国星,谢富仁,等.中国地震动参数区划图(GB18306-2015)[S].北京:中国标准出版社,2015.
[15]中国人民共和国交通运输部.港口工程桩基规范(JTS167-4-2012)[S].北京:人民交通出版社,2012.
[16]刘敏,刘博,年延凯,等.线性波加载下海底斜坡失稳机制的数值分析[J].地震工程学报,2015,37(2):415-421.
[17]吴梦喜,楼志刚.海波作用下海床的稳定性与液化分析[J].工程力学,2002,19(5):98-102.
[18]王立忠,潘冬子,潘存鸿,等.波浪对海床作用的实验研究[J].土木工程学报,2007,40(9):101-109.
[19]吴梦喜,楼志刚.立波作用下海床的有效应力与液化分析[J].水利学报,2002,33(11):56-61.
[20]田淑娟,王新中,张米军.测定土的次固结系数及方法[J].水科学与工程技术,2010(3):52-53.
[21]冯秀丽,叶银灿,马艳霞,等.动荷载作用下海底粉土的孔压响应及其动强度[J].青岛海洋大学学报,2002,32(3):429-433.
[22]马忠涛,栾茂田,Jeng Dong-Sheng,等.随机波浪作用下海床动力响应及其液化的理论分析[J].岩土力学报,2008,29(8):2 051-2 076.
[23]汤健健.偏斜预应力管桩的低应变检测及实例分析[J].工程地球物理学报,2015,12(5):700-703.
[24]雷佳祥,施东升.上海某工程地基承载力检测中的异常情况浅析[J].工程地球物理学报,2016,13(3):399-404.