莱州湾滨海地区饱和液化砂土特征及液化评价

Characteristics of Saturated Liquefied Sand and Liquefaction Evaluation in Coastal Area in Laizhou Bay

通过对区内257个钻孔(工程地质孔及第四纪地质孔)资料分析,划分了莱州湾滨海地区地貌单元,阐述了全新世砂体特征;利用三角洲平原区砂性土层非饱和砂土和饱和砂土静探数据和标贯数据的对比分析,采用数理统计方法,建立了非饱和砂土对饱和砂土的静探锥尖阻力与锥尖阻力、标贯击数与标贯击数的相关关系式,研究了地下水对静探锥尖阻力和标贯击数的影响;依据《建筑抗震设计规范》(GB50011-2010),采用标准贯入和静力触探综合判别法,对全新世砂体进行现状条件下和未来地下水限采条件下砂土液化判别;并针对液化区不同液化条件提出相应砂土液化防御措施。

Based on the data analysis of 257 boreholes(engineering geological boreholes and quaternary geological boreholes)in the area,geomorphic units in Binhai bay and Laizhou bay are divided,and the characteristics of Holocene sand bodies are described.Based on comparison and analysis of static exploration data and standard penetration data of unsaturated sand and saturated sand in sandy soil layer of Delta Plain area,a mathematical statistical method is adopted,the relationship between cone-tip resistance and cone-tip resistance,the number of penetration marks and the number of penetration marks of unsaturated sands are established.According to the"Chinese Code for Seismic Design of Buildings"(GB50011-2010),the standard penetration and static cone penetration comprehensive discriminant methods are used to distinguish the liquefaction of sand body in Holocene series under the present condition,and the future limited exploitation condition of groundwater.According to different liquefaction conditions in liquefaction area,the corresponding measures of sand liquefaction prevention are put forward.