摘要
基于港珠澳大桥、深中通道、虎门大桥等工程的精细化勘察成果,分析了珠江口地区岩土层地质特性,区内岩土层可划分为淤泥质软土层、黏土粉质黏土层、中粗砂层、残积土层、不同程度风化基岩共5大层,结合区内水动力环境、沉积物类型、钻孔对比及地质剖面,将研究区划分为河口砂质沉积区、潮流型泥质沉积区、泥砂混合沉积区、浅海泥砂混合沉积区等4类。珠江口地区岩土层的物性参数特征研究表明,随着深度增大,岩土层含水率降低,快剪黏聚力增大,压缩系数减小,压缩模量增大;原状土十字板抗剪强度C_(u)与软土含水率w呈幂函数相关,与压缩模量E_(s)、快剪黏聚力c呈线性正相关;孔压静力触探试验比贯入阻力p_(s)与含水率w呈对数相关,与压缩系数a_(1−2)呈幂函数相关,与黏性土、砂类土的快剪黏聚力c呈线性正相关,得到的经验公式可为珠江口地区类似场地工程建设提供参考。
Based on the geological survey results along the Hong Kong-Zhuhai-Macao Bridge,the Shenzhen-Zhongshan Bridge,and the Humen Bridge,geological characteristics of the rock and soil layers in the Pearl River Mouth areas are analyzed.The rock and soil layers can be divided into five layers:silty soft soil layer,clay silty clay layer,medium-coarse sand layer,residual soil layer and weathered rocks.Combined with the hydrodynamic environment,sediment types,borehole comparison and geological section,the study area can be divided into four types of sedimentary areas:the estuary sandy sedimentary area,tidal mud sedimentary area,mud-sand mixed sedimentary area and shallow sea mud-sand mixed sedimentary area.The physical properties are examined,with the increase of depth,the moisture content decreases,the fast shear cohesion increases,the compression coefficient decreases,and the compression modulus increases.The vane strength has the power function correlation with water content,the linear positive correlation with compression modulus and fast shear cohesion.The specific penetration resistance of CPTU has the logarithmic correlation with water content,power function correlation with compression coefficient,and linear positive correlation with fast shear cohesion.The empirical formula can provide references for the construction of similar sites in the Pearl River Mouth area.
作者
么玉鹏
姚坚毅
唐世雄
YAO Yupeng;YAO Jianyi;TANG Shixiong(CCCC Highway Consultants Co.Ltd.,Beijing 100010,China)
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2022年第2期64-70,共7页
Hydrogeology & Engineering Geology
基金
中交集团科技重大专项(K19056A ZY19056A ZB19056A)。
关键词
珠江口
沉积分区
物理力学指标
十字板试验
孔压静力触探试验
the Pearl River Mouth
sedimentary zoning
physical and mechanical indicators
vane shear test
CPTU