沿海高铁滨海平原软土力学特性研究
Study on Mechanical Characteristics of Soft Soil in Coastal Plain of Coastal High-speed Railway
杨松1
作者信息
- 1. 中铁第四勘察设计研究院集团有限公司,武汉 430063
- 折叠
摘要
根据沿海高铁汕头至汕尾段定测勘探成果,对上千组土工试验数据进行统计分析,研究不同沉积成因的软土工程地质特性,并结合实际工程分析软土对工程建设的影响.结果表明:滨海沉积相、泻湖相、三角洲冲积相软土含水量约40％～60％、孔隙比大于1.2、压缩系数大于0.5,结构松散软弱,属于高压缩性土;榕江三角洲冲积相软土分为两层,形成于两个海潮沉积旋回,其承载力特征值分别为60、80kPa,两层淤泥质土需考虑软土震陷;三角洲沉积相粉细砂层多夹淤泥或淤泥质土,属层状构造土,力学性质具有横观各向同性,采用砂井或插塑板处理地基的效果较好.
Abstract
Based on the survey results from Shantou to Shanwei section of coastal high-speed railway,thousands of geotechnical test data were statistically analyzed to study the engineering geological characteristics of soft soil of different sedimentary origin,and the influence of soft soil on engineering construction was analyzed in combination with actual engineering.The results show that the soft soil of coastal sedimentary facies,lagoon facies and delta alluvial facies has a water content of about 40％—60％,a pore ratio greater than 1.2 and a compression coefficient greater than 0.5,and a loose and weak structure,belonging to high compressibility soil.The alluvial facies soft soil in Rongjiang Delta is divided into two layers,formed in two tidal sedimentary cycles,and the bearing capacity characteristic values are 60,80 kPa respectively.Earthquake subsidence of soft soil should be considered for two layers of silt soil.Delta sedimentary facies silty sand layer is laminated with silt or silt soil,belongs to layered structural soil.Its mechanical properties are transverse-isotropic.It is better to treat the foundation with sand well or plastic plate.
关键词
高速铁路/滨海平原/软土/高压缩性/地基处理/沉积旋回Key words
high-speed railway/coastal plain/soft soil/high compressibility/foundation treatment/sedimentary cycle引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据