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、80 kPa,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。
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 transverseisotropic.It is better to treat the foundation with sand well or plastic plate.
作者
杨松
YANG Song(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)
出处
《路基工程》
2024年第2期36-42,共7页
Subgrade Engineering
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
high-speed railway
coastal plain
soft soil
high compressibility
foundation treatment
sedimentary cycle
