摘要
南通地区受河流沉积与海洋沉积相互交替作用影响,广泛分布海陆交互相沉积黏性土。准确评价该类土体工程特性及其地基承载力对于工程建设安全和成本管控至关重要。以往研究大多是将其作为一层黏性土或亚黏土和亚砂土两类土进行并层研究,得出其不良物理性质与良好力学特性指标“异常”组合的结论。本文基于大量室内土工试验和现场原位测试试验,对海陆交互相互层土进行土层细分,并对比分析了互层土中各类土层的状态和强度参数随深度的变化特征,探讨该类土地基承载力的取值。研究发现当对互层土进行精细化土层划分的情况下,基于物理性质和静力触探结果确定的第②层黏性土和粉土的地基承载力是较为一致的,但第③层土通过两种方法确定的地基承载力差别仍较大,尚需结合其他现场试验和地区经验综合确定。
Influenced by the alternating action of river sedimentation and marine sedimentation,the interactive marine&terrestrial cohesive soil is widely distributed in Nantong area.Accurately evaluating the geotechnical engineering properties and bearing capacity of such soils is crucial for ensuring engineering safety and controlling construction costs.Most of the previous studies treated it as one layer of clay or two types of sub-clayey and sub-sandy soils,and concluded that it had a peculiar combination of poor physical properties and good mechanical properties.Based on a large number of laboratory geotechnical tests and field in-situ tests,the subdivision of the interactive marine&terrestrial deposit is carried out,and the variation of the state and strength parameters of soil layers with depth is compared and analyzed.Then,the value of the bearing capacity of this type of soil foundation is discussed.It is found that the bearing capacity of the second layer of clay and silt based on physical properties and CPT data is relatively consistent when the interlayer soil is further divided,but the bearing capacity of the third layer of soil still needs to be determined by combining other field tests and regional experience.
作者
祝进兵
ZHU Jinbing(China Railway Wuhan Survey and Design Institute Co.,Ltd.,Wuhan 430074,China)
出处
《建筑结构》
北大核心
2023年第S02期2358-2361,共4页
Building Structure
关键词
海陆交互相
互层土
工程特性
地基承载力
interactive marine&terrestrial deposit
interbedded soils
engineering property
bearing capacity
