长江科学院院报 ›› 2022, Vol. 39 ›› Issue (1): 94-99.DOI: 10.11988/ckyyb.20200786

• 岩土工程 • 上一篇    下一篇

广州南沙区软土分布特征及工程性质

刘伟, 陈凌伟, 张庆华, 黄佳铭, 吴龙飞   

  1. 广州市城市规划勘测设计研究院,广州 510060
  • 收稿日期:2020-08-05 修回日期:2020-10-09 出版日期:2022-01-01 发布日期:2022-01-14
  • 通讯作者: 陈凌伟(1990-),男,江西宜春人,高级工程师,博士,从事岩土工程勘察、设计及相关研究工作。E-mail:lingweichan@163.com
  • 作者简介:刘 伟(1970-),男,广东梅州人,正高级工程师,硕士,从事岩土工程勘察、设计及相关研究工作。E-mail:liuwei@gzpi.com.cn
  • 基金资助:
    广东省重点领域研发计划项目(2020B0101130009);广东省城市感知与监测预警企业重点实验室基金项目(2020B121202019);广州市城市规划勘测设计研究院科技基金项目(RDI2210204140, RDI2210204146)

Distribution and Engineering Characteristics of Soft Clay in Nansha, Guangzhou

LIU Wei, CHEN Ling-wei, ZHANG Qing-hua, HUANG Jia-ming, WU Long-fei   

  1. Guangzhou Urban Planning & Survey Design Research Institute, Guangzhou 510060, China
  • Received:2020-08-05 Revised:2020-10-09 Online:2022-01-01 Published:2022-01-14

摘要: 基于高密度均匀分布的4 280个钻孔资料,结合广州海岸变迁史及14C测年试验成果,深入研究了广州南沙区软土的空间分布特征。并依据成因时代和沉积环境,将南沙软土划分为两大层,其中上层为全新世软土层,14C年龄约为1 500~8 500 a;下层为更新世软土层,14C年龄约为34 000~45 000 a。同时对南沙区软土基本物理力学参数进行了统计和分析,对比研究了上下两层软土工程性质的差异。研究结果表明:南沙软土分布面积约718 km2,占全区总面积的91.6%,平均厚度15~20 m,普遍具有含水量高、孔隙比大、抗剪强度低、压缩性强、渗透性弱等特点;相较于下层软土,上层软土的厚度、含水率、孔隙比、压缩系数更大,抗剪强度更低,粉细砂含量较少。

关键词: 软土, 分布特征, 工程性质, 成因类型, 南沙区

Abstract: The distribution characteristics of soft clay in Nansha, Guangzhou were examined based on the data of 4 280 boreholes with high density and uniform distribution in association with the coastal history of Guangzhou and 14C test results. According to the genetic age and sedimentary characteristics, the soft clay in Nansha was divided into two layers. The upper layer was formed in Holocene, whose 14C age was 1 500-8 500 years, and the lower layer was formed in Pleistocene, whose 14C age was 34 000-42 000 years. The engineering properties of the two layers were systematically compared via statistical analysis on the physical and mechanical parameters. The research results unveiled that the soft clay in Nansha covers an area of 718 square kilometers, accounting for 91.6% of its total area, with an average thickness of 15-20 m. In general, the soft clay in Nansha is of high water content, large void ratio, low shear strength, strong compressibility and weak permeability. Compared with the lower layer, the upper soft clay has higher thickness, void ratio, pore ratio and compression coefficient, lower shear strength and less fine sand content.

Key words: soft clay, distribution characteristics, engineering characteristics, genetic types, Nansha

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