基于沉积环境与工程地质特征的湖相软土分类研究——以鄱阳湖流域四种典型软土为例
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本文为江西省水利科技项目(编号: KT201635)、江西省水工程安全中心开放基金重点项目(编号: OF201603)、江西省教育厅科技研究项目(编号: GJJ151124)、江西省科技厅第一批科技计划项目(编号: 20161BBG70051)、国家自然科学基金应急管理项目(编号: 41641023)、2017年国家大学生创新创业项目(编号: 201705)以及南昌工程学院第十六届挑战杯项目的成果。


Classification of lacustrine soft soil based on sedimentary environment and engineering characteristics —— A case study of four typical soft soil in Poyang Lake basin
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    摘要:

    在内陆地区的淡水湖区域,地质低洼,软土广泛分布,主要有河床相、湖沼相、三角洲相和沼泽相等第四系以来新近沉积的软土。这些软土埋藏厚度变化大、压缩性大、非均质性强、含水率高、强度低,极易发生变形沉降甚至工程事故。本文以中国面积最大淡水湖鄱阳湖流域四种典型软土为例,综合利用衍射仪、SEM扫描、GDS高级试验系统等仪器,对区内132个软土试样的矿物组成和工程地质特征开展了研究,并基于沉积环境、软土组构及其工程特性对软土类型进行了分类。结果表明: 以软土沉积的地质环境、宏观结构和微观组成及工程特性进行柔性分类,有利于建立湖相软土的可搜索的数据库,有利于长江经济带软土工程地质问题的科学解决。

    Abstract:

    Objectives:The soft soil is widespread in the Poyang lake area,east China,and there exist different sub- type of the soft soil in this largest freshwater lake area in China.These soft soils have great changes in burial thickness, high compressibility, strong heterogeneity, high moisture content and low strength, and are prone to deformation, subsidence and even engineering accidents. Methods: This article focused on the mineral composition and structure of the soft soil, physical and mechanical properties, and the correlation of the essential indexes in Poyang lake basin,Jiangxi province,based on a series of laboratory test: utilization of diffraction, SEM scanning, GDS advanced test analysis results divided the soft soil into 4 sub- classifications, the riverbed facies, the lacustrine facies, the delta facies and the swamp lacustrine facies,respectively,which determined by the sedimentary environment and engineering characteristics. Results:The research result shows that the sedimentary environment of soft soil is essential factor of soft soil classification.According to mineral composition analysis and geological sedimentary structure, the riverbed facies was deposited as clay—clastic soft soil, and the soft soil of lacustrine facies is clastic — sericite type soft soil, deltaic sedimentary soft soil is also clastic sericite type. Conclusions: Based on the Field investigation and lab test of the soft soil in Poyang lake area,combining with the regional distribution,the mineral composition and the geochemical characteristics of the newly deposited since the Quaternary system in largest fresh water lake of the China,detailed comparative analysis between the edimentary environment and sedimentary characteristics and the main engineering geological characteristics in Poyang lake region,the 4 sub- classification distribution area was proposed, and result show the the flexible classification based on the geological environment, macrostructure, microstructure and engineering characteristics of soft soil deposits is conducive to the establishment of a searchable database of lake soft.

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甘建军,万胜,李荐华,唐春,杨涛,罗藏青排.2019.基于沉积环境与工程地质特征的湖相软土分类研究——以鄱阳湖流域四种典型软土为例[J].地质论评,65(4):983-992,[DOI].
GAN Jianjun, WAN Sheng, LI Jianhua, TANG Chun, YANG Tao, LUOZANG Qingpai.2019. Classification of lacustrine soft soil based on sedimentary environment and engineering characteristics —— A case study of four typical soft soil in Poyang Lake basin[J]. Geological Review,65(4):983-992.

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  • 收稿日期:2018-09-05
  • 最后修改日期:2019-06-03
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  • 在线发布日期: 2019-07-17
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