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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    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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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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History
  • Received:September 05,2018
  • Revised:June 03,2019
  • Adopted:
  • Online: July 17,2019
  • Published: