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辽阳市区地表浅部呈透镜状断续分布的松软土体———淤泥质粉质粘土为静水或缓慢流水环境沉积，经生物化学作用而形成的。本文对其分布、形成、物质结构及工程地质特性进行了较系统的描述。并依据大量现场测试及室内土工试验成果，分析论述了该层软土天然独特的含水量高，孔隙比大，强度低，压缩性高，具触变性及承载力低的工程地质特性对勘察施工及建筑物稳定性的不良影响，提出了避让、挖除、选择合适桩型等科学合理的工程处理建议。
The shallow surface of Liaoyang City was lenticular discontinuous distribution of soft soil --- silt silty clay as hydrostatic or slow flow environment deposition, formed by the role of biochemistry. This paper describes its distribution, formation, material structure and engineering geological characteristics more systematically. Based on a large number of field tests and indoor soil test results, this paper analyzes the natural and unique engineering geological characteristics of this layer of soft natural soft clay with high water content, large void ratio, low strength, high compressibility, thixotropy and low bearing capacity. And the adverse effects of the stability of the building, put forward the scientific and reasonable engineering treatment suggestions such as avoidance, excavation and selection of suitable pile types.