南黄海油气资源区粘性土物理力学性质及微结构特征  

Physicomechanical Properties and Microstructure Features of Cohesive Soil in the Southern Yellow Sea Oil and Gas Resource Area

作　　者：李萍[1] 李培英[1] 徐兴永[1] 刘乐军[1] 杜军[1] 

机构地区：[1]海洋沉积与环境地质国家海洋局重点实验室

出　　处：《海洋科学进展》2005年第4期482-486,共5页Advances in Marine Science

基　　金：国家海洋局青年海洋科学基金项目--南黄海油气资源区海底沉积物工程地质特征(2000507);国家重点基础研究发展规划预研究计划项目--中国海岸带灾害地质特征及其评价和趋势预测研究(2002CCA04800)

摘　　要：用土质学的显微结构理论和技术方法,研究了南黄海油气资源区粘性土微结构特征。结合原状样物理力学性质参数,研究颗粒接触、堆垒、孔隙等现象与物理力学性质之间的关系。研究结果表明,沉积物主要为粘质粉土、淤泥质粉质粘土和淤泥等粘性土,其微结构类型有粒状链接微结构、蜂窝状微结构和疏松基质状微结构3种,其中淤泥类土主要为蜂窝状微结构和疏松基质状微结构,结构疏松,孔隙度较大,含水率很高,强度低,压缩性高。粘质粉土为粒状链接微结构,含水率较低,孔隙度相对淤泥类土较小,抗剪强度比淤泥类土略高,压缩性较高。该区粘性土为不理想工程地基土,工程施工时应采取相应措施避开或对其进行改良。The soil microstructure theory and technical method are used to stady the microstructure features of cohesive soil in the southern Yellow Sea oil and gas resource area, and in combination with the physicomechanical property parameters of undisturbed soil samples the relations of grain contact, accumulation and porosity to soil physicomechanical properties are studied. It is shown from the study results that the main sediments are cohesive soil including clayey silt, muddy silty clay and sludge, and their microstructures include granular chain structure, honeycomb structure and loose matrix structure. Among them, the microstructures of muddy soil are honeycomb structure and loose martrix structure with loose structure, large porosity, high water content, low shear strength and high compressibility, and＇the microstructure of clayey silt is granular chain structure with low water content, porosity less than that of muddy soil, shear strength higher than that of muddy soil and high compressibility. Therefore, the cohesive soil in this area is undesirable engineering foundation soil, and appropriate measures should be taken in the course of construction to avoid or improve these cohesive soils.

关 键 词：南黄海 油气资源区 做结构 物理力学性 

分 类 号：P642[天文地球—工程地质学]