埕北海域工程地质分区及模糊数学稳定性评价

Engineering geological zoning of Chengbei sea area and stability assessment using fuzzy mathematics

通过土工试验和粒度分析,发现埕北海域沉积物主要以粉土和粉质黏土为主,局部地区分布有粉砂和淤泥质土。综合考虑研究区沉积物、水深地形、地貌、地质灾害等因素,可将研究区划分为4个工程区:Ⅰ区、Ⅱ区、Ⅲ区和Ⅳ区。针对4个工程区,采用模糊数学的方法,选择直接影响工程稳定性的5个主要因素即:沉积物类型、主要持力层埋深、主要持力层承载力、地形地貌和地质灾害类型作为评价因子定量对各区稳定性进行评价,发现4个工程地质区的稳定性分别为:Ⅰ区(稳定区)、Ⅱ区(不稳定区)、Ⅲ区(较不稳定区)和Ⅳ区(较稳定区)。以此为研究区的工程建设提供设计依据。

In this paper,through grain-size analysis and geotechnical tests,it was found that the sediments of the Chengbei sea mainly comprise silt and silty clay and relatively low levels of silty sand and muddy soil.According to the sediments components,submarine landform,bathymetric data,and disaster geology,the research area can be divided into four engineering geological zones:Zone I,II,III,IV.Using a fuzzy mathematics method,the most prominent factors which influence the stability of the engineering geological zones were found to be soil type of the site,the depth and bearing capacity of the main bearing layer,the landform,and the types of geological disasters.The stability of the four engineering geological zones are unstable area(II),relatively unstable area(III),relatively stable area(IV),and stable area(I).The research results can provide a design basis for engineering construction in the study area.