Abstract:

The location advantage of the Pearl River Estuary is obvious, but the geo-engineering and geo-hazardous conditions of the estuary are complicated. It is essential to survey and evaluate the engineering geo-environment with the increasing human engineering activities in the Pearl River Estuary. The results of marine geology and geophysics investigations in recent years are collated. Based on the hazardous geology factors and engineering properties of seabed soil in the study area, the assessment index system of engineering geological environment is established. By hierarchy of analysis methods, the weight value of each assessment index is calculated. The Pearl River Estuary is then divided into 577 cells, and the engineering geological environment quality for each cell is evaluated using the fuzzy synthetic evaluation method. The study area is divided into five zones: stable zone, relatively stable zone, basically stable zone, relatively unstable zone, and unstable zone. The results show that 70% of the research area is stable, while 26% of it is relatively unstable or unstable. In addition to natural geological hazardous factors including active faults and earthquakes, the human engineering activities become more and more important to engineering geological environment quality.

Key words: engineering geo-environment, evaluation and subdivision, assessment index, fuzzy math, Pearl River Estuary