Study On Gray-Fuzzy Comprehensive Evaluation Of Regional Engineering Geological Of Jiaozhou Bay Area

In order to meet the demand of economic and social development of Jiaozhou Bay area, and set up basis to programming, field choosing and construction of projects, disaster preventing as well, the regional engineering geological stability of Jiaozhou Bay under the effects of various geological factors and human activities is studied. The study area is between east longitude 119°48′and 120°43′, north latitude 35°42′and 36°31′(40192 km2 or so).The stability of regional structure is mostly analysed, the ground stability and the stability of the rock and soil mass are also included, in the regional engineering geological stability study. Thereinto, the performance of defaults and earthquakes is mainly analysed in regional structural stability. Based on the sufficient information of land and sea, the hiberarchy models of them are set up respectively with analytic hierarchy process (AHP in short). By the hierarchy ordering and test of coherence, the influential weights of 9 terrestrial factors and 4 oceanic factors to engineering geological stability are calculated.On the map of 1:10 0000, study area is subdivided into 409 cells, including 343 terrestrial cells and 66 oceanic cells. The shape of terrestrial cell is foursquare (3km×3km), and the oceanic cell is further subdivided into 2 right-angle triangles, in the foursquare cell, along the NW~SE diagonal.Based on the basic stability of study area, 3-grade evaluating system is applied, including"stable","moderately stable"and"instability". The evaluating standard of 13 stability influential factors is set up, the membership grade of single factor is calculated by simple function. According to the gray-fuzzy comprehensive evaluating model (GF evaluation in short), 2-stage evaluation is applied to terrestrial stability, and 1-stage evaluation for oceanic stability. The evaluating result of regional engineering geological stability of study area is educed by GF evaluation, and different subareas are zoned. Explanation is given toward the result, and suggestionsare provided for construction toward different subareas. It is found that the evaluating result and characteristics of different factors fit well by comparison, indicating that the combination of AHP and GF evaluation is quotable for regional engineering geological stability study.Finally, issues of this paper and prospect of engineering geological stability study are proposed.