second principal stress 中文意思是什麼
second principal stress
解釋
第二主應力-
Research shows that four factors have great influence on the formation of complex rock mass. first, rock mass subjected six times of tectonic movement during long period of geo - history, each tectonic movement produced fractures and associated joints corresponding to the orientation of maximum principal stress and deteriorated the properties of fractures formed at former period ( s ). second, down - cutting of langcangjiang river produced unloading fractures
採用了四種巖體質量分級評價方案對研究區巖體質量進行了研究,這四種方案包括:工程巖體分級標準( gb50218 - 94 ) 、水利水電圍巖工程地質分類( gb50267 ? 99 ) 、巖體rmr分類( bieniawski , 1973 ) 、巖體質量指數z分級(小灣, 1995 ) 。
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