This results in a decreasing amplitude in the first case and constant amplitude in the second . 在第一種情況下,它導(dǎo)致振幅遞減;在第二種情況下,振幅不變。
For the walls poured by ordinary concrete , the emm and ttm obtain the same qualitative conclusion , despite of some discrepancies in the specific value . but for the walls poured by the scc , the restraining stress calculated by the emm is remarkably smaller than that by the ttm . in other words , the emm results shows that the shrinkage compensation technology can take place the measures of setting dilatation joints , while the ttm results indicates that , though the restraining stress is decreased , the decreased amplitude is inadequate 對計算結(jié)果的比較和分析表明,對普通混凝土墻,結(jié)果的具體數(shù)值有差異,但反映的定性規(guī)律相同;對補償收縮混凝土墻,結(jié)果差異巨大,等效模量法認為補償收縮技術(shù)可實現(xiàn)無縫設(shè)計,而時程方法在承認補償收縮技術(shù)可減小約束應(yīng)力的同時,認為應(yīng)力減幅還不足以實現(xiàn)無縫設(shè)計。
The study shows that rock stress sensitivity has the following characteristics : rock property has little sensitivity to stress , of which porosity has the least , permeability less , and compression coefficient most ; the rock property decreases with formation pressure decrease ; in the same formation pressure drop , decrease amplitude of the rock property is not a continuous function of permeability but related to distribution scope of permeability 研究得出,巖石的應(yīng)力敏感性特征主要有:巖石物性對應(yīng)力的敏感性總體上不大,其中以孔隙度最小,滲透率次之,壓縮系數(shù)最大;巖石物性隨地層壓力的下降而下降;在同一地層壓降下,巖石物性下降幅度不是滲透率的連續(xù)函數(shù),而是與滲透率分布范圍有關(guān),高滲透率范圍,巖石物性下降幅度小,低滲透率范圍,巖石物性下降幅度大。