positive creep meaning in English

正向波形不稳
正向波形蠕变

Test results show that : ( 1 ) the amount of creep deformation during monotonic primary loading depends on strain rate before creep , creep stress level , and creep time ; ( 2 ) during monotonic primary loading , the stiffness increasing magnificently shortly after creep ; ( 3 ) the direction of creep will change from positive creep ; to neutral creep and negative creep during unloading , while during reloading , it will change from negative , to neutral and positive creep
试验结果表明： ( 1 )在初始加载过程中，经过一定时间蠕变后黏土的强度有很大的提高； ( 2 )在卸载过程中，随应力值下降黏土的蠕变表现出由正蠕变、中性蠕变到负蠕变的逐渐转化； ( 3 )在重复加载过程中，随应力值增加黏土的蠕变表现出由负蠕变、中性蠕变到正蠕变的逐渐转化。