【摘要】 在前一工作基础上，对经一次循环后应力值不能完全恢复的现象进行了进一步研究。结果表明是因碎球引起。这不仅圆满地解释了实验现象，而且对该方法的科学性，实用性作了进一步考察。更多还原

【Abstract】 Based on the previous work ,a phenomenon that the swelling stress can not berecovered completely has been investigated deeply. The crack of the ion exchangeresin is responsible for this phenomenon. Thus not only are the experimental results explained satisfyingly,but also this monitoring methos is evaluated.It showsagain the promise of this kind of modern research aproach.更多还原