英语翻译Unloading-Reloading.-Davis and Poulos (6),Makhlouf and Stewart (26),Karst,et al.(15),Ko and Scott(16),and Holubec(13) have shown that soil is an elasto-plastic material in the sense that strains induced upon primary loading are only parti

英语翻译Unloading-Reloading.-Davis and Poulos (6),Makhlouf and Stewart (26),Karst,et al.(15),Ko and Scott(16),and Holubec(13) have shown that soil is an elasto-plastic material in the sense that strains induced upon primary loading are only parti
英语翻译
Unloading-Reloading.-Davis and Poulos (6),Makhlouf and Stewart (26),Karst,et al.(15),Ko and Scott(16),and Holubec(13) have shown that soil is an elasto-plastic material in the sense that strains induced upon primary loading are only partially recoverable upon unloading,and when reloaded it behaves nearly elastically .To study this aspect of the behavior of the sand described previously,additional tests were conducted in which specimens were subjected to one or more cycles of unloading and reloading.The results of one of these tests on dense sand is shown in Fig.11.It may be noted that for cycles of unloading and reloading the sand has a small amount of hysteresis,but is very nearly linear and elastic .Furthermore,the modulus values for both cycles of unloading-reloading are the same,even though they occur at different strains and stress levels .Tests conducted on loose specimens of this sand gave similar results,and similar behavior has been found to be characteristic of other soils by Ko and Scott(16).On the basis of these observations it seems reasonable to believe that the stress-strain behavior of soil on unloading and reloading may be approximated with a high

英语翻译Unloading-Reloading.-Davis and Poulos (6),Makhlouf and Stewart (26),Karst,et al.(15),Ko and Scott(16),and Holubec(13) have shown that soil is an elasto-plastic material in the sense that strains induced upon primary loading are only parti
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卸载和重新加载：Davis 和 Poulos (6),Makhlouf 和 Stewart (26),Karst 等人(15),Ko 和 Scott(16),以及 Holubec(13)等的论文表明,土壤是一种弹塑性材料,初次加载所引起的应变在卸载后只会复原一部分,重新加载时,它几乎完全表现为弹性行为.为了研究砂土的这一行为,我们对砂土试样进行了一个或多个循环卸载及重新加载的测试.其中密砂的结果如图11所示.
砂土在卸载和重加载循环后,应力应变曲线有些微滞后,但仍是非常接近线弹性行为.此外,在两个卸载和重加载循环中,虽然应力应变的值不同,弹性模量是一样的.对散沙的测试也有类似结果,正如Ko和Scott(16)关于其他土壤特性的研究.综上所述,土壤在卸载和重加载时的应力应变行为可以用高.来近似模拟.