水泥稳定三峡库区风化砂回弹模量试验及模型评估

以水泥稳定三峡库区风化砂的回弹模量值为研究对象,在风化砂中分别掺入3%、5%、7%、9%的水泥制作试样,然后各自养护7、14、21、28、35、56、70 d,开展室内回弹模量试验。试验结果表明:掺水泥能显著提高风化砂的回弹模量值。在相同的养护龄期下,随着水泥掺量的增加,回弹模量值逐渐增大,增长的幅度先大后小,二者呈现良好的对数函数关系;在相同的水泥掺量下,随着养护龄期的增长,回弹模量值也逐渐呈线性增大,且在最初养护的28 d内,回弹模量值的增长占整个测试期内的95%左右。通过回归分析,分别建立了水泥掺量与回弹模量值之间、养护龄期与回弹模量值之间的数学模型,再通过补充试验,进一步验证了所建数学模型的正确性及精确度。

The resilience modulus test and model evaluation of cement stabilizedweathered sand distributing around the Three Gorges reservoir

Taking rebound modulus value of cement stabilized weathered sand distributing around the Three Gorges reservoir as the research object, we made samples by mixing the weathered sand with 3%, 5%, 7%, and 9% cement respectively, then cured the samples for 7, 14, 21, 28, 35, 56, 70 d respectively, and carried out the resilient modulus test. The experimental results show that mixing cement can significantly improve the rebound modulus value of the weathered sand. Under the same curing age, with the increase of cement content, the rebound modulus value gradually increases and its growth magnitude first increases and then decreases. The relationship between the cement content and the rebound modulus value expresses good logarithmic function. Under the same cement content, with the increase of curing age, the rebound modulus value also gradually increases linearly. Within the first 28 days of curing, the growth of rebound modulus value is about 95% of that of the entire test period. Through regression analysis, the mathematical model between the cement content and the rebound modulus values and the mathematical model between the curing age and the rebound modulus values were established respectively. And the correctness and the accuracy of the mathematical models were further verified through additional test.