Ji Richard, Siddiki Nayyarzia, Nantung Tommy, Kim Daehyeon
INDOT Office of Research and Development, 1205 Montgomery Street, West Lafayette, IN 47906, USA.
INDOT Materials and Testing, 100 N. Senate Avenue, Indianapolis, IN 46204, USA.
ScientificWorldJournal. 2014 Feb 20;2014:372838. doi: 10.1155/2014/372838. eCollection 2014.
In order to implement MEPDG hierarchical inputs for unbound and subgrade soil, a database containing subgrade M R , index properties, standard proctor, and laboratory M R for 140 undisturbed roadbed soil samples from six different districts in Indiana was created. The M R data were categorized in accordance with the AASHTO soil classifications and divided into several groups. Based on each group, this study develops statistical analysis and evaluation datasets to validate these models. Stress-based regression models were evaluated using a statistical tool (analysis of variance (ANOVA)) and Z-test, and pertinent material constants (k 1, k 2 and k 3) were determined for different soil types. The reasonably good correlations of material constants along with M R with routine soil properties were established. Furthermore, FWD tests were conducted on several Indiana highways in different seasons, and laboratory resilient modulus tests were performed on the subgrade soils that were collected from the falling weight deflectometer (FWD) test sites. A comparison was made of the resilient moduli obtained from the laboratory resilient modulus tests with those from the FWD tests. Correlations between the laboratory resilient modulus and the FWD modulus were developed and are discussed in this paper.
为了实现无结合料和路基土的MEPDG分层输入，创建了一个数据库，该数据库包含来自印第安纳州六个不同地区的140个原状路基土样的路基回弹模量（(M_R)）、指标特性、标准击实试验结果以及室内(M_R)。(M_R)数据根据AASHTO土壤分类进行了分类，并分成了几组。基于每组数据，本研究开发了统计分析和评估数据集以验证这些模型。使用统计工具（方差分析（ANOVA））和Z检验对基于应力的回归模型进行了评估，并确定了不同土壤类型的相关材料常数（(k_1)、(k_2)和(k_3)）。建立了材料常数以及(M_R)与常规土壤性质之间相当良好的相关性。此外，在不同季节对印第安纳州的几条高速公路进行了落锤式弯沉仪（FWD）测试，并对从FWD测试地点采集的路基土进行了室内回弹模量测试。对室内回弹模量测试得到的回弹模量与FWD测试得到的回弹模量进行了比较。本文建立并讨论了室内回弹模量与FWD模量之间的相关性。
