ABSTRACT

Shear stress behaviour is one of the predominant characteristics which influence the performance of Interlocking Concrete Block Pavement. The primary objective of the present study is to find the influence of bedding sand and jointing sand on the interface shear stress behaviour of Interlocking Paver Blocks (IPB) and bedding sand. The shear stress behaviour was studied using a large-scale direct shear test. Three grades of bedding sand were involved in the study. PLAXIS software was used to simulate the laboratory test results and the accuracy of the test results was statistically validated. In order to avoid tedious experimental studies, further analysis was executed using PLAXIS software. Eight gradations of jointing sand were analysed using numerical modelling to interpret its influence on the interface shear stress behaviour. The actual shear stress due to the traffic load for 50 million standard axles was estimated using IITPAVE software and the respective interface shear strength was calculated from the experimental results to ensure that the interface shear strength can resist the actual shear stress. Laboratory and numerical test results unveiled that the IPB when laid on Zone II bedding sand packed by Zone II>>2.36 jointing sand exhibited better interface shear stress behaviour.

摘要

剪应力行为是影响互锁混凝土砌块路面性能的主要特征之一。本研究的主要目的是找出顺层砂和接缝砂对联锁摊铺机砌块 (IPB) 和顺层砂界面剪应力行为的影响。使用大规模直接剪切试验研究了剪切应力行为。该研究涉及三个等级的层理砂。PLAXIS软件用于模拟实验室测试结果，测试结果的准确性经过统计验证。为了避免繁琐的实验研究，使用 PLAXIS 软件进行了进一步的分析。使用数值模型分析了八个级配的接缝砂，以解释其对界面剪应力行为的影响。使用IITPAVE软件估算了5000万个标准车轴的交通荷载引起的实际剪应力，并根据实验结果计算出各自的界面剪切强度，以确保界面剪切强度能够抵抗实际的剪切应力。实验室和数值试验结果表明，IPB 铺设在由 II 区>>2.36 接缝砂填充的 II 区顺层砂上时表现出更好的界面剪切应力行为。