中文摘要：

沥青路面动态应变测试是掌握结构内部真实受力状态的有效手段．与单点单一方向应变测试方法不同，文中设计了沥青路面三向应变的测试方法，并给出了光纤光栅应变传感器的现场布设工艺，最后对不同荷载条件下的动态应变现场实测结果进行了初步分析．结果表明：沥青路面现场三向应变测试提供的信息丰富，从测试结果中能够看出沥青路面具有粘弹特性；不同荷载条件作用下，路面结构的应变响应具有显著的差别，基本随着车辆速度的增大而减小．文中最后给出了沥青路面应变现场测试的建议及进一步的研究方向．

英文摘要：

The measurement of dynamic strain of asphalt pavement helps to effectively reveal the real mechanical state within the pavement structure. In this paper, a three-direction strain measurement method at a single testing point, which is different from the traditional unilateral measurement at a single point, is proposed. Then, the in-situ layout scheme for Fiber Bragg Grating （FBG） strain sensors is presented, and the measured three-direction dyna- mic strain in different loading conditions are compared and analyzed. The results show that the three-direction strain measurement provides more useful information about the observable viscoelastic characteristics of asphalt pavement, and that the strain response of pavement varying with loading conditions basically decreases with the increase of vehicle speed. Some suggestions for the field strain measurement and its further development are finally offered in this paper.