Abstract：To nondestructively evaluate the semi-rigid base cracking condition, the falling weight deflectometer (FWD) was used as a platform to back calculate the base modulus, the difference in back-calculated modulus between basin matching algorithm and law algorithm was compared, and the correlation between back-calculated modulus and cracking condition of base was analyzed. Furthermore, the base modulus ratio was used as the evaluation indicator to develop the evaluation model and evaluation criteria for base cracking condition. The results show that, the visual damages of semi-rigid base after milling are mainly cracks. Compared with the basin matching algorithm, the solution obtained by the basin law algorithm shall be unique and the variability of the subgrade modulus is relatively low. The base modulus ratio has a good linear relationship with base cracking condition in the semi-logarithmic coordinates. The base cracking condition can be divided into four categories based on the boundary values of the base modulus ratio of 0.68, 0.47 and 0.30. The proposed model is applicable to the evaluation of the cracking condition of semi-rigid base with different stiffness, which can be referred when deciding whether to renovate the semi-rigid base in the pavement rehabilitation design.
臧国帅 孙立军. 基于FWD的半刚性基层开裂状况无损评价模型[J]. 土木工程学报, 2019, 52(1): 115-121.
Zang Guoshuai Sun Lijun. A nondestructive evaluation model based on FWD for semi-rigid base#br#
cracking condition. 土木工程学报, 2019, 52(1): 115-121.
