Why is Keyuan Road in jiaozhou city so difficult to repair?

Road conditions. According to the introduction of Keyuan Road in jiaozhou city, it is difficult to repair the uneven asphalt pavement and subgrade water-stable layer in Keyuan Road in jiaozhou city. Jiaozhou city is a county-level city under the jurisdiction of Shandong Province, managed by Qingdao, located in the southeast of Shandong Peninsula, on the northwest coast of Jiaozhou Bay and the coast of the Yellow Sea, with a total area of 1324 square kilometers, connecting Chengyang District and Jimo District in the east, gaomi city and Zhucheng City in the west, Huangdao District in the south and Li Anping in the north.