西宁曹家堡机场于1991年9月份建成。跑道磁方向为110°～290°。1996年经适航检查,发现跑道西调头坪和距跑道西头500-700米两处下沉。场区土基为Ⅲ级自重湿陷性黄土,道面结构为5cm改性沥青砼,结构层总厚度为90cm,其中西头调头坪下沉面积为1450平方米,其中最大下沉量为21厘米。距跑道西头500～700米处下沉面积为11850平方米,其中 Xining Caojiabao Airport was built in September 1991. The magnetic direction of the runway is 110 ° ~ 290 °. After airworthiness inspection in 1996, it was found that the first runway west of Taupeng and the second runway 500-700 meters from the sinkdown. The soil mass of the site area is grade Ⅲ self-weight collapsible loess, the pavement structure is 5cm modified asphalt concrete, and the total thickness of the structural layer is 90cm, of which the sinking area of ​​the west head is 1450m 2, of which the maximum subsidence is 21 cm. From the runway west 500 ~ 700 meters sinking area of ​​11850 square meters, of which