某机场道面脱空原因与处治措施

某机场位于河床一级阶地和高漫滩上，2000年初发现道面脱空，近年来又加速了发展趋势，不仅对道面安全使用造成严重威胁，还缩短了道面寿命。经试验分析确定该机场道面是由于饱水的砂砾石基层和粉土地基在飞机反复的冲击荷载作用下，孔隙水压力、地下水位反复升降，潜蚀作用带走细粒物质而使道面脱空。近年来重型飞机的频繁起降，振动荷载作用加剧，使砂土发生液化，潜蚀作用进一步增强，脱空现象加剧。结合现场试验，采用灌浆方法进行处理，经检测效果良好。

Genesis Analysis of Foundation Void under an Airport Runway and Its Treatment

A foundation void was first found in 2000 in an airport that located in the first terrace and floodplain and its expanding tendency is accelerating in recent year,which not only threatens the safe use of runway,but also shortens its life.Through test analysis,the foundation void is confirmed to be formed in such manner that the water-soaked sand gravel base and silt foundation is repeatedly affected by the impact load of airplanes,the pore water pressure and the underground water level is repeatedly increased and decreased,and the tiny particles in the deposit have been gradually taken away by the seepage erosion of groundwater.Recently,frequent takeoff and landing of heavy airplane aggravates vibrating load and liquefies sandy soil so that the underground erosion is further increased and the void is intensified.By the field test,the grouting method is used to treat the void and the recent examination implies that the reinforcement method is valid.