路基工程
路基工程
로기공정
SUBGRADE ENGINEERING
2012年
1期
181-184,187
,共5页
机场道面%脱空%渗透%液化%灌浆
機場道麵%脫空%滲透%液化%灌漿
궤장도면%탈공%삼투%액화%관장
airport runway%foundation void%seepage%liquefaction%grouting
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。
某機場位于河床一級階地和高漫灘上,2000年初髮現道麵脫空,近年來又加速瞭髮展趨勢,不僅對道麵安全使用造成嚴重威脅,還縮短瞭道麵壽命。經試驗分析確定該機場道麵是由于飽水的砂礫石基層和粉土地基在飛機反複的遲擊荷載作用下,孔隙水壓力、地下水位反複升降,潛蝕作用帶走細粒物質而使道麵脫空。近年來重型飛機的頻繁起降,振動荷載作用加劇,使砂土髮生液化,潛蝕作用進一步增彊,脫空現象加劇。結閤現場試驗,採用灌漿方法進行處理,經檢測效果良好。
모궤장위우하상일급계지화고만탄상,2000년초발현도면탈공,근년래우가속료발전추세,불부대도면안전사용조성엄중위협,환축단료도면수명。경시험분석학정해궤장도면시유우포수적사력석기층화분토지기재비궤반복적충격하재작용하,공극수압력、지하수위반복승강,잠식작용대주세립물질이사도면탈공。근년래중형비궤적빈번기강,진동하재작용가극,사사토발생액화,잠식작용진일보증강,탈공현상가극。결합현장시험,채용관장방법진행처리,경검측효과량호。
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.