CAJ | 학술논문

目前城市地铁建设中往往容易遇到各种既有地铁结构，施工时必须确保这些既有地铁结构的安全。北京地铁六号线二期工程起点—物资学院站区间泵房采用冻结法下穿既有地铁结构，结合该工程系统地介绍了冻土帷幕结构的设计、水平冻结工艺，以及自然解冻和融沉注浆，并从冻结温度场变化及地表变形两方面探讨了冻结法下穿既有地铁结构的安全性。结果表明：冻结法下穿既有地铁结构关键在于冷冻体的成形质量；本工程施工中冷冻体温度稳定在－25℃以下，整个施工过程中的冻胀融沉量均控制在±6 mm以内，既保证了既有地铁结构的安全性，又最大程度减少了施工对周边环境的影响。
목전성시지철건설중왕왕용역우도각충기유지철결구，시공시필수학보저사기유지철결구적안전。북경지철륙호선이기공정기점—물자학원참구간빙방채용동결법하천기유지철결구，결합해공정계통지개소료동토유막결구적설계、수평동결공예，이급자연해동화융침주장，병종동결온도장변화급지표변형량방면탐토료동결법하천기유지철결구적안전성。결과표명：동결법하천기유지철결구관건재우냉동체적성형질량；본공정시공중냉동체온도은정재－25℃이하，정개시공과정중적동창융침량균공제재±6 mm이내，기보증료기유지철결구적안전성，우최대정도감소료시공대주변배경적영향。
T here are various existing metro structures of urban subway construction,the safety of which must be ensured during the construction. M aterial Institute interval pumping station which is the Beijing subway line six PhaseⅡ starting point runs beneath the existing subway structure by using freezing method. Based on this project,this paper systematically introduced the design of frozen soil curtain structure,level freezing technology,natural thawing and thaw settlement grouting,and discussed the safety of running beneath the existing subway structure with freezing method from such aspects as freezing temperature field change and surface deformation. T he results showed that the key of running beneath the existing subway structure with freezing method is the forming quality of the frozen soil, the frozen soil temperature is below 25 ℃ and the frost heave thawing settlement amount is within ± 6 mm during construction,which could ensure the existing metro structure safety and minimize the effect of construction on the surrounding environment.