CAJ | 학술논문

依托西安市南门隧道上穿近接地铁2号线区间隧道工程，采用 Midas GTS 建立数值计算模型，计算分析了5种不同工况下各施工阶段及施工完成阶段下的基坑变形和地铁管片变形。计算结果表明：在原状土不采用旋喷加固处理的情况下，基坑最大隆起变形值为11．3 cm，地铁管片最大隆起变形值为5．8 cm，均大大超出了变形限值；采用随挖随填施工的情况下，基坑隆起变形有一定减少，沉降变形有一定增加，但变形值均超出变形限值；在对原状土进行旋喷加固及采用抗拔桩措施的情况下，基坑及管片变形值均大幅降低，且小于变形限值。研究结果可为明挖基坑上穿既有地铁隧道变形计算提供有益参考。
의탁서안시남문수도상천근접지철2호선구간수도공정，채용 Midas GTS 건립수치계산모형，계산분석료5충불동공황하각시공계단급시공완성계단하적기갱변형화지철관편변형。계산결과표명：재원상토불채용선분가고처리적정황하，기갱최대륭기변형치위11．3 cm，지철관편최대륭기변형치위5．8 cm，균대대초출료변형한치；채용수알수전시공적정황하，기갱륭기변형유일정감소，침강변형유일정증가，단변형치균초출변형한치；재대원상토진행선분가고급채용항발장조시적정황하，기갱급관편변형치균대폭강저，차소우변형한치。연구결과가위명알기갱상천기유지철수도변형계산제공유익삼고。
Rely on the Xi’an Nanmen tunnel adjacent upper crossed line No.2 metro section,the Midas GTS numerical model was applied to analyze the foundation pit and tunnel segment’s deformation on construction stage and completion stage in five conditions.The calculated results shows that:the maximum uplift deformation of foundation pit is 11 .3 cm and the maximum uplift deformation of tunnel segment is 5.8 cm without circle spray reinforcement;In cut-and-cover construction condition,foundation pit’s uplift deformation is decreased and settlement deformation is increased to a certain degree,and the deformation values are exceeded the limited values;In circle spray reinforcement and uplift pile measures,the deformations values of foundation pit and tun-nel segment are dramatically decreased and below the limited values.The research results can provide a good reference to calculate the deformation of existing tunnels overlapped by open excavated foundation pit.