CAJ | 학술논문

针对黄土地区基坑开挖对下伏既有盾构隧道影响及其安全评价，采用有限差分法数值软件，结合实际场地的水文地质和工程地质条件，建立三维数值模型，进行施工过程的数值模拟与既有线路安全评价。研究结果表明，基坑群开挖对盾构下伏既有隧道影响较大，基坑构筑物施作时既有隧道变形减小，基坑群采用不同步开挖将有利于减小对下伏既有隧道的影响，并针对不同施工阶段的既有盾构隧道变形进行安全评价分析，认为这种工法与加固措施满足既有盾构隧道变形控制要求。
침대황토지구기갱개알대하복기유순구수도영향급기안전평개，채용유한차분법수치연건，결합실제장지적수문지질화공정지질조건，건립삼유수치모형，진행시공과정적수치모의여기유선로안전평개。연구결과표명，기갱군개알대순구하복기유수도영향교대，기갱구축물시작시기유수도변형감소，기갱군채용불동보개알장유리우감소대하복기유수도적영향，병침대불동시공계단적기유순구수도변형진행안전평개분석，인위저충공법여가고조시만족기유순구수도변형공제요구。
Regarding to the influence of foundation pit excavation on the adjacent existing shield tunnel and its safety e-valuation ,a finite differential software was adopted to establish a three -dimensional numerical model based on the in situ hydrogeological and engineering geological condition .And then the numerical simulation of the construction process and the exiting route safety evaluation were obtained through the model .The results indicate that foundation pit excavation has great impact on the adjacent existing shield tunnel ;deformation of the tunnel becomes smaller during the construction of the foundation pit structure ;when the excavation of the foundation pit group is carried out out of synchronization ,it is beneficial to reducing the effect on the existing shield tunnel ;the construction method and reinforcement measure are con-sidered competent for the deformation control according to the safety analysis and evaluation of the tunnel deformation in different stages of the construction .