CAJ | 학술논문

隧道断面内临时格栅或型钢支撑的拆除,会打破结构系统原有的平衡.特别是在大断面浅埋隧道中,如果临时支撑拆除方式和时机不当,会造成初期支护变形过大或局部内力超过承载极限而发生安全事故. 文章以某土岩复合地层中大跨度浅埋暗挖车站为例,通过建立三维模型,主要模拟了拱盖法施工的大断面隧道纵向撑拆过程,分析了不同拆撑顺序以及单次拆撑长度对隧道结构的影响. 分析结果表明,选择交替拆撑顺序和单次6m的拆撑长度,对拱顶沉降和地表沉降等周边环境的影响相对较小,施工更为安全. 最后根据数值计算结果提出了拆撑引起成地表沉降控制标准的建议值,为以后类似工程提供参考.
수도단면내림시격책혹형강지탱적탁제,회타파결구계통원유적평형.특별시재대단면천매수도중,여과림시지탱탁제방식화시궤불당,회조성초기지호변형과대혹국부내력초과승재겁한이발생안전사고. 문장이모토암복합지층중대과도천매암알차참위례,통과건립삼유모형,주요모의료공개법시공적대단면수도종향탱탁과정,분석료불동탁탱순서이급단차탁탱장도대수도결구적영향. 분석결과표명,선택교체탁탱순서화단차6m적탁탱장도,대공정침강화지표침강등주변배경적영향상대교소,시공경위안전. 최후근거수치계산결과제출료탁탱인기성지표침강공제표준적건의치,위이후유사공정제공삼고.
In tunnel construction, dismantling the temporary strut or steel support will break the original balance of the structural system, especially in shallow tunnels with large sections, which may cause a safety accident by excessive deformation of the primary support or the local overloaded internal force if dismantling of the temporary support is performed in an improper way and at an improper time. A large-span shallow bored subway station in a soil-rock compound stratum is used as an example in this paper to simulate the process of dismantling the lon-gitudinal temporary support in a large-section tunnel by a 3D model, and the effects of different dismantling se-quences and one-time demolition lengths on the tunnel structure are analyzed. The analysis results show that the effect of alternating the dismantling sequence and the one-time demolition length of 6 m on factors such as crown settlement and surface subsidence is comparatively small. Additionally, a recommended value for controlling stan-dards of surface subsidence induced by dismantling is presented on the basis of numerical calculations, providing a reference to similar projects.