CAJ | 학술논문

基于紧邻地铁车站及区间箱型隧道的昆明某超大型半圆内支撑深基坑工程，结合现场实测数据，对深基坑开挖过程进行仿真数值模拟；在此基础上研究紧邻地铁半圆内支撑深基坑受力及变形特性。研究结果表明：①超大型半圆内支撑体系有效地限制了地下连续墙的侧移，该设计方案成功、合理，可为昆明地区类似基坑设计提供借鉴；②半圆内支撑体系在圆弧端点处剪力、弯矩较大，需加强此处的支护结构；③半圆内支撑体系在圆弧拱顶处侧向位移较大，设置对称可有效地控制其变形；④侧方地铁结构对地下连续墙的侧向位移具有抑制效应，且抑制效应随距离的增大快速衰减，在基坑设计时可考虑此效应并结合地铁保护要求及基坑安全等级要求得到最佳方案。
기우긴린지철차참급구간상형수도적곤명모초대형반원내지탱심기갱공정，결합현장실측수거，대심기갱개알과정진행방진수치모의；재차기출상연구긴린지철반원내지탱심기갱수력급변형특성。연구결과표명：①초대형반원내지탱체계유효지한제료지하련속장적측이，해설계방안성공、합리，가위곤명지구유사기갱설계제공차감；②반원내지탱체계재원호단점처전력、만구교대，수가강차처적지호결구；③반원내지탱체계재원호공정처측향위이교대，설치대칭가유효지공제기변형；④측방지철결구대지하련속장적측향위이구유억제효응，차억제효응수거리적증대쾌속쇠감，재기갱설계시가고필차효응병결합지철보호요구급기갱안전등급요구득도최가방안。
Based on a super large foundation pit in Kunming with semicircle inner support adjacent to the exist-ing metro station and running tunnel and with reference to field data, numerical simulation was applied to simulate the construction process.On this basis, pressure and deformation characteristics of foundation pit were studied.The results show that:①super large semicircle inner supporting system inhibit lateral displacement of diaphragm wall effectively.The design plan of foundation pit is successful and reasonable, and can provide reference for design plan of similar foundation pit in Kunming.②the shearing force and bending moment of arc extreme point of semi-circle inner supporting system is bigger, and the supporting structure of arc extreme point is needed to strength-ened.③lateral displacement of arc vault of semicircle inner supporting system is bigger, and setting up symmetric supporting system can effectively control the deformation.④lateral subway structures have inhibitory effect on lat-eral displacement of diaphragm wall, and its inhibitory effect decays rapidly with the increase of distance.In the design of foundation pit, the effect should be considered, and protection requirements of metro and deformation re-quirements of foundation pit should also be considered in order to get an optimum scheme.