CAJ | 학술논문

大直径曲线盾构隧道中，盾构掘进时盾构对其两侧和拱顶上方的土体作用不同，不同位置土体表现出不同的变形规律。为了保证曲线盾构隧道施工安全进行，并针对变形的差异性提出相应的解决方案，采用现场监测和 FLAC 3D 数值模拟相结合的方法，对超大直径曲线盾构隧道施工中周边土体变形进行分析，监测项目包括地表沉降、分层沉降、土体深层水平位移。研究结果表明：1）随着隧道掘进，地表沉降呈现反“S”形变形趋势，与3个变形阶段对应，即盾构切口到达时缓慢隆沉，盾构通过时沉降较快，盾尾脱出时沉降趋于稳定；2）横向沉降槽曲线中，掘进时隧道掘进方向曲线内侧沉降量比外侧对称位置沉降更大；3）土体水平位移在隧道掘进方向曲线内侧变形量小于外侧变形量。
대직경곡선순구수도중，순구굴진시순구대기량측화공정상방적토체작용불동，불동위치토체표현출불동적변형규률。위료보증곡선순구수도시공안전진행，병침대변형적차이성제출상응적해결방안，채용현장감측화 FLAC 3D 수치모의상결합적방법，대초대직경곡선순구수도시공중주변토체변형진행분석，감측항목포괄지표침강、분층침강、토체심층수평위이。연구결과표명：1）수착수도굴진，지표침강정현반“S”형변형추세，여3개변형계단대응，즉순구절구도체시완만륭침，순구통과시침강교쾌，순미탈출시침강추우은정；2）횡향침강조곡선중，굴진시수도굴진방향곡선내측침강량비외측대칭위치침강경대；3）토체수평위이재수도굴진방향곡선내측변형량소우외측변형량。
The surrounding ground will be disturbed when a large diameter shield bores in curved section.In the paper, analysis is made on the influence of a super-large diameter shield tunneling on the surrounding environment by means of site monitoring and FLAC 3D numerical simulation,so as to guarantee the safety of the construction and to provide a solution for the deformation difference.The monitoring items include ground surface settlement,layered settlement and deep horizontal displacement of soil.The study results show that:1 )The ground surface settlement takes place in 3 stages,i.e.,when the cutting ring of the shield reaches,the rate of the ground surface settlement is low;when the shield passes,the rate of the ground surface settlement is high;when the shield tail passes,the rate of the ground surface settlement becomes stable;2)The ground surface settlement on the inner side of the curved tunnel section is larger than that on the outer side of the curved tunnel section;3)The horizontal displacement of ground on the inner side of the curved tunnel section is smaller than that on the outer side of the curved tunnel section.