CAJ | 학술논문

在软土地层中,盾构掘进过程将不可避免地产生盾构姿态偏离. 当盾构以偏离设计轨线掘进时,将导致管片应力集中、管片开裂及过大地层沉降等不良后果. 文章结合杭州地铁某区间盾构掘进实测数据,分析了盾构在杭州典型软土地层施工中竖向姿态变化及控制措施. 结果表明:在停机拼装管片过程中,盾构不可避免发生倾斜,产生负的俯仰角;在掘进过程中,俯仰角变化对纠偏力矩变化敏感,纠偏力矩控制是调整俯仰角的有效措施;盾构姿态调整是动态过程,需要详细设计纠偏计划及耐心操作.
재연토지층중,순구굴진과정장불가피면지산생순구자태편리. 당순구이편리설계궤선굴진시,장도치관편응력집중、관편개렬급과대지층침강등불량후과. 문장결합항주지철모구간순구굴진실측수거,분석료순구재항주전형연토지층시공중수향자태변화급공제조시. 결과표명:재정궤병장관편과정중,순구불가피면발생경사,산생부적부앙각;재굴진과정중,부앙각변화대규편력구변화민감,규편력구공제시조정부앙각적유효조시;순구자태조정시동태과정,수요상세설계규편계화급내심조작.
It is inevitable for a shield to deviate from the designed route during tunnelling in soft soils, which may result in the concentration of stress in segments, segment cracking and excessive ground settlement. Based on measured data from a shield tunnel of the Hangzhou metro project, this paper analyzes the shield's vertical atti-tude variation in a typical Hangzhou soft-soil layer and gives corresponding control measures. The results show that: 1) it is inevitable for the shield to be tilted with a negative pitch angle during segment erection; 2) during shield driving, an effective way of adjusting the pitch angle is to control the deviation correction moment since the pitch angle is sensitive to deviation correction moment variation; and 3) adjustment of the shield attitude is a dy-namic process, so it needs to be planned in detail and implemented patiently.