CAJ | 학술논문

针对目前浅埋暗挖软基隧道在分部开挖条件下支护结构拱脚受力进行专门理论计算分析的报道尚不多见的现状，基于Winkler弹性地基梁理论建立管棚超前支护和锁脚锚杆的力学模型，提出两者对支护结构竖向荷载的承载作用计算方法，并在此基础上推导拱脚地基荷载的计算公式，并进行实例计算分析。计算结果结合现场拱脚压力测试结果表明：提出的拱脚地基荷载计算方法可靠性良好，能够很好地解释地表过量沉降以及隧道中上部开挖步为位移控制关键步序的原因，提出浅埋暗挖软基隧道分部开挖时应重视对拱脚地基承载力进行验算，承载力不足时应采取措施，避免因此造成的隧道和地层整体沉降。
침대목전천매암알연기수도재분부개알조건하지호결구공각수력진행전문이론계산분석적보도상불다견적현상，기우Winkler탄성지기량이론건립관붕초전지호화쇄각묘간적역학모형，제출량자대지호결구수향하재적승재작용계산방법，병재차기출상추도공각지기하재적계산공식，병진행실례계산분석。계산결과결합현장공각압력측시결과표명：제출적공각지기하재계산방법가고성량호，능구흔호지해석지표과량침강이급수도중상부개알보위위이공제관건보서적원인，제출천매암알연기수도분부개알시응중시대공각지기승재력진행험산，승재력불족시응채취조시，피면인차조성적수도화지층정체침강。
In view of the fact that special theoretical analysis of the stress at the foot of supporting structure of shallow buried soft base tunnel with partial excavation is rarely reported, mechanical models and corresponding calculation method of vertical-load-bearing role of pipe-shed advance support and foot-locking bolt are established respectively based on the elastic theory of Winkle. Based on these, formulas of foundation load at the arch foot are obtained and applied in real calculation. Results of both calculation and field tests on arch foot pressure show that the proposed calculation method is reliable to calculate the load at the arch foot and helpful to explain the reason why excessive surface settlement takes place and why the upper-middle excavation step is the key to control displacement. It is recommended that the foundation capacity at the arch foot of shallow buried soft base tunnel should be checked when partial excavation is executed, and necessary measures be taken if the foundation capacity is not sufficient to avoid general settlement of the tunnel and the stratum.