CAJ | 학술논문

大断面隧道穿越地势起伏的地层环境时,地层偏压情况往往不同,在不同的偏压情况下选择合理的施工方法对控制大断面隧道施工力学性能具有重要意义。通过对双侧壁导坑法、改进台阶法、交叉中隔壁（CRD）法的数值模拟,分析不同偏压情况下的大断面浅埋隧道施工中的位移控制效果与支护承载情况。结果表明：当地表倾角为0～10°时,宜采用改进台阶法;当地表倾角为10～20°时,优先选择改进台阶法,同时应加强支护并及时监测;当地表倾角为20～30°时,宜采用双侧壁导坑法。
대단면수도천월지세기복적지층배경시,지층편압정황왕왕불동,재불동적편압정황하선택합리적시공방법대공제대단면수도시공역학성능구유중요의의。통과대쌍측벽도갱법、개진태계법、교차중격벽（CRD）법적수치모의,분석불동편압정황하적대단면천매수도시공중적위이공제효과여지호승재정황。결과표명：당지표경각위0～10°시,의채용개진태계법;당지표경각위10～20°시,우선선택개진태계법,동시응가강지호병급시감측;당지표경각위20～30°시,의채용쌍측벽도갱법。
When large cross-section tunnels run through ground with uneven terrain, different asymmetrical earth pres- sures are always encountered. Therefore, selecting rational construction methods is very important for the control of the construction mechanical performance of asymmetrical-loaded large cross-section tunnels under shallow cover. In the pa- per, analysis is made on the displacement control and support stress of asymmetrical-loaded large cross-section tunnels under shallow cover, by means of numerical simulating on double side drift method, optimized bench method and CRD method. The results show that ： 1 ） When the ground surface inclination angle ranges from 0° to 10°~, optimized bench method should be adopted ; 2） When the ground surface inclination angle ranges from 10° to 20°, optimized bench method should be adopted and the support should be strengthened and timely monitoring should be executed; 3） When the ground surface inclination angle ranges from 20° to 30°, double side drift method should be adopted.