CAJ | 학술논문

对岩锚吊车梁的设计一般基于刚体极限平衡法，该方法忽略岩壁的自身变形，也不考虑后续开挖变形的影响。而锦屏一级水电站地下厂房厂区地应力水平高，地应力最大值达35.7 MPa，地应力释放必然对岩锚吊车梁的变形及应力造成极大的影响。结合现场实测变形资料，采用三维非线性有限元法对地下厂房岩锚吊车梁进行研究，计算各开挖阶段吊车梁自身的变形及应力。结果表明，在锦屏一级地下厂房高地应力场中，会产生大范围失稳破坏和拉杆屈服现象。揭示了分级开挖所致洞壁变位对拉压杆内力的影响机制和内力变化规律。研究发现，适当推迟拉压杆注浆锁固时间，使得岩锚梁拉压杆在洞壁发生一定变位后再与围岩共同变形，可以有效降低后续开挖导致的拉压杆内力。
대암묘조차량적설계일반기우강체겁한평형법，해방법홀략암벽적자신변형，야불고필후속개알변형적영향。이금병일급수전참지하엄방엄구지응력수평고，지응력최대치체35.7 MPa，지응력석방필연대암묘조차량적변형급응력조성겁대적영향。결합현장실측변형자료，채용삼유비선성유한원법대지하엄방암묘조차량진행연구，계산각개알계단조차량자신적변형급응력。결과표명，재금병일급지하엄방고지응력장중，회산생대범위실은파배화랍간굴복현상。게시료분급개알소치동벽변위대랍압간내력적영향궤제화내력변화규률。연구발현，괄당추지랍압간주장쇄고시간，사득암묘량랍압간재동벽발생일정변위후재여위암공동변형，가이유효강저후속개알도치적랍압간내력。
The rigid body limit equilibrium method is often used to design rock-anchored beam,but the follow-up excavation and rock deformation are not taken into account in this method. Underground power house of Jinping I hydropower station is located in the region with high underground stress(maximum value reaches 35.7 MPa). The stage excavation of the underground plant certainly has significant effect on the deformation and stress of rock-anchored beam. Compared with field monitoring deformation,3D nonlinear finite element method is used to study deformation and stress of rock-anchored beam of underground power house. The deformation and stress of rock-anchored beam are analyzed under each excavation stage. The results show that during excavation,a large scope of unstable failure and a pull rod yielding phenomenon will happen. The influencing mechanism of successive excavation to pull rod stress,and the stress variation behavior of pull rod are discussed. It is found that delaying of the fixing time of rock rod can effectively reduce the pull rod stress caused by following excavation.