锚杆对隧道衬砌工后应力及位移的影响研究

为了研究流变后锚杆对衬砌的应力、位移的控制，采用Ｂｕｒｇｅｒｓ模型的松弛剪切模量Ｐｒｏｎｙ级数形式，确定其在ＡＢＡＱＵＳ中粘弹性本构输入参数，使用ＡＢＡＱＵＳ对某五心圆隧道进行了不同锚杆支护下围岩流变后衬砌应力及位移的数值模拟及系统分析。结果表明锚杆支护对衬砌应力增长有明显的控制，可使衬砌应力比无锚杆支护时减小２４．３１％，但是对位移增长控制并不明显，仅减小１．３０％。在Ｖ级围岩中，锚杆长度在４ｍ以内时，增大锚杆长度可以有效地改善锚固效果，为考虑岩石流变情况下的围岩锚固研究提供了参考。

Research on Effect of Bolt on Stress and Displacement of Tunnel Lining after Construction

In order to investigate the controlling effect of bolt on the stress and displacement of the lining after long-term rock rheology, the shear modulus of relaxation in Prony series form of Burgers model is used to determine the input pa- rameters of ABAQUS viscoelastic model, and ABAQUS is adopted to make the numerical simulation and systematical analysis of the stress and displacement of the lining of different bolt support after rock rheology. The research results show that the bolts can obviously control the stress increase of the lining. This stress is reduced by 24.31% on average com- pared to that without bolt supports. However, it is not obvious for displacement control that the stress is reduced by only 1.30 % on average. The reinforcement effect may be improved and enhanced by increasing the bolt length within 4 meters in surrounding rock grade V, which could provide some references for the research of the surrounding rock anchorage un- der considering the rock rheology.