“对抗”还是“屈让”?——围岩挤压性大变形处治的基本理念

“Resistance”or“Yielding”?Discussion on the Basic Concept for Dealing with Rock Squeezing Problems

文章在对高地应力软弱围岩的挤压性机理进行探讨的基础上,着重论述了处治挤压性大变形的“屈让”理念以及与此相关的“恒阻释放”技术;同时,对无张拉锚杆和预应力锚索两种不同岩体锚固措施控制围岩挤压性变形的作用进行了分析和比较。此外,文中还讨论了采用充填高变形材料的离壁式衬砌,缓解残余形变压力荷载,克服“等待”二次衬砌施作时机的困难。

Based on the analysis of squeezing of weak rock under high in situ pressure,as a basic concept for dealing with squeezing problem,the“yielding principle”is pointed out in the paper,and relevant techniques for deformation releasing under a constant resistance are introduced moreover.Meanwhile the function difference between prestress anchorage cables and untensioned rock bolts are discussed and appraised.In other hand,for dealing with residual deformation,a suggestion is to arrange high deformation(compressible)fillings between the primary support and the extrados of the second lining in order to flexibly choose the timing of the second lining.