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对于大埋深巷道,在较小的锚杆预紧力作用下,软岩巷道围岩从固支梁结构破坏变形成为铰支梁结构的过程中,围岩因为发生位移而产生较大的变形。也就是说,锚杆支承作用的充分发挥是以牺牲围岩的变形量为代价的。因此,锚杆、锚索的预紧力对于维护软岩巷道的整体性至关重要。通过数值模拟再次证明了施加高预紧力对控制巷道围岩变形破坏的重要性。
For the large depth of the roadway, under the action of the small bolt preload, the surrounding rock of the soft rock roadway is deformed from the structure of the support beam to the structure of the hinged beam, and the surrounding rock is greatly deformed due to the displacement . In other words, the full play of bolt support at the expense of rock deformation at the expense of. Therefore, the pre-tightening force of anchor rod and anchor rope is very important to maintain the integrity of soft rock roadway. The importance of applying high pretightening force to the deformation and destruction of surrounding rock in roadway is proved again by numerical simulation.