一、前言 混凝土或岩石的抗压强度很高,但其抗拉强度很低。如果通过用抗拉强度高的钢丝绳对混凝土或岩石来施加预应力,则由工作载荷传递来的拉伸应力因得到钢丝绳的补偿而达到平衡。 把这种机理用到井下支护系统中去,在设计与施工方面应用,就能在经济上受益。在锚杆使用上,如果我们能利用抗拉强度高的钢丝绳防止或遏制岩石沿着横向岩体不连续面发生的移动,岩体就能保持其原来剪切强度,并具有相当大的“自承”能力;此外,还可减少由于长期风化侵蚀对开张性不连续岩体强度的潜在破坏。 First, the preface Concrete or rock compressive strength is high, but its tensile strength is very low. If the concrete or rock is prestressed by a steel wire rope with high tensile strength, the tensile stress transmitted by the work load is balanced by the wire rope compensation. Applying this mechanism to the subsurface support system can benefit economically if it is applied in design and construction. In the use of anchor, if we can use the high tensile strength of the rope to prevent or stop the rock along the lateral discontinuities of rock mass movement, the rock will be able to maintain its original shear strength, and has a considerable " In addition, the potential damage to the strength of open discontinuous rock mass due to long-term weathering erosion can also be reduced.