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钢管混凝土支架作为一种新型支架形式,逐渐应用于地下工程支护中。通过理论分析、实验室试验和数值模拟分析支架在巷道支护中的力学性能。通过钢管混凝土轴压短柱极限承载力公式计算出短柱的极限承载能力为1 115.5 kN,大于空钢管和素混凝土短柱的极限承载力之和;在支架加载试验中,加载约束条件使支架受到长杆失稳的影响,同时支架各部分强度有差异,导致试验支架的极限荷载为短柱的1.35倍;在圆形支架支护巷道的数值模拟中,巷道围岩对支架四周加压,支架屈服荷载和极限荷载均超过短柱荷载值的2倍,同时支架发生塑性大变形,变形率接近9%。在巷道支护中钢管混凝土支架具有很高的承载能力,而且本身具备大变形让压的力学特性,适合在软岩巷道或者深井巷道支护中使用。
As a new type of support, the concrete-filled steel tubular support is gradually applied to the underground engineering support. Through theoretical analysis, laboratory tests and numerical simulation analysis of the mechanical properties of the support in roadway support. The ultimate bearing capacity of stub columns is calculated to be 115.5 kN, which is greater than the sum of the ultimate bearing capacity of hollow steel tube and plain concrete stubby the formula of ultimate bearing capacity of stub columns with axial compressive load. In the loading tests, Which is affected by the destabilization of the long shaft. At the same time, the strength of each part of the stent is different, resulting in the ultimate load of the test stent being 1.35 times that of the short column. In the numerical simulation of the round braced roadway, the surrounding rock of the roadway pressurizes the stent, The yield stress and the ultimate load of the stent all exceed twice the load value of the short column, and the plastic deformation of the stent occurs with the deformation rate approaching 9%. In the roadway support, the concrete-filled steel tube supports have high carrying capacity, and have the mechanical properties of large deformation to make them suitable for supporting in soft rock tunnels or deep tunnels.