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对于深埋、软弱矿山巷道,可缩性金属支架是常用的支护形式,以适应围岩发生较大变形及其压力。针对封闭式可缩性金属支架,考虑在较大荷载作用下或围岩产生较大变形情况下支架节产生缩动时,进行其内力的计算。实际上,地下结构为超静定结构,支架缩动为非可逆过程,且缩动后支架形状会产生变化、卡缆将限制支架变形,这些都将使支架产生残余内力。通过计算支架的缩动残余内力、卡缆作用残余内力和荷载作用内力,并相叠加,进而获得支架缩动后支架的真实内力,从而为可缩性支架的设计计算提供依据。
For deep buried and weak mine roadways, retractable metal brackets are commonly used as support forms to accommodate large deformation and pressure of surrounding rock. In the case of closed shrinkable metal brackets, the calculation of internal forces is taken into account when the scaffold segments are under the condition of large load or large deformation of surrounding rock. In fact, the underground structure is statically indeterminate, and the stent is retracted to a non-reversible process. After the stent is retracted, the shape of the stent will be changed. The cable will limit the deformation of the stent, which will cause the residual internal force of the stent. The residual internal force of scaffold, the residual internal force of cable and the internal force of load acting on the cable are calculated and then superimposed to obtain the real internal force of scaffolding after scaffold, so as to provide the basis for the design and calculation of retractable scaffold.