【摘要】 深井软岩及动压巷道支护难度大,传统的支护方式已难以满足需要。为此研发钢管混凝土支架,在实验室测试支架的力学性能,试验支架采用φ140mm×4.5mm钢管和C40混凝土,由4段构成,接头采用套管连接。在侧向约束、纵向点载荷加压条件下,试验支架的极限承载力为1504.1kN,纵向极限压缩变形为82.65mm,破坏方式为钢管材料屈服破坏。与U型钢支架相比,钢管混凝土支架支护反力大、性价比优越。钢管混凝土支架在煤矿井下巷道支护应用效果良好,有着广泛的推广应用前景。更多还原

【Abstract】 Traditional supports are difficult to maintain the route work of roadway in deep well due to dynamic pressure propagation within soft rock.To tackle this problem,concrete-filled steel tube support is developed;and further the mechanical properties of the support are tested in laboratory.The experimental supports are composed by four sections of φ140 mm×4.5 mm steel tube,with concrete C40,and joints with casing linkage.Under the conditions of lateral constraint and vertical point load pressure,the ultimate bearing capacity of experimental support is about 1 504.1 kN;and the vertical ultimate compressive deformation reaches 82.65 mm,resulting in failure mode of steel tube.Compared with the U-shaped steel support,concrete-filled steel tube support holds not only high supporting capacity,but also with a competitive price.So concrete-filled steel tube structure may have an extensive application to coal mine roadway.更多还原