深井软岩巷道钢管混凝土支护结构性能试验及应用

 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f140 mm×4.5 mm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1 504.1 kN，纵向极限压缩变形为82.65 mm，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。

TEST ON STRUCTURAL PROPERTY AND APPLICATION OF CONCRETE-FILLED STEEL TUBE SUPPORT OF DEEP MINE AND SOFT ROCK ROADWAY

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 f140 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.