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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 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.
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Received: 23 January 2009
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