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| TEST ON STRUCTURAL PROPERTY AND APPLICATION OF CONCRETE-FILLED STEEL TUBE SUPPORT OF DEEP MINE AND SOFT ROCK ROADWAY |
| GAO Yanfa1，2，WANG Bo1，2，WANG Jun1，2，LI Bing1，2，XING Fei1，2，WANG Zhonggang3，JIN Tongle3 |
(1. China University of Mining and Technology，Beijing 100083，China；2. State Key Laboratory for Geomechnics and Deep Underground Engineering，China University of Mining and Technology，Beijing 100083，China；3. Key Laboratory of the
Ministry of Education for Structural Engineering and Vibration，Tsinghua University，Beijing 100084，China) |
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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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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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