Experimental Study on High Performance Concrete of Ultra-Deep Mines on the Coast of Eastern China

Abstract To solve the problem of ultra-deep mines on the coast of eastern China under the complex external environment of "high in-situ stress, high osmotic pressure, and strong corrosion", the high-performance concrete shaft wall structure with “high strength and low impact liability” was proposed. The field test study of the high-performance concrete shaft lining was carried out in-1120m ingate and-1114m to-1124m shaft in Sha-ling Gold Mine, and its stress and deformation were monitored and analyzed. Finally, according to the Von-Mises strength criterion and the thick-walled cylinder theory, the calculation formula of bearing capacity of HPC shaft wall was deduced. The results showed that: (1) On the 5th day after in-situ casting, the stress of high-performance concrete tends to be stable. Compared with ordinary concrete, high-performance concrete showed good early strength (2) The high-performance concrete shaft lining strain changes smoothly, and concrete strain can be divided into three stages: rapid growth stage, slow growth stage, and stable stage. (3) Under the external environment of "high in-situ stress, high osmotic pressure, and strong corrosion", the − 1120m ingate and − 1114m~-1124m shaft lining of Sha-ling Gold Mine supported by high-performance concrete had uniform stress and good mechanical properties, which can provide a reference for similar engineering support design.