Support technology of high pressure hydraulic shotcrete and its application in tunnel engineering

Shotcrete technology is one of the necessary part of support system in tunnel engineering, and the support effect of shotcrete is getting more and more attention. We improve the materials and technologies and propose a new shotcrete supporting method, high pressure hydraulic shotcrete. The high pressure hydraulic parameters of C20, C25 and C30 concrete is studied. Several key factors and problems of the parameters are expounded. The engineering application shows that, compared with ordinary shotcrete technology, high pressure hydraulic shotcrete can effectively reduce the shotcrete resilience and the content of dust, and the later strength loss of shotcrete is less than 10%, which has a good popularization and application value.