Combined Support Technology of Large Section Roadway in High-stress Fractured Surrounding Rock

摘要

High-stress fractured surrounding rock roadway occupies a large proportion in mining roadways. In the high-stress fractured surrounding rock roadway, the main reason of roadway's instability and damage is the structural instability of support. How to improve the structural stability of support and the carrying capacity is very important for resolving the problem of high-stress fractured surrounding rock roadway bolt support. The paper is based on invalid principle of bolt support of high-stress fractured surrounding rock roadway. Aiming at the features of roadway damage, the paper proposes that the combined support technology of active support and passive support be adopted to solve the problem of high-stress fractured surrounding rock roadway through theory analysis. The primary support is the active support of cable anchor and gunite. The secondary support is the combined technology which is aided by closed bracket of double-deck I-beam combination to fill wall and grout surrounding rock of shallow roadway. Test at the underground reveals that the combined support technology can greatly improve the carrying capability of the shallow and deep surrounding rock so that it can satisfy the long-term stability of high-stress fractured surrounding rock roadway and reduce maintenance costs of mining roadway. Therefore it has significant economic benefit and extensive application prospect.