Abstract: Based on the means of geological mechanic test, such as the investigation on the mineral composition of surrounding rock, the rock mechanics experiments in laboratory, the stress measurement in roadways and the tests of surrounding rock loose zone, the deformation failure mechanism in deep roadways is deeply revealed. Aimed at the supporting problem of low rock strength and the high stress in deep roadways in Zhaolou mine, we put forward the combined support system of “three anchors” which are known as anchor chain, anchor injection and anchor joint with the inside grouting bolt at the core. In order to reveal the deformation laws of surrounding rock and the loading conditions of supporting structure, the displacement of surrounding rock and axial force of rock bolt are monitored in real time. The monitoring result shows that the large displacement of surrounding rock and the heaving floor can be effectively controlled by the combined support system of “three anchors”, ensuring the long-term stability and safety of roadways.

Key words: roadways in deep, support, control of surrounding rock, monitor measuration