| The excavating secondary stresses coupling with underground stresses and theirshowing effects in the kilometer deep tunnels of Zhuji Coal Mine of Huainan MiningGroup are studied in this dissertation. Through the test measuring mechanics propertiesof tunnel around rock disturbing with excavating actions, the mould experiments andsimulating analysis of mutual affects for near tunnel excavations and combined withthe field monitoring for the support deformations of existing rock tunnel subjected tonear tunnel excavating, the degradation amounts of mechanics properties of tunnelaround rock suffering with all excavating secondary stress actions are obtained, theaffecting relations of different excavating positions of deep mine tunnels withexcavating secondary stress coupling appearances are shown, and the effect amounts ofthe supporting deformations of existing roof rock tunnel subjected to excavatingsecondary stresses of down coal roadway are achieved in this paper. Through fieldapplication experiments the available supporting ways to treat with excavatingsecondary stress coupling actions are proposed, which is the unite proposal ofconsolidating leg supports of steel arch with anchoring and spraying as well asinjecting concrete. The research results will have the important theoreticalsignificances for understanding the excavating secondary stress effects of deep minetunnels and have application worthiness for reasonable designing supporting treatways. |
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