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《Coal Science and Technology》 2014-07
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L Type Borehole Ground Grouting Reinforcement Technology of Surrounding Rock in Deep Mine Roadway

YUAN Hui;DENG Jun;PU Chao-yang;AN Xu-liang;CHENG Zhen-fu;CHEN Yuan-kun;ZHOU Wei-jin;WANG Cong-ping;HUANG Jian;Beijing China Coal Mine Engineering Corporation Limited;State Engineering Lab of Deep Mine Construction Technology;Huaibei Coal Mining Group Corporation Limited;  
In order to improve the stability of surrounding rock and the security of supporting system in deep mine roadways,the directional drilling L type borehole for the ground pre-grouting reinforcement was proposed. The key technologies inclued drilling L type borehole technology,sealing technology of horizontal drilling,matching new reinforcing grout liquid and so on. The drilling equipment,inclinometer directional equipment and quality control of drilling mud with L type borehole technology were detailedly introduced. The central pumping station and electric power station of Xinhu Mine shaft bottom were grouted. The distance of horizontal grouting reinforcement achieved 200m when vertical depth was 999 m. The results showed that the range of single-hole grouting and grouting effect on the basis of a small amount of the number of ground pre-grouting holes was substantially increased. The grouting volume reached 1 459 m3in building up section,grouting volume reached 955. 5 m3in horizontal drilling section. The stability of surrounding rock of deep mine roadways could be ensured.
【Fund】: 国家高技术研究发展计划(863计划)资助项目(2012AA06A401)
【CateGory Index】: TD265.4;TD353
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