Abstract: To solve the controlling problems of the large deformation after the initial tunneling in coal roadway nearby narrow pillar, combined with the basic understanding of dynamic and static abutment pressure, the evolution process of microcracks was researched through CT scanning. Then, the asymmetric support technology of parallel-arranged composed of double truss cables and single cable was put forward, and its composition structure, controlling mechanism and stress field distribution characteristics were researched systematically. The research results have shown that 1) The numbers, development speed and penetration speed of microcracks are asymmetric on both sides of coal roadway; 2) The stress field distribution characteristics in the roof and coal pillar could be described as batwing expansion along vertical direction, and more anchorage-body remains in a compression state in stress superposition areas. The parallel-arranged asymmetric support technology was successfully applied in roadway 120210 nearby narrow pillar. The deformations in the roof and coal sides are coordinated and the controlling effects are well. The research findings will have great theoretical and practical value to other projects with similar engineering geological conditions.

Key words: dynamic and static abutment pressure, CT scanning, double truss cable, asymmetric support, stress expansion